566 lines
22 KiB
C
566 lines
22 KiB
C
#include <unistd.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <assert.h>
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#include "misc.h"
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#include "lexer.h"
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#include "machine.h"
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#include "parse.h"
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#define RULE_ACT_KIND_MASK (0xf0)
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#define RULE_ACT_ARG_MASK (0x0f)
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#define RULE_ACT_OR (0x10)
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#define RULE_ACT_AND (0x20)
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#define RULE_ACT_LIST (0x30)
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#define RULE_ARG_BLANK (0x0000)
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#define RULE_ARG_KIND_MASK (0xf000)
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#define RULE_ARG_ARG_MASK (0x0fff)
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#define RULE_ARG_TOK (0x1000)
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#define RULE_ARG_RULE (0x2000)
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#define RULE_ARG_OPT_TOK (0x3000)
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#define RULE_ARG_OPT_RULE (0x4000)
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// (un)comment to use rule names; for debugging
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//#define USE_RULE_NAME (1)
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typedef struct _rule_t {
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byte rule_id;
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byte act;
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#ifdef USE_RULE_NAME
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const char *rule_name;
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#endif
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uint16_t arg[];
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} rule_t;
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enum {
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RULE_none = 0,
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#define DEF_RULE(rule, comp, kind, arg...) RULE_##rule,
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#include "grammar.h"
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#undef DEF_RULE
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RULE_maximum_number_of,
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};
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#define or(n) (RULE_ACT_OR | n)
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#define and(n) (RULE_ACT_AND | n)
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#define one_or_more (RULE_ACT_LIST | 2)
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#define list (RULE_ACT_LIST | 1)
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#define list_with_end (RULE_ACT_LIST | 3)
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#define tok(t) (RULE_ARG_TOK | PY_TOKEN_##t)
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#define rule(r) (RULE_ARG_RULE | RULE_##r)
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#define opt_tok(t) (RULE_ARG_OPT_TOK | PY_TOKEN_##t)
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#define opt_rule(r) (RULE_ARG_OPT_RULE | RULE_##r)
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#ifdef USE_RULE_NAME
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#define DEF_RULE(rule, comp, kind, arg...) static rule_t rule_##rule = { RULE_##rule, kind, #rule, { arg } };
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#else
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#define DEF_RULE(rule, comp, kind, arg...) static rule_t rule_##rule = { RULE_##rule, kind, { arg } };
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#endif
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#include "grammar.h"
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#undef or
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#undef and
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#undef list
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#undef list_with_end
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#undef tok
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#undef rule
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#undef opt_tok
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#undef opt_rule
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#undef one_or_more
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#undef DEF_RULE
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static rule_t *rules[] = {
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NULL,
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#define DEF_RULE(rule, comp, kind, arg...) &rule_##rule,
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#include "grammar.h"
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#undef DEF_RULE
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};
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typedef struct _rule_stack_t {
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byte rule_id;
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int32_t arg_i; // what should be the size and signedness?
