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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2016 Damien P. George
*
* 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 <stdint.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include "py/nlr.h"
#include "py/lexer.h"
#include "py/parse.h"
#include "py/parsenum.h"
#include "py/smallint.h"
#if MICROPY_ENABLE_COMPILER && MICROPY_USE_SMALL_HEAP_COMPILER
#define RULE_ACT_ARG_MASK (0x0f)
#define RULE_ACT_KIND_MASK (0x30)
#define RULE_ACT_ALLOW_IDENT (0x40)
#define RULE_ACT_ADD_BLANK (0x80)
#define RULE_ACT_OR (0x10)
#define RULE_ACT_AND (0x20)
#define RULE_ACT_LIST (0x30)
#define RULE_ARG_KIND_MASK (0xf000)
#define RULE_ARG_ARG_MASK (0x0fff)
#define RULE_ARG_TOK (0x1000)
#define RULE_ARG_RULE (0x2000)
#define RULE_ARG_OPT_RULE (0x3000)
#define ADD_BLANK_NODE(rule) ((rule->act & RULE_ACT_ADD_BLANK) != 0)
// (un)comment to use rule names; for debugging
//#define USE_RULE_NAME (1)
typedef struct _rule_t {
byte rule_id;
byte act;
#ifdef USE_RULE_NAME
const char *rule_name;
#endif
uint16_t arg[];
} rule_t;
enum {
// define rules with a compile function
#define DEF_RULE(rule, comp, kind, ...) RULE_##rule,
#define DEF_RULE_NC(rule, kind, ...)
#include "py/grammar.h"
#undef DEF_RULE
#undef DEF_RULE_NC
RULE_const_object, // special node for a constant, generic Python object
// define rules without a compile function
#define DEF_RULE(rule, comp, kind, ...)
#define DEF_RULE_NC(rule, kind, ...) RULE_##rule,
#include "py/grammar.h"
#undef DEF_RULE
#undef DEF_RULE_NC
};
#define or(n) (RULE_ACT_OR | n)
#define and(n) (RULE_ACT_AND | n)
#define and_ident(n) (RULE_ACT_AND | n | RULE_ACT_ALLOW_IDENT)
#define and_blank(n) (RULE_ACT_AND | n | RULE_ACT_ADD_BLANK)
#define one_or_more (RULE_ACT_LIST | 2)
#define list (RULE_ACT_LIST | 1)
#define list_with_end (RULE_ACT_LIST | 3)
#define tok(t) (RULE_ARG_TOK | MP_TOKEN_##t)
#define rule(r) (RULE_ARG_RULE | RULE_##r)
#define opt_rule(r) (RULE_ARG_OPT_RULE | RULE_##r)
#ifdef USE_RULE_NAME
#define DEF_RULE(rule, comp, kind, ...) static const rule_t rule_##rule = { RULE_##rule, kind, #rule, { __VA_ARGS__ } };
#define DEF_RULE_NC(rule, kind, ...) static const rule_t rule_##rule = { RULE_##rule, kind, #rule, { __VA_ARGS__ } };
#else
#define DEF_RULE(rule, comp, kind, ...) static const rule_t rule_##rule = { RULE_##rule, kind, { __VA_ARGS__ } };
#define DEF_RULE_NC(rule, kind, ...) static const rule_t rule_##rule = { RULE_##rule, kind, { __VA_ARGS__ } };
#endif
#include "py/grammar.h"
#undef or
#undef and
#undef list
#undef list_with_end
#undef tok
#undef rule
#undef opt_rule
#undef one_or_more
#undef DEF_RULE
#undef DEF_RULE_NC
STATIC const rule_t *rules[] = {
// define rules with a compile function
#define DEF_RULE(rule, comp, kind, ...) &rule_##rule,
#define DEF_RULE_NC(rule, kind, ...)
#include "py/grammar.h"
#undef DEF_RULE
#undef DEF_RULE_NC
NULL, // RULE_const_object
// define rules without a compile function
#define DEF_RULE(rule, comp, kind, ...)
#define DEF_RULE_NC(rule, kind, ...) &rule_##rule,
#include "py/grammar.h"
#undef DEF_RULE
#undef DEF_RULE_NC
};
typedef struct _rule_stack_t {
size_t src_line : 8 * sizeof(size_t) - 8; // maximum bits storing source line number
size_t rule_id : 8; // this must be large enough to fit largest rule number
size_t arg_i; // this dictates the maximum nodes in a "list" of things
size_t pt_off;
} rule_stack_t;
typedef struct _mp_parse_chunk_t {
size_t alloc;
union {
size_t used;
struct _mp_parse_chunk_t *next;
} union_;
byte data[];
} mp_parse_chunk_t;
typedef enum {
PARSE_ERROR_NONE = 0,
PARSE_ERROR_MEMORY,
PARSE_ERROR_CONST,
} parse_error_t;
typedef struct _parser_t {
parse_error_t parse_error;
size_t rule_stack_alloc;
size_t rule_stack_top;
rule_stack_t *rule_stack;
mp_uint_t cur_scope_id;
size_t co_alloc;
size_t co_used;
mp_uint_t *co_data;
mp_lexer_t *lexer;
mp_parse_tree_t tree;
#if MICROPY_COMP_CONST
mp_map_t consts;
#endif
} parser_t;
STATIC void push_rule(parser_t *parser, size_t src_line, const rule_t *rule, size_t arg_i, size_t pt_off) {
if (parser->parse_error) {
return;
}
if (parser->rule_stack_top >= parser->rule_stack_alloc) {
rule_stack_t *rs = m_renew_maybe(rule_stack_t, parser->rule_stack, parser->rule_stack_alloc, parser->rule_stack_alloc + MICROPY_ALLOC_PARSE_RULE_INC, true);
