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circuitpython/py/objfun.c
Paul Sokolovsky caa7334141 stackctrl: Add "mp_" prefix.
2014-07-01 02:14:08 +03:00

606 lines
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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2014 Paul Sokolovsky
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdbool.h>
#include <string.h>
#include <assert.h>
#include "mpconfig.h"
#include "nlr.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "objtuple.h"
#include "objfun.h"
#include "runtime0.h"
#include "runtime.h"
#include "bc.h"
#include "stackctrl.h"
#if 0 // print debugging info
#define DEBUG_PRINT (1)
#else // don't print debugging info
#define DEBUG_printf(...) (void)0
#endif
/******************************************************************************/
/* native functions */
// mp_obj_fun_native_t defined in obj.h
STATIC mp_obj_t fun_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
switch (op) {
case MP_BINARY_OP_EQUAL:
// These objects can be equal only if it's the same underlying structure,
// we don't even need to check for 2nd arg type.
return MP_BOOL(lhs_in == rhs_in);
}
return MP_OBJ_NULL; // op not supported
}
STATIC mp_obj_t fun_native_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_fun_native));
mp_obj_fun_native_t *self = self_in;
// check number of arguments
mp_arg_check_num(n_args, n_kw, self->n_args_min, self->n_args_max, self->is_kw);
if (self->is_kw) {
// function allows keywords
// we create a map directly from the given args array
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
return ((mp_fun_kw_t)self->fun)(n_args, args, &kw_args);
} else if (self->n_args_min <= 3 && self->n_args_min == self->n_args_max) {
// function requires a fixed number of arguments
// dispatch function call
switch (self->n_args_min) {
case 0:
return ((mp_fun_0_t)self->fun)();
case 1:
return ((mp_fun_1_t)self->fun)(args[0]);
case 2:
return ((mp_fun_2_t)self->fun)(args[0], args[1]);
case 3:
return ((mp_fun_3_t)self->fun)(args[0], args[1], args[2]);
default:
assert(0);
return mp_const_none;
}
} else {
// function takes a variable number of arguments, but no keywords
return ((mp_fun_var_t)self->fun)(n_args, args);
}
}
const mp_obj_type_t mp_type_fun_native = {
{ &mp_type_type },
.name = MP_QSTR_function,
.call = fun_native_call,
.binary_op = fun_binary_op,
};
// fun must have the correct signature for n_args fixed arguments
mp_obj_t mp_make_function_n(int n_args, void *fun) {
mp_obj_fun_native_t *o = m_new_obj(mp_obj_fun_native_t);
o->base.type = &mp_type_fun_native;
o->is_kw = false;
o->n_args_min = n_args;
o->n_args_max = n_args;
o->fun = fun;
return o;
}
mp_obj_t mp_make_function_var(int n_args_min, mp_fun_var_t fun) {
mp_obj_fun_native_t *o = m_new_obj(mp_obj_fun_native_t);
o->base.type = &mp_type_fun_native;
o->is_kw = false;
o->n_args_min = n_args_min;
o->n_args_max = MP_OBJ_FUN_ARGS_MAX;
o->fun = fun;
return o;
}
// min and max are inclusive
mp_obj_t mp_make_function_var_between(int n_args_min, int n_args_max, mp_fun_var_t fun) {
mp_obj_fun_native_t *o = m_new_obj(mp_obj_fun_native_t);
o->base.type = &mp_type_fun_native;
o->is_kw = false;
o->n_args_min = n_args_min;
o->n_args_max = n_args_max;
o->fun = fun;
return o;
}
/******************************************************************************/
/* byte code functions */
const char *mp_obj_code_get_name(const byte *code_info) {
qstr block_name = code_info[8] | (code_info[9] << 8) | (code_info[10] << 16) | (code_info[11] << 24);
return qstr_str(block_name);
}
const char *mp_obj_fun_get_name(mp_const_obj_t fun_in) {
const mp_obj_fun_bc_t *fun = fun_in;
const byte *code_info = fun->bytecode;
return mp_obj_code_get_name(code_info);
}
#if MICROPY_CPYTHON_COMPAT
STATIC void fun_bc_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
mp_obj_fun_bc_t *o = o_in;
print(env, "<function %s at 0x%x>", mp_obj_fun_get_name(o), o);
}
#endif
#if DEBUG_PRINT
STATIC void dump_args(const mp_obj_t *a, int sz) {
DEBUG_printf("%p: ", a);
for (int i = 0; i < sz; i++) {
DEBUG_printf("%p ", a[i]);
}
DEBUG_printf("\n");
}
#else
#define dump_args(...) (void)0
#endif
STATIC NORETURN void fun_pos_args_mismatch(mp_obj_fun_bc_t *f, uint expected, uint given) {
#if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
// Generic message, to be reused for other argument issues
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"argument num/types mismatch"));
#elif MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_NORMAL
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"function takes %d positional arguments but %d were given", expected, given));
#elif MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"%s() takes %d positional arguments but %d were given",
mp_obj_fun_get_name(f), expected, given));
#endif
}
// With this macro you can tune the maximum number of function state bytes
// that will be allocated on the stack. Any function that needs more
// than this will use the heap.
