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Alias keyword (#868)

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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
6 changed files with 193 additions and 21 deletions
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11
src/libavrdude.h
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@@ -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);