if (rs == NULL) {
parser->parse_error = PARSE_ERROR_MEMORY;
return;
}
parser->rule_stack = rs;
parser->rule_stack_alloc += MICROPY_ALLOC_PARSE_RULE_INC;
}
rule_stack_t *rs = &parser->rule_stack[parser->rule_stack_top++];
rs->src_line = src_line;
rs->rule_id = rule->rule_id;
rs->arg_i = arg_i;
rs->pt_off = pt_off;
}
STATIC void push_rule_from_arg(parser_t *parser, size_t arg) {
assert((arg & RULE_ARG_KIND_MASK) == RULE_ARG_RULE || (arg & RULE_ARG_KIND_MASK) == RULE_ARG_OPT_RULE);
size_t rule_id = arg & RULE_ARG_ARG_MASK;
push_rule(parser, parser->lexer->tok_line, rules[rule_id], 0, 0);
}
STATIC void pop_rule(parser_t *parser, const rule_t **rule, size_t *arg_i, size_t *src_line, size_t *pt_off) {
assert(!parser->parse_error);
parser->rule_stack_top -= 1;
*rule = rules[parser->rule_stack[parser->rule_stack_top].rule_id];
*arg_i = parser->rule_stack[parser->rule_stack_top].arg_i;
*src_line = parser->rule_stack[parser->rule_stack_top].src_line;
*pt_off = parser->rule_stack[parser->rule_stack_top].pt_off;
}
typedef struct _pt_t {
vstr_t vv;
} pt_t;
STATIC pt_t *pt_new(void) {
pt_t *pt = m_new_obj(pt_t);
vstr_init(&pt->vv, 16);
return pt;
}
STATIC byte *pt_raw_add_blank(pt_t *pt, size_t nbytes) {
return (byte*)vstr_add_len(&pt->vv, nbytes);
}
STATIC byte *pt_raw_ins_blank(pt_t *pt, size_t pt_off, size_t nbytes) {
return (byte*)vstr_ins_blank_bytes(&pt->vv, pt_off, nbytes);
}
STATIC void pt_raw_truncate_at(pt_t *pt, size_t pt_off) {
pt->vv.len = pt_off;
}
STATIC int vuint_nbytes(size_t val) {
int n = 0;
do {
n += 1;
val >>= 7;
} while (val != 0);
return n;
}
STATIC void vuint_store(byte *p, int nbytes, size_t val) {
p += nbytes;
*--p = val & 0x7f;
for (--nbytes; nbytes > 0; --nbytes) {
val >>= 7;
*--p = 0x80 | (val & 0x7f);
}
}
STATIC size_t vuint_load(const byte **p_in) {
const byte *p = *p_in;
size_t val = 0;
do {
val = (val << 7) + (*p & 0x7f);
} while ((*p++ & 0x80) != 0);
*p_in = p;
return val;
}
STATIC byte *pt_advance(const byte *p, bool full_rule) {
switch (*p++) {
case MP_PT_NULL:
break;
case MP_PT_TOKEN:
p += 1;
break;
case MP_PT_SMALL_INT:
p += BYTES_PER_WORD;
break;
case MP_PT_STRING:
p += 2;
break;
case MP_PT_BYTES:
p += 2;
break;
case MP_PT_CONST_OBJECT:
vuint_load(&p);
break;
default:
if (p[-1] < MP_PT_RULE_BASE) {
// MP_PT_ID_BASE
p += 1;
} else {
// MP_PT_RULE_BASE
vuint_load(&p);
uint32_t n = vuint_load(&p);
if (full_rule) {
p += n;
}
}
break;
}
return (byte*)p;
}
bool mp_parse_node_get_int_maybe(const byte *p, mp_obj_t *o, mp_uint_t *co_data) {
if (pt_is_small_int(p)) {
*o = MP_OBJ_NEW_SMALL_INT(pt_small_int_value(p));
return true;
} else if (*p == MP_PT_CONST_OBJECT) {
size_t idx;
p = pt_extract_const_obj(p, &idx);
*o = (mp_obj_t)co_data[idx];
return true;
} else {
return false;
}
}
// TODO this could perhaps allow *p to be null and in that case return null?
const byte *mp_parse_node_extract_list(const byte **p, size_t pn_kind) {
if (pt_is_null(*p)) {
*p += 1;
return *p;
} else if (!pt_is_any_rule(*p)) {
return pt_advance(*p, true);
} else {
if (!pt_is_rule(*p, pn_kind)) {
return pt_advance(*p, true);
} else {
const byte *ptop;
*p = pt_rule_extract_top(*p, &ptop);
return ptop;
}
}
}
/*
const byte *pt_extract_id(const byte *p, qstr *qst) {
//assert(*p == MP_PT_ID_BASE);
*qst = p[1] | ((p[0] - MP_PT_ID_BASE) << 8);
return p + 2;
}
*/
const byte *pt_extract_const_obj(const byte *p, size_t *idx) {
assert(*p == MP_PT_CONST_OBJECT);
p += 1;
*idx = vuint_load(&p);
return p;
}
const byte *pt_get_small_int(const byte *p, mp_int_t *val) {
assert(*p == MP_PT_SMALL_INT);
*val = 0;
for (size_t i = 0; i < BYTES_PER_WORD; i++) {
*val |= (mp_int_t)*++p << (8 * i);
}
return p + 1;
}
mp_int_t pt_small_int_value(const byte *p) {
mp_int_t val;
pt_get_small_int(p, &val);
return val;
}
int pt_num_nodes(const byte *p, const byte *ptop) {
int n = 0;
while (p < ptop) {
n += 1;
p = pt_advance(p, true);
}
return n;
}
const byte *pt_next(const byte *p) {
return pt_advance(p, true);
}
const byte *pt_rule_first(const byte *p) {
return pt_advance(p, false);
}
#if 0
void pt_show(const byte *p, const byte *ptop) {
const byte *start = p;
while (p < ptop) {
printf("%04u ", (uint)(p - (byte*)start));