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} rule_stack_t;
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typedef struct _parser_t {
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uint rule_stack_alloc;
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uint rule_stack_top;
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rule_stack_t *rule_stack;
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uint result_stack_top;
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py_parse_node_t *result_stack;
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} parser_t;
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static void push_rule(parser_t *parser, rule_t *rule, int arg_i) {
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if (parser->rule_stack_top >= parser->rule_stack_alloc) {
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parser->rule_stack_alloc *= 2;
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parser->rule_stack = m_renew(rule_stack_t, parser->rule_stack, parser->rule_stack_alloc);
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}
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parser->rule_stack[parser->rule_stack_top].rule_id = rule->rule_id;
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parser->rule_stack[parser->rule_stack_top].arg_i = arg_i;
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parser->rule_stack_top += 1;
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}
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static void push_rule_from_arg(parser_t *parser, uint arg) {
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assert((arg & RULE_ARG_KIND_MASK) == RULE_ARG_RULE || (arg & RULE_ARG_KIND_MASK) == RULE_ARG_OPT_RULE);
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uint rule_id = arg & RULE_ARG_ARG_MASK;
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assert(rule_id < RULE_maximum_number_of);
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push_rule(parser, rules[rule_id], 0);
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}
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static void pop_rule(parser_t *parser, rule_t **rule, uint *arg_i) {
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parser->rule_stack_top -= 1;
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*rule = rules[parser->rule_stack[parser->rule_stack_top].rule_id];
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*arg_i = parser->rule_stack[parser->rule_stack_top].arg_i;
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}
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py_parse_node_t py_parse_node_new_leaf(machine_int_t kind, machine_int_t arg) {
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return (py_parse_node_t)(kind | (arg << 4));
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}
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int num_parse_nodes_allocated = 0;
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py_parse_node_struct_t *parse_node_new_struct(int rule_id, int num_args) {
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py_parse_node_struct_t *pn = m_malloc(sizeof(py_parse_node_struct_t) + num_args * sizeof(py_parse_node_t));
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pn->source = 0; // TODO
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pn->kind_num_nodes = (rule_id & 0xff) | (num_args << 8);
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num_parse_nodes_allocated += 1;
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return pn;
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}
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void parse_node_show(py_parse_node_t pn, int indent) {
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for (int i = 0; i < indent; i++) {
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printf(" ");
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}
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if (PY_PARSE_NODE_IS_NULL(pn)) {
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printf("NULL\n");
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} else if (PY_PARSE_NODE_IS_LEAF(pn)) {
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int arg = PY_PARSE_NODE_LEAF_ARG(pn);
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switch (PY_PARSE_NODE_LEAF_KIND(pn)) {
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case PY_PARSE_NODE_ID: printf("id(%s)\n", qstr_str(arg)); break;
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case PY_PARSE_NODE_SMALL_INT: printf("int(%d)\n", arg); break;
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case PY_PARSE_NODE_INTEGER: printf("int(%s)\n", qstr_str(arg)); break;
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case PY_PARSE_NODE_DECIMAL: printf("dec(%s)\n", qstr_str(arg)); break;
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case PY_PARSE_NODE_STRING: printf("str(%s)\n", qstr_str(arg)); break;
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case PY_PARSE_NODE_BYTES: printf("bytes(%s)\n", qstr_str(arg)); break;
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case PY_PARSE_NODE_TOKEN: printf("tok(%d)\n", arg); break;
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default: assert(0);
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}
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} else {
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py_parse_node_struct_t *pns2 = (py_parse_node_struct_t*)pn;
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int n = pns2->kind_num_nodes >> 8;
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#ifdef USE_RULE_NAME
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printf("%s(%d) (n=%d)\n", rules[PY_PARSE_NODE_STRUCT_KIND(pns2)]->rule_name, PY_PARSE_NODE_STRUCT_KIND(pns2), n);
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#else
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printf("rule(%u) (n=%d)\n", (uint)PY_PARSE_NODE_STRUCT_KIND(pns2), n);
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#endif
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for (int i = 0; i < n; i++) {
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parse_node_show(pns2->nodes[i], indent + 2);
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}
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}
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}
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/*
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static void result_stack_show(parser_t *parser) {
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printf("result stack, most recent first\n");
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for (int i = parser->result_stack_top - 1; i >= 0; i--) {
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parse_node_show(parser->result_stack[i], 0);
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}
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}
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*/
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static py_parse_node_t pop_result(parser_t *parser) {
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assert(parser->result_stack_top > 0);
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return parser->result_stack[--parser->result_stack_top];
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}