#define VM_MAX_STATE_ON_STACK (10 * sizeof(machine_uint_t))
// Set this to enable a simple stack overflow check.
#define VM_DETECT_STACK_OVERFLOW (0)
// code_state should have ->ip filled in (pointing past code info block),
// as well as ->n_state.
void mp_setup_code_state(mp_code_state *code_state, mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
// This function is pretty complicated. It's main aim is to be efficient in speed and RAM
// usage for the common case of positional only args.
mp_obj_fun_bc_t *self = self_in;
machine_uint_t n_state = code_state->n_state;
const byte *ip = code_state->ip;
code_state->code_info = self->bytecode;
code_state->sp = &code_state->state[0] - 1;
code_state->exc_sp = (mp_exc_stack_t*)(code_state->state + n_state) - 1;
// zero out the local stack to begin with
memset(code_state->state, 0, n_state * sizeof(*code_state->state));
const mp_obj_t *kwargs = args + n_args;
// var_pos_kw_args points to the stack where the var-args tuple, and var-kw dict, should go (if they are needed)
mp_obj_t *var_pos_kw_args = &code_state->state[n_state - 1 - self->n_pos_args - self->n_kwonly_args];
// check positional arguments
if (n_args > self->n_pos_args) {
// given more than enough arguments
if (!self->takes_var_args) {
fun_pos_args_mismatch(self, self->n_pos_args, n_args);
}
// put extra arguments in varargs tuple
*var_pos_kw_args-- = mp_obj_new_tuple(n_args - self->n_pos_args, args + self->n_pos_args);
n_args = self->n_pos_args;
} else {
if (self->takes_var_args) {
DEBUG_printf("passing empty tuple as *args\n");
*var_pos_kw_args-- = mp_const_empty_tuple;
}
// Apply processing and check below only if we don't have kwargs,
// otherwise, kw handling code below has own extensive checks.
if (n_kw == 0 && !self->has_def_kw_args) {
if (n_args >= self->n_pos_args - self->n_def_args) {
// given enough arguments, but may need to use some default arguments
for (uint i = n_args; i < self->n_pos_args; i++) {
code_state->state[n_state - 1 - i] = self->extra_args[i - (self->n_pos_args - self->n_def_args)];
}
} else {
fun_pos_args_mismatch(self, self->n_pos_args - self->n_def_args, n_args);
}
}
}
// copy positional args into state
for (uint i = 0; i < n_args; i++) {
code_state->state[n_state - 1 - i] = args[i];
}
// check keyword arguments
if (n_kw != 0 || self->has_def_kw_args) {
DEBUG_printf("Initial args: ");
dump_args(code_state->state + n_state - self->n_pos_args - self->n_kwonly_args, self->n_pos_args + self->n_kwonly_args);
mp_obj_t dict = MP_OBJ_NULL;
if (self->takes_kw_args) {
dict = mp_obj_new_dict(n_kw); // TODO: better go conservative with 0?
