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gpgscm: Simplify hash tables.

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* tests/gpgscm/scheme.c (oblist_add_by_name): We now always get a
slot.  Simplify accordingly.
(oblist_find_by_name): Always return the slot.
(vector_elem_slot): New function.
(new_slot_spec_in_env): We now always get a slot.  Remove parameter
'env'.  Simplify accordingly.
(find_slot_spec_in_env): Always return a slot.
(new_slot_in_env): Adapt callsite.
(opexe_0): Likewise.
(opexe_1): Likewise.
(scheme_define): Likewise.
--

Now that the ill-devised immediate values framework is gone, there is
no need to tag the pointers in vectors anymore.  Therefore, we can
always return a pointer to the slot in the hash table lookup
functions.

Signed-off-by: Justus Winter <justus@g10code.com>
This commit is contained in:
Justus Winter 2017-03-16 17:18:01 +01:00
parent 38c955599f
commit 6a3f857224
No known key found for this signature in database
GPG Key ID: DD1A52F9DA8C9020
1 changed files with 22 additions and 49 deletions
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71
tests/gpgscm/scheme.c
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@ -224,6 +224,7 @@ INTERFACE INLINE int is_vector(pointer p) { return (type(p)==T_VECTOR); }
* represent it. */
#define vector_size(len) (1 + ((len) - 1 + 2) / 3)
INTERFACE static void fill_vector(pointer vec, pointer obj);
INTERFACE static pointer *vector_elem_slot(pointer vec, int ielem);
INTERFACE static pointer vector_elem(pointer vec, int ielem);
INTERFACE static pointer set_vector_elem(pointer vec, int ielem, pointer a);
INTERFACE INLINE int is_number(pointer p) { return (type(p)==T_NUMBER); }
@ -1073,39 +1074,24 @@ static pointer oblist_initial_value(scheme *sc)
/* Add a new symbol NAME at SLOT. SLOT must be obtained using
* oblist_find_by_name, and no insertion must be done between
* obtaining the SLOT and calling this function. Returns the new
* symbol.
*
* If SLOT is NULL, the new symbol is be placed at the appropriate
* place in the vector. */
* symbol. */
static pointer oblist_add_by_name(scheme *sc, const char *name, pointer *slot)
{
#define oblist_add_by_name_allocates 3
pointer x;
int location;
gc_disable(sc, gc_reservations (oblist_add_by_name));
x = immutable_cons(sc, mk_string(sc, name), sc->NIL);
typeflag(x) = T_SYMBOL;
setimmutable(car(x));
if (slot == NULL) {
location = hash_fn(name, vector_length(sc->oblist));
set_vector_elem(sc->oblist, location,
immutable_cons(sc, x, vector_elem(sc->oblist, location)));
} else {
*slot = immutable_cons(sc, x, *slot);
}
*slot = immutable_cons(sc, x, *slot);
gc_enable(sc);
return x;
}
/* Lookup the symbol NAME. Returns the symbol, or NIL if it does not
* exist. In that case, SLOT points to the point where the new symbol
* is to be inserted.
*
* SLOT may be set to NULL if the new symbol should be placed at the
* appropriate place in the vector. */
* is to be inserted. */
static INLINE pointer
oblist_find_by_name(scheme *sc, const char *name, pointer **slot)
{
@ -1115,7 +1101,7 @@ oblist_find_by_name(scheme *sc, const char *name, pointer **slot)
int d;
location = hash_fn(name, vector_length(sc->oblist));
for (*slot = NULL, x = vector_elem(sc->oblist, location);
for (*slot = vector_elem_slot(sc->oblist, location), x = **slot;
x != sc->NIL; *slot = &cdr(x), x = **slot) {
s = symname(car(x));
