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platform_external_dtc/dtc-parser.y
Stephen Warren 45013d8619 dtc: Add ability to delete nodes and properties 
dtc currently allows the contents of properties to be changed, and the
contents of nodes to be added to. There are situations where removing
properties or nodes may be useful. This change implements the following
syntax to do that:

    / {
        /delete-property/ propname;
        /delete-node/ nodename;
    };

or:

    /delete-node/ &noderef;

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
2012-09-06 07:51:43 -05:00

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/*
* (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005.
*
*
* 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; either version 2 of the
* License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
%{
#include <stdio.h>
#include "dtc.h"
#include "srcpos.h"
YYLTYPE yylloc;
extern int yylex(void);
extern void print_error(char const *fmt, ...);
extern void yyerror(char const *s);
extern struct boot_info *the_boot_info;
extern int treesource_error;
static unsigned long long eval_literal(const char *s, int base, int bits);
static unsigned char eval_char_literal(const char *s);
%}
%union {
char *propnodename;
char *literal;
char *labelref;
unsigned int cbase;
uint8_t byte;
struct data data;
struct {
struct data data;
int bits;
} array;
struct property *prop;
struct property *proplist;
struct node *node;
struct node *nodelist;
struct reserve_info *re;
uint64_t integer;
}
%token DT_V1
%token DT_MEMRESERVE
%token DT_LSHIFT DT_RSHIFT DT_LE DT_GE DT_EQ DT_NE DT_AND DT_OR
%token DT_BITS
%token DT_DEL_PROP
%token DT_DEL_NODE
%token <propnodename> DT_PROPNODENAME
%token <literal> DT_LITERAL
%token <literal> DT_CHAR_LITERAL
%token <cbase> DT_BASE
%token <byte> DT_BYTE
%token <data> DT_STRING
%token <labelref> DT_LABEL
%token <labelref> DT_REF
%token DT_INCBIN
%type <data> propdata
%type <data> propdataprefix
%type <re> memreserve
%type <re> memreserves
%type <array> arrayprefix
%type <data> bytestring
%type <prop> propdef
%type <proplist> proplist
%type <node> devicetree
%type <node> nodedef
%type <node> subnode
%type <nodelist> subnodes
%type <integer> integer_prim
%type <integer> integer_unary
%type <integer> integer_mul
%type <integer> integer_add
%type <integer> integer_shift
%type <integer> integer_rela
%type <integer> integer_eq
%type <integer> integer_bitand
%type <integer> integer_bitxor
%type <integer> integer_bitor
%type <integer> integer_and
%type <integer> integer_or
%type <integer> integer_trinary
%type <integer> integer_expr
%%
sourcefile:
DT_V1 ';' memreserves devicetree
{
the_boot_info = build_boot_info($3, $4,
guess_boot_cpuid($4));
}
;
memreserves:
/* empty */
{
$$ = NULL;
}
| memreserve memreserves
{
$$ = chain_reserve_entry($1, $2);
}
;
memreserve:
DT_MEMRESERVE integer_prim integer_prim ';'
{
$$ = build_reserve_entry($2, $3);
}
| DT_LABEL memreserve
{
add_label(&$2->labels, $1);
$$ = $2;
}
;
devicetree:
'/' nodedef
{
$$ = name_node($2, "");
}
| devicetree '/' nodedef
{
$$ = merge_nodes($1, $3);
}
| devicetree DT_REF nodedef
{