const byte *p2 = pt_advance(p, false);
for (const byte *p3 = p; p3 < p2; ++p3) {
printf("%02x ", *p3);
}
for (int i = 8 - (p2 - p); i > 0; --i) {
printf(" ");
}
switch (*p) {
case MP_PT_NULL:
printf("NULL\n");
break;
case MP_PT_TOKEN:
printf("TOKEN %u\n", p[1]);
break;
case MP_PT_SMALL_INT:
printf("SMALL_INT " INT_FMT "\n", pt_small_int_value(p));
break;
case MP_PT_STRING:
printf("STRING %s\n", qstr_str(p[1] | (p[2] << 8)));
break;
case MP_PT_BYTES:
printf("BYTES %s\n", qstr_str(p[1] | (p[2] << 8)));
break;
case MP_PT_CONST_OBJECT:
printf("CONST_OBJECT\n");
break;
default:
if (p[0] < MP_PT_RULE_BASE) {
// MP_PT_ID_BASE
printf("ID %s\n", qstr_str(p[1] | ((p[0] - MP_PT_ID_BASE) << 8)));
} else {
// MP_PT_RULE_BASE
byte rule_id = p[0] - MP_PT_RULE_BASE;
const byte *p4 = p + 1;
uint32_t src_line = vuint_load(&p4);
uint32_t n = vuint_load(&p4);
#if USE_RULE_NAME
printf("RULE %s line=%u bytes=%u\n", rules[rule_id]->rule_name, src_line, n);
#else
printf("RULE %d line=%u bytes=%u\n", rule_id, src_line, n);
#endif
}
break;
}
p = p2;
}
}
#endif
STATIC void pt_add_null(pt_t *pt) {
*pt_raw_add_blank(pt, 1) = MP_PT_NULL;
}
STATIC void pt_add_kind_byte(pt_t *pt, byte kind, byte b) {
byte *buf = pt_raw_add_blank(pt, 2);
buf[0] = kind;
buf[1] = b;
}
STATIC void pt_add_kind_qstr(pt_t *pt, byte kind, qstr qst) {
if (kind == MP_PT_ID_BASE) {
assert((qst >> 12) == 0);
byte *buf = pt_raw_add_blank(pt, 2);
buf[0] = MP_PT_ID_BASE + (qst >> 8);
buf[1] = qst;
} else {
assert((qst >> 16) == 0);
byte *buf = pt_raw_add_blank(pt, 3);
buf[0] = kind;
buf[1] = qst;
buf[2] = qst >> 8;
}
}
// valid for up to BYTES_PER_WORD=8
const byte pt_const_int0[] = {MP_PT_SMALL_INT, 0, 0, 0, 0, 0, 0, 0, 0};
STATIC void pt_add_kind_int(pt_t *pt, byte kind, mp_int_t val) {
byte *buf = pt_raw_add_blank(pt, 1 + BYTES_PER_WORD);
buf[0] = kind;
for (size_t i = 0; i < BYTES_PER_WORD; ++i) {
buf[i + 1] = val;
val >>= 8;
}
}
STATIC void pt_del_tail_bytes(pt_t *pt, size_t nbytes) {
vstr_cut_tail_bytes(&pt->vv, nbytes);
}
STATIC const byte *pt_del_byte(pt_t *pt, const byte *p) {
vstr_cut_out_bytes(&pt->vv, p - (byte*)pt->vv.buf, 1);
return p;
}
#if MICROPY_COMP_MODULE_CONST
#include "py/builtin.h"
STATIC const mp_rom_map_elem_t mp_constants_table[] = {
#if MICROPY_PY_UCTYPES
{ MP_ROM_QSTR(MP_QSTR_uctypes), MP_ROM_PTR(&mp_module_uctypes) },
#endif
// Extra constants as defined by a port
MICROPY_PORT_CONSTANTS
};
STATIC MP_DEFINE_CONST_MAP(mp_constants_map, mp_constants_table);
#endif
#if MICROPY_COMP_CONST_FOLDING
STATIC bool fold_constants(parser_t *parser, pt_t *pt, size_t pt_off, const rule_t *rule) {
(void)parser;
// this code does folding of arbitrary integer expressions, eg 1 + 2 * 3 + 4
// it does not do partial folding, eg 1 + 2 + x -> 3 + x
mp_int_t arg0;
if (rule->rule_id == RULE_expr
|| rule->rule_id == RULE_xor_expr
|| rule->rule_id == RULE_and_expr) {
// folding for binary ops: | ^ &
const byte *p = (byte*)pt->vv.buf + pt_off;
const byte *ptop = (byte*)pt->vv.buf + pt->vv.len;
if (*p != MP_PT_SMALL_INT) {
return false;
}
p = pt_get_small_int(p, &arg0);
while (p != ptop) {
if (*p != MP_PT_SMALL_INT) {
return false;
}
mp_int_t arg1;
p = pt_get_small_int(p, &arg1);
if (rule->rule_id == RULE_expr) {
// int | int
arg0 |= arg1;
} else if (rule->rule_id == RULE_xor_expr) {
// int ^ int
arg0 ^= arg1;
} else if (rule->rule_id == RULE_and_expr) {
// int & int
arg0 &= arg1;
}
}
} else if (rule->rule_id == RULE_shift_expr
|| rule->rule_id == RULE_arith_expr
|| rule->rule_id == RULE_term) {
// folding for binary ops: << >> + - * / % //
const byte *p = (byte*)pt->vv.buf + pt_off;
const byte *ptop = (byte*)pt->vv.buf + pt->vv.len;
if (*p != MP_PT_SMALL_INT) {
return false;
}
p = pt_get_small_int(p, &arg0);
while (p != ptop) {
p += 1; // it's a token
byte tok = *p++;
if (*p != MP_PT_SMALL_INT) {
return false;
}
mp_int_t arg1;
p = pt_get_small_int(p, &arg1);
if (tok == MP_TOKEN_OP_DBL_LESS) {
// int << int
if (arg1 >= (mp_int_t)BITS_PER_WORD
|| arg0 > (MP_SMALL_INT_MAX >> arg1)
|| arg0 < (MP_SMALL_INT_MIN >> arg1)) {
return false;
}
arg0 <<= arg1;
} else if (tok == MP_TOKEN_OP_DBL_MORE) {
// int >> int
if (arg1 >= (mp_int_t)BITS_PER_WORD) {
// Shifting to big amounts is underfined behavior
// in C and is CPU-dependent; propagate sign bit.
