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micropython/py/objfun.c

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/*
* This file is part of the MicroPython 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 <string.h>
#include <assert.h>
#include "py/objtuple.h"
#include "py/objfun.h"
#include "py/runtime.h"
#include "py/bc.h"
#include "py/stackctrl.h"
#if MICROPY_DEBUG_VERBOSE // print debugging info
#define DEBUG_PRINT (1)
#else // don't print debugging info
#define DEBUG_PRINT (0)
#define DEBUG_printf(...) (void)0
#endif
// Note: the "name" entry in mp_obj_type_t for a function type must be
// MP_QSTR_function because it is used to determine if an object is of generic
// function type.
/******************************************************************************/
/* builtin functions */
STATIC mp_obj_t fun_builtin_0_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
(void)args;
assert(mp_obj_is_type(self_in, &mp_type_fun_builtin_0));
mp_obj_fun_builtin_fixed_t *self = MP_OBJ_TO_PTR(self_in);
mp_arg_check_num(n_args, n_kw, 0, 0, false);
return self->fun._0();
}
const mp_obj_type_t mp_type_fun_builtin_0 = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_BINDS_SELF | MP_TYPE_FLAG_BUILTIN_FUN,
.name = MP_QSTR_function,
.call = fun_builtin_0_call,
.unary_op = mp_generic_unary_op,
};
STATIC mp_obj_t fun_builtin_1_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
assert(mp_obj_is_type(self_in, &mp_type_fun_builtin_1));
mp_obj_fun_builtin_fixed_t *self = MP_OBJ_TO_PTR(self_in);
mp_arg_check_num(n_args, n_kw, 1, 1, false);
return self->fun._1(args[0]);
}
const mp_obj_type_t mp_type_fun_builtin_1 = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_BINDS_SELF | MP_TYPE_FLAG_BUILTIN_FUN,
.name = MP_QSTR_function,
.call = fun_builtin_1_call,
.unary_op = mp_generic_unary_op,
};
STATIC mp_obj_t fun_builtin_2_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
assert(mp_obj_is_type(self_in, &mp_type_fun_builtin_2));
mp_obj_fun_builtin_fixed_t *self = MP_OBJ_TO_PTR(self_in);
mp_arg_check_num(n_args, n_kw, 2, 2, false);
return self->fun._2(args[0], args[1]);
}
const mp_obj_type_t mp_type_fun_builtin_2 = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_BINDS_SELF | MP_TYPE_FLAG_BUILTIN_FUN,
.name = MP_QSTR_function,
.call = fun_builtin_2_call,
.unary_op = mp_generic_unary_op,
};
STATIC mp_obj_t fun_builtin_3_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
assert(mp_obj_is_type(self_in, &mp_type_fun_builtin_3));
mp_obj_fun_builtin_fixed_t *self = MP_OBJ_TO_PTR(self_in);
mp_arg_check_num(n_args, n_kw, 3, 3, false);
return self->fun._3(args[0], args[1], args[2]);
}
const mp_obj_type_t mp_type_fun_builtin_3 = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_BINDS_SELF | MP_TYPE_FLAG_BUILTIN_FUN,
.name = MP_QSTR_function,
.call = fun_builtin_3_call,
.unary_op = mp_generic_unary_op,
};
STATIC mp_obj_t fun_builtin_var_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
assert(mp_obj_is_type(self_in, &mp_type_fun_builtin_var));
mp_obj_fun_builtin_var_t *self = MP_OBJ_TO_PTR(self_in);
// check number of arguments
mp_arg_check_num_sig(n_args, n_kw, self->sig);
if (self->sig & 1) {
// 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 self->fun.kw(n_args, args, &kw_args);
} else {
// function takes a variable number of arguments, but no keywords
return self->fun.var(n_args, args);
}
}
const mp_obj_type_t mp_type_fun_builtin_var = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_BINDS_SELF | MP_TYPE_FLAG_BUILTIN_FUN,
.name = MP_QSTR_function,
.call = fun_builtin_var_call,
.unary_op = mp_generic_unary_op,
};
/******************************************************************************/
/* byte code functions */
qstr mp_obj_code_get_name(const byte *code_info) {
MP_BC_PRELUDE_SIZE_DECODE(code_info);
#if MICROPY_PERSISTENT_CODE
return code_info[0] | (code_info[1] << 8);
#else
return mp_decode_uint_value(code_info);
#endif
}
#if MICROPY_EMIT_NATIVE
STATIC const mp_obj_type_t mp_type_fun_native;
#endif
qstr mp_obj_fun_get_name(mp_const_obj_t fun_in) {
const mp_obj_fun_bc_t *fun = MP_OBJ_TO_PTR(fun_in);
#if MICROPY_EMIT_NATIVE
if (fun->base.type == &mp_type_fun_native || fun->base.type == &mp_type_native_gen_wrap) {
// TODO native functions don't have name stored
return MP_QSTR_;
}
#endif
const byte *bc = fun->bytecode;
MP_BC_PRELUDE_SIG_DECODE(bc);
return mp_obj_code_get_name(bc);
}
#if MICROPY_CPYTHON_COMPAT
STATIC void fun_bc_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
(void)kind;
mp_obj_fun_bc_t *o = MP_OBJ_TO_PTR(o_in);
mp_printf(print, "<function %q at 0x%p>", mp_obj_fun_get_name(o_in), o);
}
#endif
#if DEBUG_PRINT
STATIC void dump_args(const mp_obj_t *a, size_t sz) {
DEBUG_printf("%p: ", a);
for (size_t i = 0; i < sz; i++) {
DEBUG_printf("%p ", a[i]);
}
DEBUG_printf("\n");
}
#else
#define dump_args(...) (void)0
#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 try to use the heap, with fallback to stack allocation.