struct node *target = get_node_by_ref($1, $2);
if (target)
merge_nodes(target, $3);
else
print_error("label or path, '%s', not found", $2);
$$ = $1;
}
| devicetree DT_DEL_NODE DT_REF ';'
{
struct node *target = get_node_by_ref($1, $3);
if (!target)
print_error("label or path, '%s', not found", $3);
else
delete_node(target);
$$ = $1;
}
;
nodedef:
'{' proplist subnodes '}' ';'
{
$$ = build_node($2, $3);
}
;
proplist:
/* empty */
{
$$ = NULL;
}
| proplist propdef
{
$$ = chain_property($2, $1);
}
;
propdef:
DT_PROPNODENAME '=' propdata ';'
{
$$ = build_property($1, $3);
}
| DT_PROPNODENAME ';'
{
$$ = build_property($1, empty_data);
}
| DT_DEL_PROP DT_PROPNODENAME ';'
{
$$ = build_property_delete($2);
}
| DT_LABEL propdef
{
add_label(&$2->labels, $1);
$$ = $2;
}
;
propdata:
propdataprefix DT_STRING
{
$$ = data_merge($1, $2);
}
| propdataprefix arrayprefix '>'
{
$$ = data_merge($1, $2.data);
}
| propdataprefix '[' bytestring ']'
{
$$ = data_merge($1, $3);
}
| propdataprefix DT_REF
{
$$ = data_add_marker($1, REF_PATH, $2);
}
| propdataprefix DT_INCBIN '(' DT_STRING ',' integer_prim ',' integer_prim ')'
{
FILE *f = srcfile_relative_open($4.val, NULL);
struct data d;
if ($6 != 0)
if (fseek(f, $6, SEEK_SET) != 0)
print_error("Couldn't seek to offset %llu in \"%s\": %s",
(unsigned long long)$6,
$4.val,
strerror(errno));
d = data_copy_file(f, $8);
$$ = data_merge($1, d);
fclose(f);
}
| propdataprefix DT_INCBIN '(' DT_STRING ')'
{
FILE *f = srcfile_relative_open($4.val, NULL);
struct data d = empty_data;
d = data_copy_file(f, -1);
$$ = data_merge($1, d);
fclose(f);
}
| propdata DT_LABEL
{
$$ = data_add_marker($1, LABEL, $2);
}
;
propdataprefix:
/* empty */
{
$$ = empty_data;
}
| propdata ','
{
$$ = $1;
}
| propdataprefix DT_LABEL
{
$$ = data_add_marker($1, LABEL, $2);
}
;
arrayprefix:
DT_BITS DT_LITERAL '<'
{
$$.data = empty_data;
$$.bits = eval_literal($2, 0, 7);
if (($$.bits != 8) &&
($$.bits != 16) &&
($$.bits != 32) &&
($$.bits != 64))
{
print_error("Only 8, 16, 32 and 64-bit elements"
" are currently supported");
$$.bits = 32;
}
}
| '<'
{
$$.data = empty_data;
$$.bits = 32;
}
| arrayprefix integer_prim
{
if ($1.bits < 64) {
uint64_t mask = (1ULL << $1.bits) - 1;
/*
* Bits above mask must either be all zero
* (positive within range of mask) or all one
* (negative and sign-extended). The second
* condition is true if when we set all bits
* within the mask to one (i.e. | in the
* mask), all bits are one.
*/
if (($2 > mask) && (($2 | mask) != -1ULL))
print_error(
"integer value out of range "
"%016lx (%d bits)", $1.bits);
}
$$.data = data_append_integer($1.data, $2, $1.bits);
}
| arrayprefix DT_REF
{
uint64_t val = ~0ULL >> (64 - $1.bits);
if ($1.bits == 32)
$1.data = data_add_marker($1.data,
REF_PHANDLE,
$2);
else
print_error("References are only allowed in "
"arrays with 32-bit elements.");
$$.data = data_append_integer($1.data, val, $1.bits);
}
| arrayprefix DT_LABEL
{
$$.data = data_add_marker($1.data, LABEL, $2);
}
;
integer_prim:
DT_LITERAL
{
$$ = eval_literal($1, 0, 64);
}
| DT_CHAR_LITERAL
{
$$ = eval_char_literal($1);
}
| '(' integer_expr ')'
{
$$ = $2;
}
;
integer_expr:
integer_trinary
;
integer_trinary:
integer_or