*var_pos_kw_args = dict;
}
for (uint i = 0; i < n_kw; i++) {
qstr arg_name = MP_OBJ_QSTR_VALUE(kwargs[2 * i]);
for (uint j = 0; j < self->n_pos_args + self->n_kwonly_args; j++) {
if (arg_name == self->args[j]) {
if (code_state->state[n_state - 1 - j] != MP_OBJ_NULL) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"function got multiple values for argument '%s'", qstr_str(arg_name)));
}
code_state->state[n_state - 1 - j] = kwargs[2 * i + 1];
goto continue2;
}
}
// Didn't find name match with positional args
if (!self->takes_kw_args) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "function does not take keyword arguments"));
}
mp_obj_dict_store(dict, kwargs[2 * i], kwargs[2 * i + 1]);
continue2:;
}
DEBUG_printf("Args with kws flattened: ");
dump_args(code_state->state + n_state - self->n_pos_args - self->n_kwonly_args, self->n_pos_args + self->n_kwonly_args);
// fill in defaults for positional args
mp_obj_t *d = &code_state->state[n_state - self->n_pos_args];
mp_obj_t *s = &self->extra_args[self->n_def_args - 1];
for (int i = self->n_def_args; i > 0; i--, d++, s--) {
if (*d == MP_OBJ_NULL) {
*d = *s;
}
}
DEBUG_printf("Args after filling default positional: ");
dump_args(code_state->state + n_state - self->n_pos_args - self->n_kwonly_args, self->n_pos_args + self->n_kwonly_args);
// Check that all mandatory positional args are specified
while (d < &code_state->state[n_state]) {
if (*d++ == MP_OBJ_NULL) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"function missing required positional argument #%d", &code_state->state[n_state] - d));
}
}
// Check that all mandatory keyword args are specified
// Fill in default kw args if we have them
for (uint i = 0; i < self->n_kwonly_args; i++) {
if (code_state->state[n_state - 1 - self->n_pos_args - i] == MP_OBJ_NULL) {
mp_map_elem_t *elem = NULL;
if (self->has_def_kw_args) {
elem = mp_map_lookup(&((mp_obj_dict_t*)self->extra_args[self->n_def_args])->map, MP_OBJ_NEW_QSTR(self->args[self->n_pos_args + i]), MP_MAP_LOOKUP);
}
if (elem != NULL) {
code_state->state[n_state - 1 - self->n_pos_args - i] = elem->value;
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"function missing required keyword argument '%s'", qstr_str(self->args[self->n_pos_args + i])));
}
}
}
} else {
// no keyword arguments given
if (self->n_kwonly_args != 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"function missing keyword-only argument"));
}
if (self->takes_kw_args) {
*var_pos_kw_args = mp_obj_new_dict(0);
}
}
// bytecode prelude: initialise closed over variables
for (uint n_local = *ip++; n_local > 0; n_local--) {
uint local_num = *ip++;
code_state->state[n_state - 1 - local_num] = mp_obj_new_cell(code_state->state[n_state - 1 - local_num]);
}
// now that we skipped over the prelude, set the ip for the VM
code_state->ip = ip;
DEBUG_printf("Calling: n_pos_args=%d, n_kwonly_args=%d\n", self->n_pos_args, self->n_kwonly_args);
dump_args(code_state->state + n_state - self->n_pos_args - self->n_kwonly_args, self->n_pos_args + self->n_kwonly_args);
dump_args(code_state->state, n_state);
}
STATIC mp_obj_t fun_bc_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
MP_STACK_CHECK();
DEBUG_printf("Input n_args: %d, n_kw: %d\n", n_args, n_kw);
DEBUG_printf("Input pos args: ");
dump_args(args, n_args);
DEBUG_printf("Input kw args: ");
dump_args(args + n_args, n_kw * 2);
mp_obj_fun_bc_t *self = self_in;
DEBUG_printf("Func n_def_args: %d\n", self->n_def_args);
const byte *ip = self->bytecode;
// get code info size, and skip line number table
machine_uint_t code_info_size = ip[0] | (ip[1] << 8) | (ip[2] << 16) | (ip[3] << 24);
ip += code_info_size;
// bytecode prelude: state size and exception stack size; 16 bit uints
machine_uint_t n_state = ip[0] | (ip[1] << 8);
machine_uint_t n_exc_stack = ip[2] | (ip[3] << 8);
ip += 4;
#if VM_DETECT_STACK_OVERFLOW
n_state += 1;
#endif
// allocate state for locals and stack
uint state_size = n_state * sizeof(mp_obj_t) + n_exc_stack * sizeof(mp_exc_stack_t);
mp_code_state *code_state;
if (state_size > VM_MAX_STATE_ON_STACK) {
code_state = m_new_obj_var(mp_code_state, byte, state_size);
} else {
code_state = alloca(sizeof(mp_code_state) + state_size);
}
code_state->n_state = n_state;
code_state->ip = ip;
mp_setup_code_state(code_state, self_in, n_args, n_kw, args);
// execute the byte code with the correct globals context
mp_obj_dict_t *old_globals = mp_globals_get();
mp_globals_set(self->globals);
mp_vm_return_kind_t vm_return_kind = mp_execute_bytecode(code_state, MP_OBJ_NULL);
mp_globals_set(old_globals);
#if VM_DETECT_STACK_OVERFLOW
if (vm_return_kind == MP_VM_RETURN_NORMAL) {
if (code_state->sp < code_state->state) {
printf("VM stack underflow: " INT_FMT "\n", code_state->sp - code_state->state);
assert(0);
}
}
// We can't check the case when an exception is returned in state[n_state - 1]
// and there are no arguments, because in this case our detection slot may have
// been overwritten by the returned exception (which is allowed).
