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Merge pull request #160 from pfalcon/elaborate-int

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Elaborate small-int/long-int
This commit is contained in:
Damien George 2014-01-12 16:32:21 -08:00
commit ec3e14e2af
7 changed files with 106 additions and 24 deletions
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7
py/gc.c
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@ -8,15 +8,8 @@
#if MICROPY_ENABLE_GC
// a machine word is big enough to hold a pointer
/*
#define BYTES_PER_WORD (8)
typedef unsigned long machine_uint_t;
*/
typedef unsigned char byte;
#define BITS_PER_BYTE (8)
#define BITS_PER_WORD (BITS_PER_BYTE * BYTES_PER_WORD)
#define WORDS_PER_BLOCK (4)
#define BYTES_PER_BLOCK (WORDS_PER_BLOCK * BYTES_PER_WORD)
#define STACK_SIZE (64) // tunable; minimum is 1

17
py/mpconfig.h
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@ -62,6 +62,18 @@
#define MICROPY_ENABLE_LEXER_UNIX (0)
#endif
// Long int implementation
#define MICROPY_LONGINT_IMPL_NONE (0)
#define MICROPY_LONGINT_IMPL_LONGLONG (1)
#ifndef MICROPY_LONGINT_IMPL
#define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_NONE)
#endif
#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_LONGLONG
typedef long long mp_longint_impl_t;
#endif
// Whether to support float and complex types
#ifndef MICROPY_ENABLE_FLOAT
#define MICROPY_ENABLE_FLOAT (0)
@ -76,6 +88,11 @@
/*****************************************************************************/
/* Miscellaneous settings */
#define BITS_PER_BYTE (8)
#define BITS_PER_WORD (BITS_PER_BYTE * BYTES_PER_WORD)
// machine_int_t value with most significant bit set
#define WORD_MSBIT_HIGH (1 << (BYTES_PER_WORD * 8 - 1))
// printf format spec to use for machine_int_t and friends
#ifndef INT_FMT
#ifdef __LP64__

4
py/obj.h
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@ -34,6 +34,8 @@ typedef struct _mp_obj_base_t mp_obj_base_t;
// - xxxx...xx10: a qstr, bits 2 and above are the value
// - xxxx...xx00: a pointer to an mp_obj_base_t
// In SMALL_INT, next-to-highest bits is used as sign, so both must match for value in range
#define MP_OBJ_FITS_SMALL_INT(n) ((((n) ^ ((n) << 1)) & WORD_MSBIT_HIGH) == 0)
#define MP_OBJ_IS_SMALL_INT(o) ((((mp_small_int_t)(o)) & 1) != 0)
#define MP_OBJ_IS_QSTR(o) ((((mp_small_int_t)(o)) & 3) == 2)
#define MP_OBJ_IS_OBJ(o) ((((mp_small_int_t)(o)) & 3) == 0)
@ -196,6 +198,8 @@ mp_obj_t mp_obj_new_none(void);
mp_obj_t mp_obj_new_bool(bool value);
mp_obj_t mp_obj_new_cell(mp_obj_t obj);
mp_obj_t mp_obj_new_int(machine_int_t value);
mp_obj_t mp_obj_new_int_from_uint(machine_uint_t value);
mp_obj_t mp_obj_new_int_from_long_str(const char *s);
mp_obj_t mp_obj_new_str(qstr qstr);
#if MICROPY_ENABLE_FLOAT
mp_obj_t mp_obj_new_float(mp_float_t val);

46
py/objint.c
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@ -11,8 +11,16 @@
typedef struct _mp_obj_int_t {
mp_obj_base_t base;
#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
mp_longint_impl_t val;
#endif
} mp_obj_int_t;
void int_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in);
mp_obj_t int_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in);
// This dispatcher function is expected to be independent of the implementation
// of long int
static mp_obj_t int_make_new(mp_obj_t type_in, int n_args, const mp_obj_t *args) {
switch (n_args) {
case 0:
@ -20,7 +28,7 @@ static mp_obj_t int_make_new(mp_obj_t type_in, int n_args, const mp_obj_t *args)
case 1:
// TODO allow string as arg and parse it
return MP_OBJ_NEW_SMALL_INT(mp_obj_get_int(args[0]));
return mp_obj_new_int(mp_obj_get_int(args[0]));
//case 2:
// TODO, parse with given base
@ -33,9 +41,41 @@ static mp_obj_t int_make_new(mp_obj_t type_in, int n_args, const mp_obj_t *args)
const mp_obj_type_t int_type = {
{ &mp_const_type },
"int",
.print = int_print,
.make_new = int_make_new,
.binary_op = int_binary_op,
};
mp_obj_t mp_obj_new_int(machine_int_t value) {
return MP_OBJ_NEW_SMALL_INT(value);
#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_NONE
// This is called only for non-SMALL_INT
void int_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in) {
}
// This is called only for non-SMALL_INT
mp_obj_t int_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
assert(0);
}
// This is called only with strings whose value doesn't fit in SMALL_INT
mp_obj_t mp_obj_new_int_from_long_str(const char *s) {
assert(0);
}
mp_obj_t mp_obj_new_int_from_uint(machine_uint_t value) {
// SMALL_INT accepts only signed numbers, of one bit less size
// then word size, which totals 2 bits less for unsigned numbers.
if ((value & (WORD_MSBIT_HIGH | (WORD_MSBIT_HIGH >> 1))) == 0) {
return MP_OBJ_NEW_SMALL_INT(value);
}
// TODO: Raise exception
assert(0);
}
mp_obj_t mp_obj_new_int(machine_int_t value) {
if (MP_OBJ_FITS_SMALL_INT(value)) {
return MP_OBJ_NEW_SMALL_INT(value);
}
// TODO: Raise exception
assert(0);
}
#endif