arg1 = BITS_PER_WORD - 1;
}
arg0 >>= arg1;
} else if (tok == MP_TOKEN_OP_PLUS) {
// int + int
arg0 += arg1;
} else if (tok == MP_TOKEN_OP_MINUS) {
// int - int
arg0 -= arg1;
} else if (tok == MP_TOKEN_OP_STAR) {
// int * int
if (mp_small_int_mul_overflow(arg0, arg1)) {
return false;
}
arg0 *= arg1;
} else if (tok == MP_TOKEN_OP_SLASH) {
// int / int
return false;
} else if (tok == MP_TOKEN_OP_PERCENT) {
// int % int
if (arg1 == 0) {
return false;
}
arg0 = mp_small_int_modulo(arg0, arg1);
} else {
assert(tok == MP_TOKEN_OP_DBL_SLASH); // should be
// int // int
if (arg1 == 0) {
return false;
}
arg0 = mp_small_int_floor_divide(arg0, arg1);
}
if (!MP_SMALL_INT_FITS(arg0)) {
return false;
}
}
} else if (rule->rule_id == RULE_factor_2) {
// folding for unary ops: + - ~
const byte *p = (byte*)pt->vv.buf + pt_off;
p += 1; // it's a token
byte tok = *p++;
if (*p != MP_PT_SMALL_INT) {
return false;
}
arg0 = pt_small_int_value(p);
if (tok == MP_TOKEN_OP_PLUS) {
// +int
} else if (tok == MP_TOKEN_OP_MINUS) {
// -int
arg0 = -arg0;
if (!MP_SMALL_INT_FITS(arg0)) {
return false;
}
} else {
assert(tok == MP_TOKEN_OP_TILDE); // should be
// ~int
arg0 = ~arg0;
}
#if 0&&MICROPY_COMP_CONST
} else if (rule->rule_id == RULE_expr_stmt) {
mp_parse_node_t pn1 = peek_result(parser, 0);
if (!MP_PARSE_NODE_IS_NULL(pn1)
&& !(MP_PARSE_NODE_IS_STRUCT_KIND(pn1, RULE_expr_stmt_augassign)
|| MP_PARSE_NODE_IS_STRUCT_KIND(pn1, RULE_expr_stmt_assign_list))) {
// this node is of the form <x> = <y>
mp_parse_node_t pn0 = peek_result(parser, 1);
if (MP_PARSE_NODE_IS_ID(pn0)
&& MP_PARSE_NODE_IS_STRUCT_KIND(pn1, RULE_power)
&& MP_PARSE_NODE_IS_ID(((mp_parse_node_struct_t*)pn1)->nodes[0])
&& MP_PARSE_NODE_LEAF_ARG(((mp_parse_node_struct_t*)pn1)->nodes[0]) == MP_QSTR_const
&& MP_PARSE_NODE_IS_STRUCT_KIND(((mp_parse_node_struct_t*)pn1)->nodes[1], RULE_trailer_paren)
&& MP_PARSE_NODE_IS_NULL(((mp_parse_node_struct_t*)pn1)->nodes[2])
) {
// code to assign dynamic constants: id = const(value)
// get the id
qstr id = MP_PARSE_NODE_LEAF_ARG(pn0);
// get the value
mp_parse_node_t pn_value = ((mp_parse_node_struct_t*)((mp_parse_node_struct_t*)pn1)->nodes[1])->nodes[0];
if (!MP_PARSE_NODE_IS_SMALL_INT(pn_value)) {
parser->parse_error = PARSE_ERROR_CONST;
return false;
}
mp_int_t value = MP_PARSE_NODE_LEAF_SMALL_INT(pn_value);
// store the value in the table of dynamic constants
mp_map_elem_t *elem = mp_map_lookup(&parser->consts, MP_OBJ_NEW_QSTR(id), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND);
assert(elem->value == MP_OBJ_NULL);
elem->value = MP_OBJ_NEW_SMALL_INT(value);
// replace const(value) with value
pop_result(parser);
push_result_node(parser, pn_value);
// finished folding this assignment, but we still want it to be part of the tree
return false;
}
}
return false;
#endif
#if 0&&MICROPY_COMP_MODULE_CONST
} else if (rule->rule_id == RULE_power) {
mp_parse_node_t pn0 = peek_result(parser, 2);
mp_parse_node_t pn1 = peek_result(parser, 1);
mp_parse_node_t pn2 = peek_result(parser, 0);
if (!(MP_PARSE_NODE_IS_ID(pn0)
&& MP_PARSE_NODE_IS_STRUCT_KIND(pn1, RULE_trailer_period)
&& MP_PARSE_NODE_IS_NULL(pn2))) {
return false;
}
// id1.id2
// look it up in constant table, see if it can be replaced with an integer
mp_parse_node_struct_t *pns1 = (mp_parse_node_struct_t*)pn1;
assert(MP_PARSE_NODE_IS_ID(pns1->nodes[0]));
qstr q_base = MP_PARSE_NODE_LEAF_ARG(pn0);
qstr q_attr = MP_PARSE_NODE_LEAF_ARG(pns1->nodes[0]);
mp_map_elem_t *elem = mp_map_lookup((mp_map_t*)&mp_constants_map, MP_OBJ_NEW_QSTR(q_base), MP_MAP_LOOKUP);
if (elem == NULL) {
return false;
}
mp_obj_t dest[2];
mp_load_method_maybe(elem->value, q_attr, dest);
if (!(MP_OBJ_IS_SMALL_INT(dest[0]) && dest[1] == MP_OBJ_NULL)) {
return false;
}
arg0 = MP_OBJ_SMALL_INT_VALUE(dest[0]);
#endif
} else {
return false;
}
// success folding this rule
pt_raw_truncate_at(pt, pt_off);
pt_add_kind_int(pt, MP_PT_SMALL_INT, arg0);
return true;
}
#endif
STATIC void pt_ins_rule(parser_t *parser, pt_t *pt, size_t pt_off, size_t src_line, const rule_t *rule, size_t num_args) {
(void)num_args;
// optimise away parenthesis around an expression if possible
if (rule->rule_id == RULE_atom_paren) {
// there should be just 1 arg for this rule
const byte *p = (byte*)pt->vv.buf + pt_off;
if (pt_is_null(p)) {
// need to keep parenthesis for ()
} else if (pt_is_rule(p, RULE_testlist_comp)) {
// need to keep parenthesis for (a, b, ...)