if (!(vm_return_kind == MP_VM_RETURN_EXCEPTION && self->n_pos_args + self->n_kwonly_args == 0)) {
// Just check to see that we have at least 1 null object left in the state.
bool overflow = true;
for (uint i = 0; i < n_state - self->n_pos_args - self->n_kwonly_args; i++) {
if (code_state->state[i] == MP_OBJ_NULL) {
overflow = false;
break;
}
}
if (overflow) {
printf("VM stack overflow state=%p n_state+1=" UINT_FMT "\n", code_state->state, n_state);
assert(0);
}
}
#endif
mp_obj_t result;
switch (vm_return_kind) {
case MP_VM_RETURN_NORMAL:
// return value is in *sp
result = *code_state->sp;
break;
case MP_VM_RETURN_EXCEPTION:
// return value is in state[n_state - 1]
result = code_state->state[n_state - 1];
break;
case MP_VM_RETURN_YIELD: // byte-code shouldn't yield
default:
assert(0);
result = mp_const_none;
vm_return_kind = MP_VM_RETURN_NORMAL;
break;
}
// free the state if it was allocated on the heap
if (state_size > VM_MAX_STATE_ON_STACK) {
m_del_var(mp_code_state, byte, state_size, code_state);
}
if (vm_return_kind == MP_VM_RETURN_NORMAL) {
return result;
} else { // MP_VM_RETURN_EXCEPTION
nlr_raise(result);
}
}
const mp_obj_type_t mp_type_fun_bc = {
{ &mp_type_type },
.name = MP_QSTR_function,
#if MICROPY_CPYTHON_COMPAT
.print = fun_bc_print,
#endif
.call = fun_bc_call,
.binary_op = fun_binary_op,
};
mp_obj_t mp_obj_new_fun_bc(uint scope_flags, qstr *args, uint n_pos_args, uint n_kwonly_args, mp_obj_t def_args_in, mp_obj_t def_kw_args, const byte *code) {
uint n_def_args = 0;
uint n_extra_args = 0;
mp_obj_tuple_t *def_args = def_args_in;
if (def_args != MP_OBJ_NULL) {
assert(MP_OBJ_IS_TYPE(def_args, &mp_type_tuple));
n_def_args = def_args->len;
n_extra_args = def_args->len;
}
if (def_kw_args != MP_OBJ_NULL) {
n_extra_args += 1;
}
mp_obj_fun_bc_t *o = m_new_obj_var(mp_obj_fun_bc_t, mp_obj_t, n_extra_args);
o->base.type = &mp_type_fun_bc;
o->globals = mp_globals_get();
o->args = args;
o->n_pos_args = n_pos_args;
o->n_kwonly_args = n_kwonly_args;
o->n_def_args = n_def_args;
o->has_def_kw_args = def_kw_args != MP_OBJ_NULL;
o->takes_var_args = (scope_flags & MP_SCOPE_FLAG_VARARGS) != 0;
o->takes_kw_args = (scope_flags & MP_SCOPE_FLAG_VARKEYWORDS) != 0;
o->bytecode = code;
if (def_args != MP_OBJ_NULL) {
memcpy(o->extra_args, def_args->items, n_def_args * sizeof(mp_obj_t));
}
if (def_kw_args != MP_OBJ_NULL) {
o->extra_args[n_def_args] = def_kw_args;
}
return o;
}
/******************************************************************************/
/* inline assembler functions */
typedef struct _mp_obj_fun_asm_t {
mp_obj_base_t base;
int n_args;
void *fun;
} mp_obj_fun_asm_t;
typedef machine_uint_t (*inline_asm_fun_0_t)();
typedef machine_uint_t (*inline_asm_fun_1_t)(machine_uint_t);
typedef machine_uint_t (*inline_asm_fun_2_t)(machine_uint_t, machine_uint_t);