#define VM_MAX_STATE_ON_STACK (sizeof(mp_uint_t) * 11)
#define DECODE_CODESTATE_SIZE(bytecode, n_state_out_var, state_size_out_var) \
{ \
const uint8_t *ip = bytecode; \
size_t n_exc_stack, scope_flags, n_pos_args, n_kwonly_args, n_def_args; \
MP_BC_PRELUDE_SIG_DECODE_INTO(ip, n_state_out_var, n_exc_stack, scope_flags, n_pos_args, n_kwonly_args, n_def_args); \
(void)scope_flags; (void)n_pos_args; (void)n_kwonly_args; (void)n_def_args; \
\
/* state size in bytes */ \
state_size_out_var = n_state_out_var * sizeof(mp_obj_t) \
+ n_exc_stack * sizeof(mp_exc_stack_t); \
}
#define INIT_CODESTATE(code_state, _fun_bc, _n_state, n_args, n_kw, args) \
code_state->fun_bc = _fun_bc; \
code_state->ip = 0; \
code_state->n_state = _n_state; \
mp_setup_code_state(code_state, n_args, n_kw, args); \
code_state->old_globals = mp_globals_get();
#if MICROPY_STACKLESS
mp_code_state_t *mp_obj_fun_bc_prepare_codestate(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
MP_STACK_CHECK();
mp_obj_fun_bc_t *self = MP_OBJ_TO_PTR(self_in);
size_t n_state, state_size;
DECODE_CODESTATE_SIZE(self->bytecode, n_state, state_size);
mp_code_state_t *code_state;
#if MICROPY_ENABLE_PYSTACK
code_state = mp_pystack_alloc(sizeof(mp_code_state_t) + state_size);
#else
// If we use m_new_obj_var(), then on no memory, MemoryError will be
// raised. But this is not correct exception for a function call,
// RuntimeError should be raised instead. So, we use m_new_obj_var_maybe(),
// return NULL, then vm.c takes the needed action (either raise
// RuntimeError or fallback to stack allocation).