} else {
// parenthesis around a single expression, so it's just the expression
//printf("opt!\n");
return;
}
}
#if MICROPY_COMP_CONST_FOLDING
if (fold_constants(parser, pt, pt_off, rule)) {
// we folded this rule so return straight away
return;
}
#endif
#if 0
// TODO partial folding, eg 1 + 2 + x -> 3 + x
mp_int_t arg0;
if (rule->rule_id == RULE_expr
|| rule->rule_id == RULE_xor_expr
|| rule->rule_id == RULE_and_expr) {
// combined node folding for these rules
const byte *p = (byte*)pt->vv.buf + pt_off;
const byte *ptop = (byte*)pt->vv.buf + pt->vv.len;
if (*p != MP_PT_SMALL_INT) {
goto folding_fail;
}
p = pt_get_small_int(p, &arg0);
while (p != ptop) {
if (*p != MP_PT_SMALL_INT) {
goto folding_fail;
}
mp_int_t arg1;
p = pt_get_small_int(p, &arg1);
if (rule->rule_id == RULE_expr) {
// int | int
arg0 |= arg1;
} else if (rule->rule_id == RULE_xor_expr) {
// int ^ int
arg0 ^= arg1;
} else if (rule->rule_id == RULE_and_expr) {
// int & int
arg0 &= arg1;
}
if (!MP_SMALL_INT_FITS(arg0)) { // check needed?
goto folding_fail;
}
}
} else if (rule->rule_id == RULE_shift_expr
|| rule->rule_id == RULE_arith_expr
|| rule->rule_id == RULE_term) {
// combined node folding for these rules
const byte *p = (byte*)pt->vv.buf + pt_off;
const byte *ptop = (byte*)pt->vv.buf + pt->vv.len;
if (*p != MP_PT_SMALL_INT) {
goto folding_fail;
}
p = pt_get_small_int(p, &arg0);
while (p != ptop) {
p += 1; // it's a token
byte tok = *p++;
if (*p != MP_PT_SMALL_INT) {
goto folding_fail;
}
mp_int_t arg1;
p = pt_get_small_int(p, &arg1);
if (tok == MP_TOKEN_OP_DBL_LESS) {
// int << int
if (arg1 >= (mp_int_t)BITS_PER_WORD
|| arg0 > (MP_SMALL_INT_MAX >> arg1)
|| arg0 < (MP_SMALL_INT_MIN >> arg1)) {
goto folding_fail;
}
arg0 <<= arg1;
} else if (tok == MP_TOKEN_OP_DBL_MORE) {
// int >> int
if (arg1 >= (mp_int_t)BITS_PER_WORD) {
// Shifting to big amounts is underfined behavior
// in C and is CPU-dependent; propagate sign bit.
arg1 = BITS_PER_WORD - 1;
}
arg0 >>= arg1;
} else if (tok == MP_TOKEN_OP_PLUS) {
// int + int
arg0 += arg1;
} else if (tok == MP_TOKEN_OP_MINUS) {
// int - int
arg0 -= arg1;
} else if (tok == MP_TOKEN_OP_STAR) {
// int * int
if (mp_small_int_mul_overflow(arg0, arg1)) {
goto folding_fail;
}
arg0 *= arg1;
} else if (tok == MP_TOKEN_OP_SLASH) {
// int / int
goto folding_fail;
} else if (tok == MP_TOKEN_OP_PERCENT) {
// int % int
if (arg1 == 0) {
goto folding_fail;
}
arg0 = mp_small_int_modulo(arg0, arg1);
} else {
assert(tok == MP_TOKEN_OP_DBL_SLASH); // should be
// int // int
if (arg1 == 0) {
goto folding_fail;
}
arg0 = mp_small_int_floor_divide(arg0, arg1);
}
if (!MP_SMALL_INT_FITS(arg0)) {
goto folding_fail;
}
}
} else if (rule->rule_id == RULE_factor_2) {
const byte *p = (byte*)pt->vv.buf + pt_off;
p += 1; // it's a token
byte tok = *p++;
if (*p != MP_PT_SMALL_INT) {
goto folding_fail;
}
arg0 = pt_small_int_value(p);
if (tok == MP_TOKEN_OP_PLUS) {
// +int
} else if (tok == MP_TOKEN_OP_MINUS) {
// -int
arg0 = -arg0;
if (!MP_SMALL_INT_FITS(arg0)) {
goto folding_fail;
}
} else {
assert(tok == MP_TOKEN_OP_TILDE); // should be
// ~int
arg0 = ~arg0;
}
} else {
goto folding_fail;
}
// success folding this rule
pt_raw_truncate_at(pt, pt_off);
pt_add_kind_int(pt, MP_PT_SMALL_INT, arg0);
return;
folding_fail:;
#endif
int extra_node = 0;
/*
if (ADD_BLANK_NODE(rule)) {
extra_node = 1 + BYTES_PER_WORD; // for small int node
}
*/
size_t nbytes = pt->vv.len + extra_node - pt_off;
int nb1 = vuint_nbytes(src_line);
int nb2 = vuint_nbytes(nbytes);
byte *dest = (byte*)pt_raw_ins_blank(pt, pt_off, 1 + nb1 + nb2 + extra_node);
dest[0] = MP_PT_RULE_BASE + rule->rule_id;
vuint_store(dest + 1, nb1, src_line);
vuint_store(dest + 1 + nb1, nb2, nbytes);
// insert small int node for scope index
if (extra_node != 0) {
dest[1 + nb1 + nb2] = MP_PT_SMALL_INT;
size_t val = ++parser->cur_scope_id;
for (size_t i = 0; i < BYTES_PER_WORD; ++i) {
dest[1 + nb1 + nb2 + 1 + i] = val;
val >>= 8;
}
}
}
STATIC void make_node_const_object(parser_t *parser, pt_t *pt, mp_obj_t obj) {
int nb = vuint_nbytes(parser->co_used);
byte *buf = pt_raw_add_blank(pt, 1 + nb);
buf[0] = MP_PT_CONST_OBJECT;
vuint_store(buf + 1, nb, parser->co_used);
if (parser->co_used >= parser->co_alloc) {
// TODO use m_renew_maybe