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static py_parse_node_t peek_result(parser_t *parser, int pos) {
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assert(parser->result_stack_top > pos);
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return parser->result_stack[parser->result_stack_top - 1 - pos];
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}
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static void push_result_node(parser_t *parser, py_parse_node_t pn) {
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parser->result_stack[parser->result_stack_top++] = pn;
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}
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static void push_result_token(parser_t *parser, const py_lexer_t *lex) {
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const py_token_t *tok = py_lexer_cur(lex);
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py_parse_node_t pn;
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if (tok->kind == PY_TOKEN_NAME) {
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pn = py_parse_node_new_leaf(PY_PARSE_NODE_ID, qstr_from_strn_copy(tok->str, tok->len));
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} else if (tok->kind == PY_TOKEN_NUMBER) {
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bool dec = false;
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bool small_int = true;
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int int_val = 0;
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int len = tok->len;
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const char *str = tok->str;
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int base = 10;
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int i = 0;
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if (len >= 3 && str[0] == '0') {
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if (str[1] == 'o' || str[1] == 'O') {
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// octal
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base = 8;
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i = 2;
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} else if (str[1] == 'x' || str[1] == 'X') {
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// hexadecimal
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base = 16;
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i = 2;
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} else if (str[1] == 'b' || str[1] == 'B') {
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// binary
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base = 2;
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i = 2;
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}
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}
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for (; i < len; i++) {
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if (g_unichar_isdigit(str[i]) && str[i] - '0' < base) {
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int_val = base * int_val + str[i] - '0';
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} else if (base == 16 && 'a' <= str[i] && str[i] <= 'f') {
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int_val = base * int_val + str[i] - 'a' + 10;
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} else if (base == 16 && 'F' <= str[i] && str[i] <= 'F') {
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int_val = base * int_val + str[i] - 'A' + 10;
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} else if (str[i] == '.' || str[i] == 'e' || str[i] == 'E') {
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dec = true;
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break;
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} else {
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small_int = false;
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break;
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}
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}
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if (dec) {
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pn = py_parse_node_new_leaf(PY_PARSE_NODE_DECIMAL, qstr_from_strn_copy(str, len));
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} else if (small_int && -0x10000000 <= int_val && int_val <= 0xfffffff) { // XXX check this range formula!
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pn = py_parse_node_new_leaf(PY_PARSE_NODE_SMALL_INT, int_val);
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} else {
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pn = py_parse_node_new_leaf(PY_PARSE_NODE_INTEGER, qstr_from_strn_copy(str, len));
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}
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} else if (tok->kind == PY_TOKEN_STRING) {
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pn = py_parse_node_new_leaf(PY_PARSE_NODE_STRING, qstr_from_strn_copy(tok->str, tok->len));
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} else if (tok->kind == PY_TOKEN_BYTES) {
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pn = py_parse_node_new_leaf(PY_PARSE_NODE_BYTES, qstr_from_strn_copy(tok->str, tok->len));
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} else {
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pn = py_parse_node_new_leaf(PY_PARSE_NODE_TOKEN, tok->kind);
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}
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push_result_node(parser, pn);
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}
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static void push_result_rule(parser_t *parser, rule_t *rule, int num_args) {
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py_parse_node_struct_t *pn = parse_node_new_struct(rule->rule_id, num_args);
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for (int i = num_args; i > 0; i--) {
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pn->nodes[i - 1] = pop_result(parser);
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}
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push_result_node(parser, (py_parse_node_t)pn);
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}
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py_parse_node_t py_parse(py_lexer_t *lex, int wanted_rule) {
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wanted_rule = RULE_file_input;
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parser_t *parser = m_new(parser_t, 1);
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parser->rule_stack_alloc = 64;
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parser->rule_stack_top = 0;
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parser->rule_stack = m_new(rule_stack_t, parser->rule_stack_alloc);
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parser->result_stack = m_new(py_parse_node_t, 1000);
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parser->result_stack_top = 0;
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push_rule(parser, rules[wanted_rule], 0);
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uint n, i;
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bool backtrack = false;
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rule_t *rule;
