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Alias keyword (#868) 

Implementation for an "alias" keyword.

By now, only applied inside memory descriptions.

* Make "mem_alias" a separate nonterminal.

The previous implementation attempt caused a syntax error in
yacc code, and separating mem_alias on the same level as
mem_spec appears to be the cleaner solution anyway.

* Maintain real memory aliases.

Instead of duplicating the aliased memory with a new name, maintain a
second list of memory aliases (per device) that contains a pointer to
the memory area it is aliased to. That way, a memory name can be
clearly distinguished between the canonical one and any aliases.

* Check p->mem_alias != NULL before touching it

* Add avr_find_memalias()

This takes a memory region as input, and searches whether an
alias can be found for it.

* We need to add a list structure for the mem_alias list, always.

By that means, mem_alias won't ever be NULL, so no need to check
later.

Also, in avr_dup_part(), duplicate the alias list.

* In a memory alias, actually remember the current name.

* In avr_dup_part(), adjust pointers of aliased memories

While walking the list of memories, for each entry, see if there is an
alias pointing to it. If so, allocate a duplicated one, and fix its
aliased_mem pointer to point to the duplicated memory region instead
of the original one.

* Add avr_locate_mem_noalias()

When looking whether any memory region has already been defined for
the current part while parsing the config file, only non-aliased names
must be considered. Otherwise, a newly defined alias would kick out
the memory definition it is being aliased to.

* When defining a mem_alias, drop any existing one of that name.

* Actually use avr_find_memalias() to find aliases

* Add declaration for avr_find_memalias()

* When defining a memory, also search for an existing alias

If the newly defined name has the same as an existing alias, the alias
can be removed.

Note that we do explicitly *not* remove any memory by the same name of
a later defined alias, as this might invalidate another alias'es
pointer. If someone defines that, the alias name just won't ever be
found by avr_locate_mem().
This commit is contained in:
Jörg Wunsch 2022-02-10 20:39:19 +01:00 committed by GitHub
parent ba314f23e9
commit d134dc8fff
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 193 additions and 21 deletions
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144
src/avrpart.c
View File