code_state = m_new_obj_var_maybe(mp_code_state_t, byte, state_size);
if (!code_state) {
return NULL;
}
#endif
INIT_CODESTATE(code_state, self, n_state, n_args, n_kw, args);
// execute the byte code with the correct globals context
mp_globals_set(self->globals);
return code_state;
}
#endif
STATIC mp_obj_t fun_bc_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
MP_STACK_CHECK();
DEBUG_printf("Input n_args: " UINT_FMT ", n_kw: " UINT_FMT "\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 = MP_OBJ_TO_PTR(self_in);
size_t n_state, state_size;
DECODE_CODESTATE_SIZE(self->bytecode, n_state, state_size);
// allocate state for locals and stack
mp_code_state_t *code_state = NULL;
#if MICROPY_ENABLE_PYSTACK
code_state = mp_pystack_alloc(sizeof(mp_code_state_t) + state_size);
#else
if (state_size > VM_MAX_STATE_ON_STACK) {
code_state = m_new_obj_var_maybe(mp_code_state_t, byte, state_size);
#if MICROPY_DEBUG_VM_STACK_OVERFLOW
if (code_state != NULL) {
memset(code_state->state, 0, state_size);
}
#endif
}
if (code_state == NULL) {
code_state = alloca(sizeof(mp_code_state_t) + state_size);
#if MICROPY_DEBUG_VM_STACK_OVERFLOW
memset(code_state->state, 0, state_size);
#endif
state_size = 0; // indicate that we allocated using alloca
}
#endif
INIT_CODESTATE(code_state, self, n_state, n_args, n_kw, args);
// execute the byte code with the correct globals context
mp_globals_set(self->globals);
mp_vm_return_kind_t vm_return_kind = mp_execute_bytecode(code_state, MP_OBJ_NULL);
mp_globals_set(code_state->old_globals);
#if MICROPY_DEBUG_VM_STACK_OVERFLOW
if (vm_return_kind == MP_VM_RETURN_NORMAL) {
if (code_state->sp < code_state->state) {
mp_printf(MICROPY_DEBUG_PRINTER, "VM stack underflow: " INT_FMT "\n", code_state->sp - code_state->state);
assert(0);
}
}
const byte *bytecode_ptr = self->bytecode;
size_t n_state_unused, n_exc_stack_unused, scope_flags_unused;
size_t n_pos_args, n_kwonly_args, n_def_args_unused;
MP_BC_PRELUDE_SIG_DECODE_INTO(bytecode_ptr, n_state_unused, n_exc_stack_unused,
scope_flags_unused, n_pos_args, n_kwonly_args, n_def_args_unused);
// We can't check the case when an exception is returned in state[0]
// 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 && n_pos_args + n_kwonly_args == 0)) {
// Just check to see that we have at least 1 null object left in the state.
bool overflow = true;
for (size_t i = 0; i < n_state - n_pos_args - n_kwonly_args; ++i) {
if (code_state->state[i] == MP_OBJ_NULL) {
overflow = false;
break;
}
}
if (overflow) {
mp_printf(MICROPY_DEBUG_PRINTER, "VM stack overflow state=%p n_state+1=" UINT_FMT "\n", code_state->state, n_state);
assert(0);
}
}
#endif
mp_obj_t result;
if (vm_return_kind == MP_VM_RETURN_NORMAL) {
// return value is in *sp
result = *code_state->sp;
} else {
// must be an exception because normal functions can't yield
assert(vm_return_kind == MP_VM_RETURN_EXCEPTION);
// returned exception is in state[0]
result = code_state->state[0];
}
#if MICROPY_ENABLE_PYSTACK
mp_pystack_free(code_state);
#else
// free the state if it was allocated on the heap
if (state_size != 0) {
m_del_var(mp_code_state_t, byte, state_size, code_state);
}
#endif
if (vm_return_kind == MP_VM_RETURN_NORMAL) {
return result;
} else { // MP_VM_RETURN_EXCEPTION
nlr_raise(result);
}
}
#if MICROPY_PY_FUNCTION_ATTRS
void mp_obj_fun_bc_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
if (dest[0] != MP_OBJ_NULL) {
// not load attribute
return;
}
if (attr == MP_QSTR___name__) {
dest[0] = MP_OBJ_NEW_QSTR(mp_obj_fun_get_name(self_in));
}
if (attr == MP_QSTR___globals__) {
mp_obj_fun_bc_t *self = MP_OBJ_TO_PTR(self_in);
dest[0] = MP_OBJ_FROM_PTR(self->globals);
}
}
#endif
const mp_obj_type_t mp_type_fun_bc = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_BINDS_SELF,
.name = MP_QSTR_function,
#if MICROPY_CPYTHON_COMPAT
.print = fun_bc_print,
#endif
.call = fun_bc_call,
.unary_op = mp_generic_unary_op,
#if MICROPY_PY_FUNCTION_ATTRS
.attr = mp_obj_fun_bc_attr,
#endif
};
mp_obj_t mp_obj_new_fun_bc(mp_obj_t def_args_in, mp_obj_t def_kw_args, const byte *code, const mp_uint_t *const_table) {
size_t n_def_args = 0;
size_t n_extra_args = 0;
mp_obj_tuple_t *def_args = MP_OBJ_TO_PTR(def_args_in);
