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/*
* fmd_parser.y, parser generator for flashmap descriptor language
*
* Copyright (C) 2015 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
%{
#include "fmd_scanner.h"
#include "common.h"
#include <stdlib.h>
struct flashmap_descriptor *res = NULL;
%}
%union {
unsigned intval;
char *strval;
struct unsigned_option maybe_intval;
struct flashmap_descriptor *region_ptr;
union flashmap_flags flags;
struct descriptor_list region_listhdr;
}
%code requires {
#include "fmd.h"
#include "option.h"
#include <stdbool.h>
struct descriptor_node {
struct flashmap_descriptor *val;
struct descriptor_node *next;
};
struct descriptor_list {
size_t len;
struct descriptor_node *head;
struct descriptor_node *tail;
};
extern struct flashmap_descriptor *res;
struct flashmap_descriptor *parse_descriptor(
char *name, union flashmap_flags flags, struct unsigned_option offset,
struct unsigned_option size, struct descriptor_list children);
void yyerror(const char *s);
}
%token <intval> INTEGER
%token OCTAL
%token <strval> STRING
%token FLAG_CBFS
%token FLAG_PRESERVE
%type <region_ptr> flash_region
%type <strval> region_name
%type <flags> region_flags_opt
%type <flags> region_flags
%type <flags> region_flag
%type <maybe_intval> region_offset_opt
%type <maybe_intval> region_offset
%type <maybe_intval> region_size_opt
%type <maybe_intval> region_size
%type <region_listhdr> region_list_opt
%type <region_listhdr> region_list
%type <region_listhdr> region_list_entries
%%
flash_chip: region_name region_offset_opt region_size region_list
{
union flashmap_flags flags = { .v=0 };
if (!(res = parse_descriptor($1, flags, $2, $3, $4)))
YYABORT;
};
flash_region: region_name region_flags_opt region_offset_opt region_size_opt
region_list_opt
{
struct flashmap_descriptor *node = parse_descriptor($1, $2, $3, $4, $5);
if (!node)
YYABORT;
if (node->flags.f.cbfs && !fmd_process_flag_cbfs(node)) {
ERROR("Section '%s' cannot have flag 'CBFS''\n", node->name);
YYABORT;
}
$$ = node;
};
region_name: STRING
{
if (!$1) {
perror("E: While allocating section name");
YYABORT;
}
};
region_flags_opt: { $$ = (union flashmap_flags){ .v=0 }; }
| '(' region_flags ')' { $$ = $2; };
region_flags: region_flag | region_flag region_flags { $$.v = $1.v | $2.v; };
region_flag: FLAG_CBFS { $$.v = 0; $$.f.cbfs = 1; };
region_flag: FLAG_PRESERVE { $$.v = 0; $$.f.preserve = 1; };
region_offset_opt: { $$ = (struct unsigned_option){false, 0}; }
| region_offset;
region_offset: '@' INTEGER { $$ = (struct unsigned_option){true, $2}; };
region_size_opt: { $$ = (struct unsigned_option){false, 0}; }
| region_size;
region_size: INTEGER { $$ = (struct unsigned_option){true, $1}; };
region_list_opt:
{
$$ = (struct descriptor_list)
{.len = 0, .head = NULL, .tail = NULL};
}
| region_list;
region_list: '{' region_list_entries '}' { $$ = $2; };
region_list_entries: flash_region
{
struct descriptor_node *node = malloc(sizeof(*node));
if (!node) {
perror("E: While allocating linked list node");
YYABORT;
}
node->val = $1;
node->next = NULL;
$$ = (struct descriptor_list){.len = 1, .head = node, .tail = node};
}
| region_list_entries flash_region
{
struct descriptor_node *node = malloc(sizeof(*node));
if (!node) {
perror("E: While allocating linked list node");
YYABORT;
}
node->val = $2;
node->next = NULL;
$1.tail->next = node;
$$ = (struct descriptor_list)
{.len = $1.len + 1, .head = $1.head, .tail = node};
};
%%
struct flashmap_descriptor *parse_descriptor(
char *name, union flashmap_flags flags, struct unsigned_option offset,
struct unsigned_option size, struct descriptor_list children)
{
struct flashmap_descriptor *region = malloc(sizeof(*region));
if (!region) {
perror("E: While allocating descriptor section");
return NULL;
}
region->name = name;
region->flags = flags;
region->offset_known = offset.val_known;
region->offset = offset.val;
region->size_known = size.val_known;
region->size = size.val;
region->list_len = children.len;
if (region->list_len) {
region->list = malloc(region->list_len * sizeof(*region->list));
if (!region->list) {
perror("E: While allocating node children array");
return NULL;
}
struct descriptor_node *cur_node = children.head;
for (unsigned idx = 0; idx < region->list_len; ++idx) {
region->list[idx] = cur_node->val;
struct descriptor_node *next_node = cur_node->next;
free(cur_node);
cur_node = next_node;
}
} else {
region->list = NULL;
}
return region;
}
void yyerror(const char *s)
{
fprintf(stderr, "%s\n", s);
}
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