size_t alloc = parser->co_alloc + 8;
parser->co_data = m_renew(mp_uint_t, parser->co_data, parser->co_alloc, alloc);
parser->co_alloc = alloc;
}
parser->co_data[parser->co_used++] = (mp_uint_t)obj;
}
STATIC void make_node_string_bytes(parser_t *parser, pt_t *pt, mp_token_kind_t tok, const char *str, size_t len) {
mp_obj_t o;
if (tok == MP_TOKEN_STRING) {
o = mp_obj_new_str(str, len, false);
} else {
o = mp_obj_new_bytes((const byte*)str, len);
}
make_node_const_object(parser, pt, o);
}
STATIC bool pt_add_token(parser_t *parser, pt_t *pt) {
mp_lexer_t *lex = parser->lexer;
if (lex->tok_kind == MP_TOKEN_NAME) {
qstr id = qstr_from_strn(lex->vstr.buf, lex->vstr.len);
#if MICROPY_COMP_CONST
// lookup identifier in table of dynamic constants
mp_map_elem_t *elem = mp_map_lookup(&parser->consts, MP_OBJ_NEW_QSTR(id), MP_MAP_LOOKUP);
if (elem != NULL) {
pt_add_kind_int(pt, MP_PT_SMALL_INT, MP_OBJ_SMALL_INT_VALUE(elem->value));
} else
#endif
{
pt_add_kind_qstr(pt, MP_PT_ID_BASE, id);
}
} else if (lex->tok_kind == MP_TOKEN_INTEGER) {
mp_obj_t o = mp_parse_num_integer(lex->vstr.buf, lex->vstr.len, 0, lex);
if (MP_OBJ_IS_SMALL_INT(o)) {
pt_add_kind_int(pt, MP_PT_SMALL_INT, MP_OBJ_SMALL_INT_VALUE(o));
} else {
make_node_const_object(parser, pt, o);
}
} else if (lex->tok_kind == MP_TOKEN_FLOAT_OR_IMAG) {
mp_obj_t o = mp_parse_num_decimal(lex->vstr.buf, lex->vstr.len, true, false, lex);
make_node_const_object(parser, pt, o);
} else if (lex->tok_kind == MP_TOKEN_STRING || lex->tok_kind == MP_TOKEN_BYTES) {
// join adjacent string/bytes literals
mp_token_kind_t tok_kind = lex->tok_kind;
vstr_t vstr;
vstr_init(&vstr, lex->vstr.len);
do {
vstr_add_strn(&vstr, lex->vstr.buf, lex->vstr.len);
mp_lexer_to_next(lex);
} while (lex->tok_kind == tok_kind);
if (lex->tok_kind == MP_TOKEN_STRING || lex->tok_kind == MP_TOKEN_BYTES) {
return false;
}
// Don't automatically intern all strings/bytes. doc strings (which are usually large)
// will be discarded by the compiler, and so we shouldn't intern them.
qstr qst = MP_QSTR_NULL;
if (vstr.len <= MICROPY_ALLOC_PARSE_INTERN_STRING_LEN) {
// intern short strings
qst = qstr_from_strn(vstr.buf, vstr.len);
} else {
// check if this string is already interned
qst = qstr_find_strn(vstr.buf, vstr.len);
}
if (qst != MP_QSTR_NULL) {
// qstr exists, make a leaf node
pt_add_kind_qstr(pt, tok_kind == MP_TOKEN_STRING ? MP_PT_STRING : MP_PT_BYTES, qst);
} else {
// not interned, make a node holding a pointer to the string/bytes data
make_node_string_bytes(parser, pt, tok_kind, vstr.buf, vstr.len);
}
vstr_clear(&vstr);
return true;
} else {
pt_add_kind_byte(pt, MP_PT_TOKEN, lex->tok_kind);
}
mp_lexer_to_next(lex);
return true;
}
const byte *pt_rule_extract_top(const byte *p, const byte **ptop) {
assert(*p >= MP_PT_RULE_BASE);
p++;
vuint_load(&p);
size_t nbytes = vuint_load(&p);
*ptop = p + nbytes;
return p;
}
const byte *pt_rule_extract(const byte *p, size_t *rule_id, size_t *src_line, const byte **ptop) {
assert(*p >= MP_PT_RULE_BASE);
*rule_id = *p++ - MP_PT_RULE_BASE;
*src_line = vuint_load(&p);
size_t nbytes = vuint_load(&p);
*ptop = p + nbytes;
return p;
}
bool pt_is_rule_empty(const byte *p) {
const byte *ptop;
p = pt_rule_extract_top(p, &ptop);
return p == ptop;
}
mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
// initialise parser and allocate memory for its stacks
parser_t parser;
parser.parse_error = PARSE_ERROR_NONE;
parser.rule_stack_alloc = MICROPY_ALLOC_PARSE_RULE_INIT;
parser.rule_stack_top = 0;
parser.rule_stack = m_new_maybe(rule_stack_t, parser.rule_stack_alloc);
parser.cur_scope_id = 0;
parser.co_alloc = 0;
parser.co_used = 0;
parser.co_data = NULL;
parser.lexer = lex;
parser.tree.chunk = NULL;
#if MICROPY_COMP_CONST
mp_map_init(&parser.consts, 0);
#endif
// check if we could allocate the stacks
if (parser.rule_stack == NULL) {
goto memory_error;
}
// work out the top-level rule to use, and push it on the stack
size_t top_level_rule;
switch (input_kind) {
case MP_PARSE_SINGLE_INPUT: top_level_rule = RULE_single_input; break;
case MP_PARSE_EVAL_INPUT: top_level_rule = RULE_eval_input; break;
default: top_level_rule = RULE_file_input;
}
push_rule(&parser, lex->tok_line, rules[top_level_rule], 0, 0);
// parse!