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py_token_kind_t tok_kind;
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bool emit_rule;
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bool had_trailing_sep;
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for (;;) {
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next_rule:
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if (parser->rule_stack_top == 0) {
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break;
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}
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pop_rule(parser, &rule, &i);
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n = rule->act & RULE_ACT_ARG_MASK;
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/*
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// debugging
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printf("depth=%d ", parser->rule_stack_top);
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for (int j = 0; j < parser->rule_stack_top; ++j) {
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printf(" ");
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}
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printf("%s n=%d i=%d bt=%d\n", rule->rule_name, n, i, backtrack);
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*/
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switch (rule->act & RULE_ACT_KIND_MASK) {
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case RULE_ACT_OR:
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if (i > 0 && !backtrack) {
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goto next_rule;
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} else {
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backtrack = false;
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}
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for (; i < n - 1; ++i) {
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switch (rule->arg[i] & RULE_ARG_KIND_MASK) {
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case RULE_ARG_TOK:
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if (py_lexer_is_kind(lex, rule->arg[i] & RULE_ARG_ARG_MASK)) {
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push_result_token(parser, lex);
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py_lexer_to_next(lex);
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goto next_rule;
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}
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break;
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case RULE_ARG_RULE:
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push_rule(parser, rule, i + 1);
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push_rule_from_arg(parser, rule->arg[i]);
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goto next_rule;
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default:
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assert(0);
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}
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}
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if ((rule->arg[i] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
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if (py_lexer_is_kind(lex, rule->arg[i] & RULE_ARG_ARG_MASK)) {
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push_result_token(parser, lex);
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py_lexer_to_next(lex);
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} else {
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backtrack = true;
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goto next_rule;
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}
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} else {
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push_rule_from_arg(parser, rule->arg[i]);
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}
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break;
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case RULE_ACT_AND:
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// failed, backtrack if we can, else syntax error
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if (backtrack) {
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assert(i > 0);
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if ((rule->arg[i - 1] & RULE_ARG_KIND_MASK) == RULE_ARG_OPT_RULE) {
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// an optional rule that failed, so continue with next arg
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push_result_node(parser, PY_PARSE_NODE_NULL);
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backtrack = false;
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} else {
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// a mandatory rule that failed, so propagate backtrack
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if (i > 1) {
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// already eaten tokens so can't backtrack
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goto syntax_error;
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} else {
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goto next_rule;
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}
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}
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}
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// progress through the rule
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for (; i < n; ++i) {
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switch (rule->arg[i] & RULE_ARG_KIND_MASK) {
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case RULE_ARG_TOK:
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// need to match a token
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tok_kind = rule->arg[i] & RULE_ARG_ARG_MASK;
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if (py_lexer_is_kind(lex, tok_kind)) {
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// matched token
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if (tok_kind == PY_TOKEN_NAME) {
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push_result_token(parser, lex);
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}
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py_lexer_to_next(lex);
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} else {
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// failed to match token
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if (i > 0) {
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// already eaten tokens so can't backtrack
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goto syntax_error;
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} else {
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// this rule failed, so backtrack
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backtrack = true;
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goto next_rule;
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}
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}
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break;
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case RULE_ARG_RULE:
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//if (i + 1 < n) {
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push_rule(parser, rule, i + 1);