typedef machine_uint_t (*inline_asm_fun_3_t)(machine_uint_t, machine_uint_t, machine_uint_t);
// convert a Micro Python object to a sensible value for inline asm
STATIC machine_uint_t convert_obj_for_inline_asm(mp_obj_t obj) {
// TODO for byte_array, pass pointer to the array
if (MP_OBJ_IS_SMALL_INT(obj)) {
return MP_OBJ_SMALL_INT_VALUE(obj);
} else if (obj == mp_const_none) {
return 0;
} else if (obj == mp_const_false) {
return 0;
} else if (obj == mp_const_true) {
return 1;
} else if (MP_OBJ_IS_STR(obj)) {
// pointer to the string (it's probably constant though!)
uint l;
return (machine_uint_t)mp_obj_str_get_data(obj, &l);
} else {
mp_obj_type_t *type = mp_obj_get_type(obj);
if (0) {
#if MICROPY_PY_BUILTINS_FLOAT
} else if (type == &mp_type_float) {
// convert float to int (could also pass in float registers)
return (machine_int_t)mp_obj_float_get(obj);
#endif
} else if (type == &mp_type_tuple) {
// pointer to start of tuple (could pass length, but then could use len(x) for that)
uint len;
mp_obj_t *items;
mp_obj_tuple_get(obj, &len, &items);
return (machine_uint_t)items;
} else if (type == &mp_type_list) {
// pointer to start of list (could pass length, but then could use len(x) for that)
uint len;
mp_obj_t *items;
mp_obj_list_get(obj, &len, &items);
return (machine_uint_t)items;
} else {
mp_buffer_info_t bufinfo;
if (mp_get_buffer(obj, &bufinfo, MP_BUFFER_WRITE)) {
// supports the buffer protocol, return a pointer to the data
return (machine_uint_t)bufinfo.buf;
} else {
// just pass along a pointer to the object
return (machine_uint_t)obj;
}
}
}
}
// convert a return value from inline asm to a sensible Micro Python object
STATIC mp_obj_t convert_val_from_inline_asm(machine_uint_t val) {
return MP_OBJ_NEW_SMALL_INT(val);
}
STATIC mp_obj_t fun_asm_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_obj_fun_asm_t *self = self_in;
mp_arg_check_num(n_args, n_kw, self->n_args, self->n_args, false);
machine_uint_t ret;
if (n_args == 0) {
ret = ((inline_asm_fun_0_t)self->fun)();
} else if (n_args == 1) {
ret = ((inline_asm_fun_1_t)self->fun)(convert_obj_for_inline_asm(args[0]));
} else if (n_args == 2) {
ret = ((inline_asm_fun_2_t)self->fun)(convert_obj_for_inline_asm(args[0]), convert_obj_for_inline_asm(args[1]));
} else if (n_args == 3) {
ret = ((inline_asm_fun_3_t)self->fun)(convert_obj_for_inline_asm(args[0]), convert_obj_for_inline_asm(args[1]), convert_obj_for_inline_asm(args[2]));
} else {
assert(0);
ret = 0;
}
return convert_val_from_inline_asm(ret);
}
STATIC const mp_obj_type_t mp_type_fun_asm = {
{ &mp_type_type },
.name = MP_QSTR_function,
.call = fun_asm_call,
.binary_op = fun_binary_op,
};
mp_obj_t mp_obj_new_fun_asm(uint n_args, void *fun) {
mp_obj_fun_asm_t *o = m_new_obj(mp_obj_fun_asm_t);
o->base.type = &mp_type_fun_asm;
o->n_args = n_args;
o->fun = fun;
return o;
}
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