size_t n, i; // state for the current rule
size_t pt_off = 0; // state for the current rule
size_t rule_src_line; // source line for the first token matched by the current rule
bool backtrack = false;
const rule_t *rule = NULL;
pt_t *pt = pt_new();
for (;;) {
next_rule:
if (parser.rule_stack_top == 0 || parser.parse_error) {
break;
}
pop_rule(&parser, &rule, &i, &rule_src_line, &pt_off);
n = rule->act & RULE_ACT_ARG_MASK;
if (i == 0) {
pt_off = pt->vv.len;
}
/*
// debugging
printf("depth=%d ", parser.rule_stack_top);
for (int j = 0; j < parser.rule_stack_top; ++j) {
printf(" ");
}
printf("%s n=%d i=%d bt=%d\n", rule->rule_name, n, i, backtrack);
*/
switch (rule->act & RULE_ACT_KIND_MASK) {
case RULE_ACT_OR:
if (i > 0 && !backtrack) {
goto next_rule;
} else {
backtrack = false;
}
for (; i < n; ++i) {
uint16_t kind = rule->arg[i] & RULE_ARG_KIND_MASK;
if (kind == RULE_ARG_TOK) {
if (lex->tok_kind == (rule->arg[i] & RULE_ARG_ARG_MASK)) {
if (!pt_add_token(&parser, pt)) {
goto syntax_error;
}
goto next_rule;
}
} else {
assert(kind == RULE_ARG_RULE);
if (i + 1 < n) {
push_rule(&parser, rule_src_line, rule, i + 1, pt_off); // save this or-rule
}
push_rule_from_arg(&parser, rule->arg[i]); // push child of or-rule
goto next_rule;
}
}
backtrack = true;
break;
case RULE_ACT_AND: {
// failed, backtrack if we can, else syntax error
if (backtrack) {
assert(i > 0);
if ((rule->arg[i - 1] & RULE_ARG_KIND_MASK) == RULE_ARG_OPT_RULE) {
// an optional rule that failed, so continue with next arg
pt_add_null(pt);
backtrack = false;
} else {
// a mandatory rule that failed, so propagate backtrack
if (i > 1) {
// already eaten tokens so can't backtrack
goto syntax_error;
} else {
goto next_rule;
}
}
}
// progress through the rule
for (; i < n; ++i) {
switch (rule->arg[i] & RULE_ARG_KIND_MASK) {
case RULE_ARG_TOK: {
// need to match a token
mp_token_kind_t tok_kind = rule->arg[i] & RULE_ARG_ARG_MASK;
if (lex->tok_kind == tok_kind) {
// matched token
if (tok_kind == MP_TOKEN_NAME) {
pt_add_kind_qstr(pt, MP_PT_ID_BASE, qstr_from_strn(lex->vstr.buf, lex->vstr.len));
}
if (i == 0 && ADD_BLANK_NODE(rule)) {
pt_add_kind_int(pt, MP_PT_SMALL_INT, ++parser.cur_scope_id);
}
mp_lexer_to_next(lex);
} else {
// failed to match token
if (i > 0) {
// already eaten tokens so can't backtrack
goto syntax_error;
} else {
// this rule failed, so backtrack
backtrack = true;
goto next_rule;
}
}
break;
}
case RULE_ARG_RULE:
case RULE_ARG_OPT_RULE:
default:
push_rule(&parser, rule_src_line, rule, i + 1, pt_off); // save this and-rule
push_rule_from_arg(&parser, rule->arg[i]); // push child of and-rule
goto next_rule;
}
}
assert(i == n);
// matched the rule, so now build the corresponding parse_node
// count number of arguments for the parse_node
i = 0;
bool emit_rule = false;
/*
for (size_t x = 0; x < n; ++x) {
if ((rule->arg[x] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
mp_token_kind_t tok_kind = rule->arg[x] & RULE_ARG_ARG_MASK;
if (tok_kind >= MP_TOKEN_NAME) {
emit_rule = true;
}
if (tok_kind == MP_TOKEN_NAME) {
// only tokens which were names are pushed to stack
i += 1;
}
} else {
// rules are always pushed
i += 1;
}
}
*/
for (size_t x = 0; x < n; ++x) {
if ((rule->arg[x] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
mp_token_kind_t tok_kind = rule->arg[x] & RULE_ARG_ARG_MASK;
if (tok_kind >= MP_TOKEN_NAME) {
emit_rule = true;
}
}
}
for (const byte *p = (byte*)pt->vv.buf + pt_off; p < (byte*)pt->vv.buf + pt->vv.len;) {
i += 1;
p = pt_advance(p, true);
}
#if 0 && !MICROPY_ENABLE_DOC_STRING
// this code discards lonely statements, such as doc strings
if (input_kind != MP_PARSE_SINGLE_INPUT && rule->rule_id == RULE_expr_stmt && peek_result(&parser, 0) == MP_PARSE_NODE_NULL) {
mp_parse_node_t p = peek_result(&parser, 1);
if ((MP_PARSE_NODE_IS_LEAF(p) && !MP_PARSE_NODE_IS_ID(p)) || MP_PARSE_NODE_IS_STRUCT_KIND(p, RULE_string)) {
pop_result(&parser); // MP_PARSE_NODE_NULL
mp_parse_node_t pn = pop_result(&parser); // possibly RULE_string
if (MP_PARSE_NODE_IS_STRUCT(pn)) {
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t *)pn;
if (MP_PARSE_NODE_STRUCT_KIND(pns) == RULE_string) {
m_del(char, (char*)pns->nodes[0], (mp_uint_t)pns->nodes[1]);
}
}
push_result_rule(&parser, rule_src_line, rules[RULE_pass_stmt], 0);
break;
}
}
#endif
// always emit these rules, even if they have only 1 argument
if (rule->rule_id == RULE_expr_stmt || rule->rule_id == RULE_yield_stmt) {
emit_rule = true;
}
// if a rule has the RULE_ACT_ALLOW_IDENT bit set then this
// rule should not be emitted if it has only 1 argument
if (rule->act & RULE_ACT_ALLOW_IDENT) {
emit_rule = false;
}
// always emit these rules, and add an extra blank node at the end (to be used by the compiler to store data)
if (ADD_BLANK_NODE(rule)) {
emit_rule = true;
// TODO
//add_result_node(&parser, MP_PARSE_NODE_NULL);
//i += 1;
}
// count number of non-null nodes
size_t num_not_null = 0;
size_t num_trail_null = 0;
{ const byte *p = (byte*)pt->vv.buf + pt_off;
for (size_t x = 0; x < i; ++x) {
if (*p != MP_PT_NULL) {
num_not_null += 1;
num_trail_null = 0;
} else {
num_trail_null += 1;
}
p = pt_advance(p, true);
}}
if (emit_rule || num_not_null != 1) {
// need to add rule when num_not_null == 0 for, eg, atom_paren, testlist_comp_3b
pt_del_tail_bytes(pt, num_trail_null); // remove trailing null nodes, they are store implicitly
pt_ins_rule(&parser, pt, pt_off, rule_src_line, rule, i - num_trail_null);