13
py/parse.c
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@ -196,7 +196,7 @@ static void push_result_token(parser_t *parser, const mp_lexer_t *lex) {
} else if (tok->kind == MP_TOKEN_NUMBER) {
bool dec = false;
bool small_int = true;
int int_val = 0;
machine_int_t int_val = 0;
int len = tok->len;
const char *str = tok->str;
int base = 10;
@ -216,7 +216,9 @@ static void push_result_token(parser_t *parser, const mp_lexer_t *lex) {
i = 2;
}
}
bool overflow = false;
for (; i < len; i++) {
machine_int_t old_val = int_val;
if (unichar_isdigit(str[i]) && str[i] - '0' < base) {
int_val = base * int_val + str[i] - '0';
} else if (base == 16 && 'a' <= str[i] && str[i] <= 'f') {
@ -230,10 +232,17 @@ static void push_result_token(parser_t *parser, const mp_lexer_t *lex) {
small_int = false;
break;
}
if (int_val < old_val) {
// If new value became less than previous, it's overflow
overflow = true;
} else if ((old_val ^ int_val) & WORD_MSBIT_HIGH) {
// If signed number changed sign - it's overflow
overflow = true;
}
}
if (dec) {
pn = mp_parse_node_new_leaf(MP_PARSE_NODE_DECIMAL, qstr_from_strn_copy(str, len));
} else if (small_int && MP_FIT_SMALL_INT(int_val)) {
} else if (small_int && !overflow && MP_FIT_SMALL_INT(int_val)) {
pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, int_val);
} else {
pn = mp_parse_node_new_leaf(MP_PARSE_NODE_INTEGER, qstr_from_strn_copy(str, len));

17
py/runtime.c
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@ -268,10 +268,6 @@ void rt_assign_inline_asm_code(int unique_code_id, void *fun, uint len, int n_ar
#endif
}
static bool fit_small_int(mp_small_int_t o) {
return true;
}
int rt_is_true(mp_obj_t arg) {
DEBUG_OP_printf("is true %p\n", arg);
if (MP_OBJ_IS_SMALL_INT(arg)) {
@ -436,13 +432,10 @@ mp_obj_t rt_unary_op(int op, mp_obj_t arg) {
case RT_UNARY_OP_INVERT: val = ~val; break;
default: assert(0); val = 0;
}
if (fit_small_int(val)) {
if (MP_OBJ_FITS_SMALL_INT(val)) {
return MP_OBJ_NEW_SMALL_INT(val);
} else {
// TODO make a bignum
assert(0);
return mp_const_none;
}
return mp_obj_new_int(val);
} else { // will be an object (small ints are caught in previous if)
mp_obj_base_t *o = arg;
if (o->type->unary_op != NULL) {
@ -551,11 +544,11 @@ mp_obj_t rt_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
default: assert(0);
}
if (fit_small_int(lhs_val)) {
// TODO: We just should make mp_obj_new_int() inline and use that
if (MP_OBJ_FITS_SMALL_INT(lhs_val)) {
return MP_OBJ_NEW_SMALL_INT(lhs_val);
}
// TODO: return long int
assert(0);
return mp_obj_new_int(lhs_val);
} else if (MP_OBJ_IS_TYPE(rhs, &float_type)) {
return mp_obj_float_binary_op(op, lhs_val, rhs);
} else if (MP_OBJ_IS_TYPE(rhs, &complex_type)) {

26
tests/basics/tests/int-small.py Normal file
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@ -0,0 +1,26 @@
# This test small int range for 32-bit machine
a = 0x3fffff
print(a)
a *= 0x10
print(a)
a *= 0x10
print(a)
a += 0xff
print(a)
# This would overflow
#a += 1
a = -0x3fffff
print(a)
a *= 0x10
print(a)
a *= 0x10
print(a)
a -= 0xff
print(a)
# This still doesn't overflow
a -= 1
print(a)
# This would overflow
#a -= 1