if (def_args_in != MP_OBJ_NULL) {
assert(mp_obj_is_type(def_args_in, &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->bytecode = code;
o->const_table = const_table;
if (def_args != 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 MP_OBJ_FROM_PTR(o);
}
/******************************************************************************/
/* native functions */
#if MICROPY_EMIT_NATIVE
STATIC mp_obj_t fun_native_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
MP_STACK_CHECK();
mp_obj_fun_bc_t *self = self_in;
mp_call_fun_t fun = MICROPY_MAKE_POINTER_CALLABLE((void *)self->bytecode);
return fun(self_in, n_args, n_kw, args);
}
STATIC const mp_obj_type_t mp_type_fun_native = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_BINDS_SELF,
.name = MP_QSTR_function,
.call = fun_native_call,
.unary_op = mp_generic_unary_op,
};
mp_obj_t mp_obj_new_fun_native(mp_obj_t def_args_in, mp_obj_t def_kw_args, const void *fun_data, const mp_uint_t *const_table) {
mp_obj_fun_bc_t *o = mp_obj_new_fun_bc(def_args_in, def_kw_args, (const byte *)fun_data, const_table);
o->base.type = &mp_type_fun_native;
return o;
}
#endif // MICROPY_EMIT_NATIVE
/******************************************************************************/
/* inline assembler functions */
#if MICROPY_EMIT_INLINE_ASM
typedef struct _mp_obj_fun_asm_t {
mp_obj_base_t base;
size_t n_args;
const void *fun_data; // GC must be able to trace this pointer
mp_uint_t type_sig;
} mp_obj_fun_asm_t;
typedef mp_uint_t (*inline_asm_fun_0_t)(void);
typedef mp_uint_t (*inline_asm_fun_1_t)(mp_uint_t);
typedef mp_uint_t (*inline_asm_fun_2_t)(mp_uint_t, mp_uint_t);
typedef mp_uint_t (*inline_asm_fun_3_t)(mp_uint_t, mp_uint_t, mp_uint_t);
typedef mp_uint_t (*inline_asm_fun_4_t)(mp_uint_t, mp_uint_t, mp_uint_t, mp_uint_t);
// convert a MicroPython object to a sensible value for inline asm
STATIC mp_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_type(obj, &mp_type_int)) {
return mp_obj_int_get_truncated(obj);
} else if (mp_obj_is_str(obj)) {
// pointer to the string (it's probably constant though!)
size_t l;
return (mp_uint_t)mp_obj_str_get_data(obj, &l);
} else {
const mp_obj_type_t *type = mp_obj_get_type(obj);
#if MICROPY_PY_BUILTINS_FLOAT
if (type == &mp_type_float) {
// convert float to int (could also pass in float registers)
return (mp_int_t)mp_obj_float_get(obj);
}
#endif
if (type == &mp_type_tuple || type == &mp_type_list) {
// pointer to start of tuple (could pass length, but then could use len(x) for that)
size_t len;
mp_obj_t *items;
mp_obj_get_array(obj, &len, &items);
return (mp_uint_t)items;
} else {
mp_buffer_info_t bufinfo;
if (mp_get_buffer(obj, &bufinfo, MP_BUFFER_READ)) {
// supports the buffer protocol, return a pointer to the data
return (mp_uint_t)bufinfo.buf;
} else {
// just pass along a pointer to the object
return (mp_uint_t)obj;
}
}
}
}
STATIC mp_obj_t fun_asm_call(mp_obj_t self_in, size_t n_args, size_t 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);
const void *fun = MICROPY_MAKE_POINTER_CALLABLE(self->fun_data);
mp_uint_t ret;
if (n_args == 0) {
ret = ((inline_asm_fun_0_t)fun)();
} else if (n_args == 1) {
ret = ((inline_asm_fun_1_t)fun)(convert_obj_for_inline_asm(args[0]));
} else if (n_args == 2) {
ret = ((inline_asm_fun_2_t)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)fun)(convert_obj_for_inline_asm(args[0]), convert_obj_for_inline_asm(args[1]), convert_obj_for_inline_asm(args[2]));
} else {
// compiler allows at most 4 arguments
assert(n_args == 4);
ret = ((inline_asm_fun_4_t)fun)(
convert_obj_for_inline_asm(args[0]),
convert_obj_for_inline_asm(args[1]),
convert_obj_for_inline_asm(args[2]),
convert_obj_for_inline_asm(args[3])
);
}
return mp_native_to_obj(ret, self->type_sig);
}
STATIC const mp_obj_type_t mp_type_fun_asm = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_BINDS_SELF,
.name = MP_QSTR_function,
.call = fun_asm_call,
.unary_op = mp_generic_unary_op,
};
mp_obj_t mp_obj_new_fun_asm(size_t n_args, const void *fun_data, mp_uint_t type_sig) {
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_data = fun_data;
o->type_sig = type_sig;
return o;
}
#endif // MICROPY_EMIT_INLINE_ASM