} else {
// single result, leave it on stack
const byte *p = (byte*)pt->vv.buf + pt_off;
for (size_t x = 0; x < i; ++x) {
if (*p == MP_PT_NULL) {
p = pt_del_byte(pt, p);
} else {
p = pt_advance(p, true);
}
}
}
break;
}
case RULE_ACT_LIST:
default: // nothing else
{
// n=2 is: item item*
// n=1 is: item (sep item)*
// n=3 is: item (sep item)* [sep]
bool had_trailing_sep;
if (backtrack) {
list_backtrack:
had_trailing_sep = false;
if (n == 2) {
if (i == 1) {
// fail on item, first time round; propagate backtrack
goto next_rule;
} else {
// fail on item, in later rounds; finish with this rule
backtrack = false;
}
} else {
if (i == 1) {
// fail on item, first time round; propagate backtrack
goto next_rule;
} else if ((i & 1) == 1) {
// fail on item, in later rounds; have eaten tokens so can't backtrack
if (n == 3) {
// list allows trailing separator; finish parsing list
had_trailing_sep = true;
backtrack = false;
} else {
// list doesn't allowing trailing separator; fail
goto syntax_error;
}
} else {
// fail on separator; finish parsing list
backtrack = false;
}
}
} else {
for (;;) {
size_t arg = rule->arg[i & 1 & n];
switch (arg & RULE_ARG_KIND_MASK) {
case RULE_ARG_TOK:
if (lex->tok_kind == (arg & RULE_ARG_ARG_MASK)) {
if (i & 1 & n) {
// separators which are tokens are not pushed to result stack
mp_lexer_to_next(lex);
} else {
pt_add_token(&parser, pt);
}
// got element of list, so continue parsing list
i += 1;
} else {
// couldn't get element of list
i += 1;
backtrack = true;
goto list_backtrack;
}
break;
case RULE_ARG_RULE:
rule_list_no_other_choice:
push_rule(&parser, rule_src_line, rule, i + 1, pt_off); // save this list-rule
push_rule_from_arg(&parser, arg); // push child of list-rule
goto next_rule;
default:
assert(0);
goto rule_list_no_other_choice; // to help flow control analysis
}
}
}
assert(i >= 1);
// compute number of elements in list, result in i
i -= 1;
if ((n & 1) && (rule->arg[1] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
// don't count separators when they are tokens
i = (i + 1) / 2;
}
if (i == 1) {
// list matched single item
if (had_trailing_sep) {
// if there was a trailing separator, make a list of a single item
pt_ins_rule(&parser, pt, pt_off, rule_src_line, rule, i);
} else {
// just leave single item on stack (ie don't wrap in a list)
}
} else {
pt_ins_rule(&parser, pt, pt_off, rule_src_line, rule, i);
}
break;
}
}
}
#if MICROPY_COMP_CONST
mp_map_deinit(&parser.consts);
#endif
#if 0
pt_show((const byte*)pt->vv.buf, (const byte*)pt->vv.buf + pt->vv.len);
{
size_t n_pool, n_qstr, n_str_data_bytes, n_total_bytes;
qstr_pool_info(&n_pool, &n_qstr, &n_str_data_bytes, &n_total_bytes);
printf("qstr pool: n_pool=" UINT_FMT ", n_qstr=" UINT_FMT ", n_str_data_bytes="
UINT_FMT ", n_total_bytes=" UINT_FMT "\n",
n_pool, n_qstr, n_str_data_bytes, n_total_bytes);
}
#endif
mp_obj_t exc;
if (parser.parse_error) {
#if MICROPY_COMP_CONST
if (parser.parse_error == PARSE_ERROR_CONST) {
exc = mp_obj_new_exception_msg(&mp_type_SyntaxError,
"constant must be an integer");
} else
#endif
{
assert(parser.parse_error == PARSE_ERROR_MEMORY);
memory_error:
exc = mp_obj_new_exception_msg(&mp_type_MemoryError,
"parser could not allocate enough memory");
}
parser.tree.root = NULL;
} else if (
lex->tok_kind != MP_TOKEN_END // check we are at the end of the token stream
|| pt->vv.len == 0 // check that we got a node (can fail on empty input)
) {
syntax_error:
if (lex->tok_kind == MP_TOKEN_INDENT) {
exc = mp_obj_new_exception_msg(&mp_type_IndentationError,
"unexpected indent");
} else if (lex->tok_kind == MP_TOKEN_DEDENT_MISMATCH) {
exc = mp_obj_new_exception_msg(&mp_type_IndentationError,
"unindent does not match any outer indentation level");
} else if (lex->tok_kind == MP_TOKEN_STRING || lex->tok_kind == MP_TOKEN_BYTES) {
exc = mp_obj_new_exception_msg(&mp_type_SyntaxError,
"cannot mix bytes and nonbytes literals");
} else {
exc = mp_obj_new_exception_msg(&mp_type_SyntaxError,
"invalid syntax");
}
parser.tree.root = NULL;
} else {
// no errors
//result_stack_show(parser);
//printf("rule stack alloc: %d\n", parser.rule_stack_alloc);
//printf("result stack alloc: %d\n", parser.result_stack_alloc);
//printf("number of parse nodes allocated: %d\n", num_parse_nodes_allocated);
// add number of scopes
pt_add_kind_int(pt, MP_PT_SMALL_INT, parser.cur_scope_id + 1);
// get the root parse node that we created
//assert(parser.result_stack_top == 1);
exc = MP_OBJ_NULL;
parser.tree.root = (byte*)pt->vv.buf;
parser.tree.co_data = parser.co_data;
}
// free the memory that we don't need anymore
m_del(rule_stack_t, parser.rule_stack, parser.rule_stack_alloc);
// we also free the lexer on behalf of the caller (see below)
if (exc != MP_OBJ_NULL) {
// had an error so raise the exception
// add traceback to give info about file name and location
// we don't have a 'block' name, so just pass the NULL qstr to indicate this
mp_obj_exception_add_traceback(exc, lex->source_name, lex->tok_line, MP_QSTR_NULL);
mp_lexer_free(lex);
nlr_raise(exc);
} else {
mp_lexer_free(lex);
return parser.tree;
}
}
void mp_parse_tree_clear(mp_parse_tree_t *tree) {
mp_parse_chunk_t *chunk = tree->chunk;
while (chunk != NULL) {
mp_parse_chunk_t *next = chunk->union_.next;
m_del(byte, chunk, sizeof(mp_parse_chunk_t) + chunk->alloc);
chunk = next;
}
}
#endif // MICROPY_ENABLE_COMPILER && MICROPY_USE_SMALL_HEAP_COMPILER
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