| integer_or '?' integer_expr ':' integer_trinary { $$ = $1 ? $3 : $5; }
;
integer_or:
integer_and
| integer_or DT_OR integer_and { $$ = $1 || $3; }
;
integer_and:
integer_bitor
| integer_and DT_AND integer_bitor { $$ = $1 && $3; }
;
integer_bitor:
integer_bitxor
| integer_bitor '|' integer_bitxor { $$ = $1 | $3; }
;
integer_bitxor:
integer_bitand
| integer_bitxor '^' integer_bitand { $$ = $1 ^ $3; }
;
integer_bitand:
integer_eq
| integer_bitand '&' integer_eq { $$ = $1 & $3; }
;
integer_eq:
integer_rela
| integer_eq DT_EQ integer_rela { $$ = $1 == $3; }
| integer_eq DT_NE integer_rela { $$ = $1 != $3; }
;
integer_rela:
integer_shift
| integer_rela '<' integer_shift { $$ = $1 < $3; }
| integer_rela '>' integer_shift { $$ = $1 > $3; }
| integer_rela DT_LE integer_shift { $$ = $1 <= $3; }
| integer_rela DT_GE integer_shift { $$ = $1 >= $3; }
;
integer_shift:
integer_shift DT_LSHIFT integer_add { $$ = $1 << $3; }
| integer_shift DT_RSHIFT integer_add { $$ = $1 >> $3; }
| integer_add
;
integer_add:
integer_add '+' integer_mul { $$ = $1 + $3; }
| integer_add '-' integer_mul { $$ = $1 - $3; }
| integer_mul
;
integer_mul:
integer_mul '*' integer_unary { $$ = $1 * $3; }
| integer_mul '/' integer_unary { $$ = $1 / $3; }
| integer_mul '%' integer_unary { $$ = $1 % $3; }
| integer_unary
;
integer_unary:
integer_prim
| '-' integer_unary { $$ = -$2; }
| '~' integer_unary { $$ = ~$2; }
| '!' integer_unary { $$ = !$2; }
;
bytestring:
/* empty */
{
$$ = empty_data;
}
| bytestring DT_BYTE
{
$$ = data_append_byte($1, $2);
}
| bytestring DT_LABEL
{
$$ = data_add_marker($1, LABEL, $2);
}
;
subnodes:
/* empty */
{
$$ = NULL;
}
| subnode subnodes
{
$$ = chain_node($1, $2);
}
| subnode propdef
{
print_error("syntax error: properties must precede subnodes");
YYERROR;
}
;
subnode:
DT_PROPNODENAME nodedef
{
$$ = name_node($2, $1);
}
| DT_DEL_NODE DT_PROPNODENAME ';'
{
$$ = name_node(build_node_delete(), $2);
}
| DT_LABEL subnode
{
add_label(&$2->labels, $1);
$$ = $2;
}
;
%%
void print_error(char const *fmt, ...)
{
va_list va;
va_start(va, fmt);
srcpos_verror(&yylloc, fmt, va);
va_end(va);
treesource_error = 1;
}
void yyerror(char const *s) {
print_error("%s", s);
}
static unsigned long long eval_literal(const char *s, int base, int bits)
{
unsigned long long val;
char *e;
errno = 0;
val = strtoull(s, &e, base);
if (*e) {
size_t uls = strspn(e, "UL");
if (e[uls])
print_error("bad characters in literal");
}
if ((errno == ERANGE)
|| ((bits < 64) && (val >= (1ULL << bits))))
print_error("literal out of range");
else if (errno != 0)
print_error("bad literal");
return val;
}
static unsigned char eval_char_literal(const char *s)
{
int i = 1;
char c = s[0];
if (c == '\0')
{
print_error("empty character literal");
return 0;
}
/*
* If the first character in the character literal is a \ then process
* the remaining characters as an escape encoding. If the first
* character is neither an escape or a terminator it should be the only
* character in the literal and will be returned.
*/
if (c == '\\')
c = get_escape_char(s, &i);
if (s[i] != '\0')
print_error("malformed character literal");
return c;
}
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