@ -260,6 +260,21 @@ AVRMEM * avr_new_memtype(void)
return m;
}
AVRMEM_ALIAS * avr_new_memalias(void)
{
AVRMEM_ALIAS * m;
m = (AVRMEM_ALIAS *)malloc(sizeof(*m));
if (m == NULL) {
avrdude_message(MSG_INFO, "avr_new_memalias(): out of memory\n");
exit(1);
}
memset(m, 0, sizeof(*m));
return m;
}
/*
* Allocate and initialize memory buffers for each of the device's
@ -326,6 +341,17 @@ AVRMEM * avr_dup_mem(AVRMEM * m)
return n;
}
AVRMEM_ALIAS * avr_dup_memalias(AVRMEM_ALIAS * m)
{
AVRMEM_ALIAS * n;
n = avr_new_memalias();
*n = *m;
return n;
}
void avr_free_mem(AVRMEM * m)
{
int i;
@ -348,7 +374,36 @@ void avr_free_mem(AVRMEM * m)
free(m);
}
AVRMEM * avr_locate_mem(AVRPART * p, char * desc)
void avr_free_memalias(AVRMEM_ALIAS * m)
{
free(m);
}
AVRMEM_ALIAS * avr_locate_memalias(AVRPART * p, char * desc)
{
AVRMEM_ALIAS * m, * match;
LNODEID ln;
int matches;
int l;
l = strlen(desc);
matches = 0;
match = NULL;
for (ln=lfirst(p->mem_alias); ln; ln=lnext(ln)) {
m = ldata(ln);
if (strncmp(desc, m->desc, l) == 0) {
match = m;
matches++;
}
}
if (matches == 1)
return match;
return NULL;
}
AVRMEM * avr_locate_mem_noalias(AVRPART * p, char * desc)
{
AVRMEM * m, * match;
LNODEID ln;
@ -373,11 +428,54 @@ AVRMEM * avr_locate_mem(AVRPART * p, char * desc)
}
AVRMEM * avr_locate_mem(AVRPART * p, char * desc)
{
AVRMEM * m, * match;
AVRMEM_ALIAS * alias;
LNODEID ln;
int matches;
int l;
l = strlen(desc);
matches = 0;
match = NULL;
for (ln=lfirst(p->mem); ln; ln=lnext(ln)) {
m = ldata(ln);
if (strncmp(desc, m->desc, l) == 0) {
match = m;
matches++;
}
}
if (matches == 1)
return match;
/* not yet found: look for matching alias name */
alias = avr_locate_memalias(p, desc);
if (alias != NULL)
return alias->aliased_mem;
return NULL;
}
AVRMEM_ALIAS * avr_find_memalias(AVRPART * p, AVRMEM * m_orig)
{
AVRMEM_ALIAS * m;
LNODEID ln;
for (ln=lfirst(p->mem_alias); ln; ln=lnext(ln)) {
m = ldata(ln);
if (m->aliased_mem == m_orig)
return m;
}
return NULL;
}
void avr_mem_display(const char * prefix, FILE * f, AVRMEM * m, AVRPART * p,
int type, int verbose)
{
static LNODEID ln;
static AVRMEM * n;
static unsigned int prev_mem_offset, prev_mem_size;
int i, j;
char * optr;
@ -398,25 +496,14 @@ void avr_mem_display(const char * prefix, FILE * f, AVRMEM * m, AVRPART * p,
prefix, prefix, prefix);
}
// Get the next memory section, and stop before going out of band
if (ln == NULL)
ln = lnext(lfirst(p->mem));
else
ln = lnext(ln);
if (ln != NULL)
n = ldata(ln);
// Only print memory section if the previous section printed isn't identical
if(prev_mem_offset != m->offset || prev_mem_size != m->size || (strcmp(p->family_id, "") == 0)) {
prev_mem_offset = m->offset;
prev_mem_size = m->size;
AVRMEM_ALIAS *ap = avr_find_memalias(p, m);
/* Show alias if the current and the next memory section has the same offset
and size, we're not out of band and a family_id is present */
char * mem_desc_alias = m->offset == n->offset && \
m->size == n->size && \
ln != NULL && \
strcmp(p->family_id, "") != 0 ?
n->desc : "";
char * mem_desc_alias = ap? ap->desc: "";
fprintf(f,
"%s%-11s %-8s %4d %5d %5d %4d %-6s %6d %4d %6d %5d %5d 0x%02x 0x%02x\n",
prefix,
@ -488,6 +575,7 @@ AVRPART * avr_new_part(void)
p->ocdrev = -1;
p->mem = lcreat(NULL, 0);
p->mem_alias = lcreat(NULL, 0);
return p;
}
@ -496,19 +584,35 @@ AVRPART * avr_new_part(void)
AVRPART * avr_dup_part(AVRPART * d)
{
AVRPART * p;
LISTID save;
LNODEID ln;
LISTID save, save2;
LNODEID ln, ln2;
int i;
p = avr_new_part();
save = p->mem;
save2 = p->mem_alias;
*p = *d;
p->mem = save;
p->mem_alias = save2;
for (ln=lfirst(d->mem); ln; ln=lnext(ln)) {
ladd(p->mem, avr_dup_mem(ldata(ln)));
AVRMEM *m = ldata(ln);
AVRMEM *m2 = avr_dup_mem(m);
ladd(p->mem, m2);
// see if there is any alias for it
for (ln2=lfirst(d->mem_alias); ln2; ln2=lnext(ln2)) {
AVRMEM_ALIAS *a = ldata(ln2);
if (a->aliased_mem == m) {
// yes, duplicate it
AVRMEM_ALIAS *a2 = avr_dup_memalias(a);
// ... adjust the pointer ...
a2->aliased_mem = m2;
// ... and add to new list
ladd(p->mem_alias, a2);
}
}
}
for (i = 0; i < AVR_OP_MAX; i++) {
@ -523,6 +627,8 @@ void avr_free_part(AVRPART * d)
int i;
ldestroy_cb(d->mem, (void(*)(void *))avr_free_mem);
d->mem = NULL;
ldestroy_cb(d->mem_alias, (void(*)(void *))avr_free_memalias);
d->mem_alias = NULL;
for(i=0;i<sizeof(d->op)/sizeof(d->op[0]);i++)
{
if (d->op[i] != NULL)

2
src/config.c
View File

@ -47,6 +47,7 @@ AVRPART * current_part;
AVRMEM * current_mem;
LISTID part_list;
LISTID programmers;
bool is_alias;
int lineno;
const char * infile;
@ -72,6 +73,7 @@ int init_config(void)
current_mem = NULL;
part_list = lcreat(NULL, 0);
programmers = lcreat(NULL, 0);
is_alias = false;
lineno = 1;
infile = NULL;

1
src/config.h
View File

@ -54,6 +54,7 @@ extern int lineno;
extern const char * infile;
extern LISTID string_list;
extern LISTID number_list;
extern bool is_alias; // current entry is alias
#if !defined(HAS_YYSTYPE)