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//}
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push_rule_from_arg(parser, rule->arg[i]);
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goto next_rule;
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case RULE_ARG_OPT_RULE:
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push_rule(parser, rule, i + 1);
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push_rule_from_arg(parser, rule->arg[i]);
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goto next_rule;
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default:
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assert(0);
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}
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}
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assert(i == n);
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// matched the rule, so now build the corresponding parse_node
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// count number of arguments for the parse_node
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i = 0;
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emit_rule = false;
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for (int x = 0; x < n; ++x) {
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if ((rule->arg[x] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
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tok_kind = rule->arg[x] & RULE_ARG_ARG_MASK;
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if (tok_kind >= PY_TOKEN_NAME) {
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emit_rule = true;
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}
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if (tok_kind == PY_TOKEN_NAME) {
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// only tokens which were names are pushed to stack
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i += 1;
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}
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} else {
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// rules are always pushed
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i += 1;
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}
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}
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// always emit these rules, even if they have only 1 argument
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if (rule->rule_id == RULE_expr_stmt || rule->rule_id == RULE_yield_stmt) {
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emit_rule = true;
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}
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// never emit these rules if they have only 1 argument
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// NOTE: can't put atom_paren here because we need it to distinguisg, for example, [a,b] from [(a,b)]
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if (rule->rule_id == RULE_else_stmt || rule->rule_id == RULE_testlist_comp_3b || rule->rule_id == RULE_import_as_names_paren || rule->rule_id == RULE_typedargslist_colon || rule->rule_id == RULE_typedargslist_equal || rule->rule_id == RULE_dictorsetmaker_colon || rule->rule_id == RULE_classdef_2 || rule->rule_id == RULE_with_item_as || rule->rule_id == RULE_assert_stmt_extra || rule->rule_id == RULE_as_name || rule->rule_id == RULE_raise_stmt_from || rule->rule_id == RULE_vfpdef) {
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emit_rule = false;
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}
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// always emit these rules, and add an extra blank node at the end (to be used by the compiler to store data)
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if (rule->rule_id == RULE_funcdef || rule->rule_id == RULE_classdef || rule->rule_id == RULE_comp_for || rule->rule_id == RULE_lambdef || rule->rule_id == RULE_lambdef_nocond) {
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emit_rule = true;
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push_result_node(parser, PY_PARSE_NODE_NULL);
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i += 1;
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}
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int num_not_nil = 0;
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for (int x = 0; x < i; ++x) {
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if (peek_result(parser, x) != PY_PARSE_NODE_NULL) {
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num_not_nil += 1;
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}
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}
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//printf("done and %s n=%d i=%d notnil=%d\n", rule->rule_name, n, i, num_not_nil);
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if (emit_rule) {
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push_result_rule(parser, rule, i);
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} else if (num_not_nil == 0) {
|
|
push_result_rule(parser, rule, i); // needed for, eg, atom_paren, testlist_comp_3b
|
|
//result_stack_show(parser);
|
|
//assert(0);
|
|
} else if (num_not_nil == 1) {
|
|
// single result, leave it on stack
|
|
py_parse_node_t pn = PY_PARSE_NODE_NULL;
|
|
for (int x = 0; x < i; ++x) {
|
|
py_parse_node_t pn2 = pop_result(parser);
|
|
if (pn2 != PY_PARSE_NODE_NULL) {
|
|
pn = pn2;
|
|
}
|
|
}
|
|
push_result_node(parser, pn);
|
|
} else {
|
|
push_result_rule(parser, rule, i);
|
|
}
|
|
break;
|
|
|
|
case RULE_ACT_LIST:
|
|
// n=2 is: item item*
|
|
// n=1 is: item (sep item)*
|
|
// n=3 is: item (sep item)* [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 (;;) {
|
|
uint arg = rule->arg[i & 1 & n];
|
|
switch (arg & RULE_ARG_KIND_MASK) {
|
|
case RULE_ARG_TOK:
|
|
if (py_lexer_is_kind(lex, arg & RULE_ARG_ARG_MASK)) {
|
|
if (i & 1 & n) {
|
|
// separators which are tokens are not pushed to result stack
|
|
} else {
|
|
push_result_token(parser, lex);
|
|
}
|
|
py_lexer_to_next(lex);
|
|
// 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:
|
|
push_rule(parser, rule, i + 1);
|
|
push_rule_from_arg(parser, arg);
|
|
goto next_rule;
|
|
default:
|
|
assert(0);
|
|
}
|
|
}
|
|
}
|
|
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
|
|
push_result_rule(parser, rule, i);
|
|
} else {
|
|
// just leave single item on stack (ie don't wrap in a list)
|
|
}
|
|
} else {
|
|
//printf("done list %s %d %d\n", rule->rule_name, n, i);
|
|
push_result_rule(parser, rule, i);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
assert(0);
|
|
}
|
|
}
|
|
if (!py_lexer_is_kind(lex, PY_TOKEN_END)) {
|
|
py_lexer_show_error(lex, "unexpected token at end:");
|
|
py_token_show(py_lexer_cur(lex));
|
|
}
|
|
//printf("--------------\n");
|
|
//result_stack_show(parser);
|
|
assert(parser->result_stack_top == 1);
|
|
//printf("maximum depth: %d\n", parser->rule_stack_alloc);
|
|
//printf("number of parse nodes allocated: %d\n", num_parse_nodes_allocated);
|
|
return parser->result_stack[0];
|
|
|
|
syntax_error:
|
|
py_lexer_show_error(lex, "syntax error:");
|
|
#ifdef USE_RULE_NAME
|
|
py_lexer_show_error(lex, rule->rule_name);
|
|
#endif
|
|
py_token_show(py_lexer_cur(lex));
|
|
return PY_PARSE_NODE_NULL;
|
|
}
|