55
src/config_gram.y
View File

@ -68,6 +68,7 @@ static int pin_name;
%token K_PAGE_SIZE
%token K_PAGED
%token K_ALIAS
%token K_BAUDRATE
%token K_BS2
%token K_BUFF
@ -1238,13 +1239,24 @@ part_parm :
mem_specs
{
AVRMEM * existing_mem;
AVRMEM_ALIAS * existing_alias;
existing_mem = avr_locate_mem(current_part, current_mem->desc);
existing_mem = avr_locate_mem_noalias(current_part, current_mem->desc);
if (existing_mem != NULL) {
lrmv_d(current_part->mem, existing_mem);
avr_free_mem(existing_mem);
}
ladd(current_part->mem, current_mem);
existing_alias = avr_locate_memalias(current_part, current_mem->desc);
if (existing_alias != NULL) {
lrmv_d(current_part->mem_alias, existing_alias);
avr_free_memalias(existing_alias);
}
if (is_alias) {
avr_free_mem(current_mem); // alias mem has been already entered below
is_alias = false;
} else {
ladd(current_part->mem, current_mem);
}
current_mem = NULL;
} |
@ -1281,6 +1293,7 @@ yesno :
mem_specs :
mem_spec TKN_SEMI |
mem_alias TKN_SEMI |
mem_specs mem_spec TKN_SEMI
;
@ -1410,6 +1423,44 @@ mem_spec :
}
;
mem_alias :
K_ALIAS TKN_STRING
{
AVRMEM * existing_mem;
existing_mem = avr_locate_mem(current_part, $2->value.string);
if (existing_mem == NULL) {
yyerror("%s alias to non-existent memory %s",
current_mem->desc, $2->value.string);
free_token($2);
YYABORT;
}
// if this alias does already exist, drop the old one
AVRMEM_ALIAS * alias = avr_locate_memalias(current_part, current_mem->desc);
if (alias) {
lrmv_d(current_part->mem_alias, alias);
avr_free_memalias(alias);
}
// NB: we do *not* check whether any non-alias region of the
// same name does already exist, as that one could be pointed to
// by an(other) alias as well. If we destroyed it, the alias
// pointer would get stale. In case someone defines the same
// name both as a regular memory as well as an alias, the
// regular one will always be found first by avr_locate_mem().
is_alias = true;
alias = avr_new_memalias();
// alias->desc and current_mem->desc have the same length
// definition, thus no need to check for length here
strcpy(alias->desc, current_mem->desc);
alias->aliased_mem = existing_mem;
ladd(current_part->mem_alias, alias);
free_token($2);
}
;
%%

1
src/lexer.l
View File

@ -117,6 +117,7 @@ SIGN [+-]
<strng>\n { yyerror("unterminated character constant");
return YYERRCODE; }
alias { yylval=NULL; return K_ALIAS; }
allowfullpagebitstream { yylval=NULL; return K_ALLOWFULLPAGEBITSTREAM; }
avr910_devcode { yylval=NULL; return K_AVR910_DEVCODE; }
bank_size { yylval=NULL; return K_PAGE_SIZE; }

11
src/libavrdude.h
View File

@ -261,6 +261,7 @@ typedef struct avrpart {
OPCODE * op[AVR_OP_MAX]; /* opcodes */
LISTID mem; /* avr memory definitions */
LISTID mem_alias; /* memory alias definitions */
char config_file[PATH_MAX]; /* config file where defined */
int lineno; /* config file line number */
} AVRPART;
@ -292,6 +293,11 @@ typedef struct avrmem {
OPCODE * op[AVR_OP_MAX]; /* opcodes */
} AVRMEM;
typedef struct avrmem_alias {
char desc[AVR_MEMDESCLEN]; /* alias name ("syscfg0" etc.) */
AVRMEM *aliased_mem;
} AVRMEM_ALIAS;
#ifdef __cplusplus
extern "C" {
#endif
@ -307,10 +313,15 @@ int avr_get_output_index(OPCODE * op);
/* Functions for AVRMEM structures */
AVRMEM * avr_new_memtype(void);
AVRMEM_ALIAS * avr_new_memalias(void);
int avr_initmem(AVRPART * p);
AVRMEM * avr_dup_mem(AVRMEM * m);
void avr_free_mem(AVRMEM * m);
void avr_free_memalias(AVRMEM_ALIAS * m);
AVRMEM * avr_locate_mem(AVRPART * p, char * desc);
AVRMEM * avr_locate_mem_noalias(AVRPART * p, char * desc);
AVRMEM_ALIAS * avr_locate_memalias(AVRPART * p, char * desc);
AVRMEM_ALIAS * avr_find_memalias(AVRPART * p, AVRMEM * m_orig);
void avr_mem_display(const char * prefix, FILE * f, AVRMEM * m, AVRPART * p,
int type, int verbose);