/* case-insensitive, per R5RS section 2. */
@ -1353,6 +1339,12 @@ INTERFACE static void fill_vector(pointer vec, pointer obj) {
}
}
INTERFACE static pointer *vector_elem_slot(pointer vec, int ielem) {
assert (is_vector (vec));
assert (ielem < vector_length(vec));
return &vec->_object._vector._elements[ielem];
}
INTERFACE static pointer vector_elem(pointer vec, int ielem) {
assert (is_vector (vec));
assert (ielem < vector_length(vec));
@ -2636,11 +2628,8 @@ static void new_frame_in_env(scheme *sc, pointer old_env)
/* Insert (VARIABLE, VALUE) at SSLOT. SSLOT must be obtained using
* find_slot_spec_in_env, and no insertion must be done between
* obtaining SSLOT and the call to this function.
*
* If SSLOT is NULL, the new slot is put into the appropriate place in
* the environment vector. */
static INLINE void new_slot_spec_in_env(scheme *sc, pointer env,
* obtaining SSLOT and the call to this function. */
static INLINE void new_slot_spec_in_env(scheme *sc,
pointer variable, pointer value,
pointer *sslot)
{
@ -2648,27 +2637,14 @@ static INLINE void new_slot_spec_in_env(scheme *sc, pointer env,
pointer slot;
gc_disable(sc, gc_reservations (new_slot_spec_in_env));
slot = immutable_cons(sc, variable, value);
if (sslot == NULL) {
int location;
assert(is_vector(car(env)));
location = hash_fn(symname(variable), vector_length(car(env)));
set_vector_elem(car(env), location,
immutable_cons(sc, slot, vector_elem(car(env), location)));
} else {
*sslot = immutable_cons(sc, slot, *sslot);
}
*sslot = immutable_cons(sc, slot, *sslot);
gc_enable(sc);
}
/* Find the slot in ENV under the key HDL. If ALL is given, look in
* all environments enclosing ENV. If the lookup fails, and SSLOT is
* given, the position where the new slot has to be inserted is stored
* at SSLOT.
*
* SSLOT may be set to NULL if the new symbol should be placed at the
* appropriate place in the vector. */
* at SSLOT. */
static pointer
find_slot_spec_in_env(scheme *sc, pointer env, pointer hdl, int all, pointer **sslot)
{
@ -2681,13 +2657,11 @@ find_slot_spec_in_env(scheme *sc, pointer env, pointer hdl, int all, pointer **s
for (x = env; x != sc->NIL; x = cdr(x)) {
if (is_vector(car(x))) {
location = hash_fn(symname(hdl), vector_length(car(x)));
sl = NULL;
y = vector_elem(car(x), location);
sl = vector_elem_slot(car(x), location);
} else {
sl = &car(x);
y = *sl;
}
for ( ; y != sc->NIL; sl = &cdr(y), y = *sl) {
for (y = *sl ; y != sc->NIL; sl = &cdr(y), y = *sl) {
d = pointercmp(caar(y), hdl);
if (d == 0)
return car(y); /* Hit. */
@ -2716,12 +2690,11 @@ static INLINE void new_frame_in_env(scheme *sc, pointer old_env)
/* Insert (VARIABLE, VALUE) at SSLOT. SSLOT must be obtained using
* find_slot_spec_in_env, and no insertion must be done between
* obtaining SSLOT and the call to this function. */
static INLINE void new_slot_spec_in_env(scheme *sc, pointer env,
static INLINE void new_slot_spec_in_env(scheme *sc,
pointer variable, pointer value,
pointer *sslot)
{
#define new_slot_spec_in_env_allocates 2
(void) env;
assert(is_symbol(variable));
*sslot = immutable_cons(sc, immutable_cons(sc, variable, value), *sslot);
}
@ -2772,7 +2745,7 @@ static INLINE void new_slot_in_env(scheme *sc, pointer variable, pointer value)
assert(is_symbol(variable));
slot = find_slot_spec_in_env(sc, sc->envir, variable, 0, &sslot);
assert(slot == sc->NIL);
new_slot_spec_in_env(sc, sc->envir, variable, value, sslot);
new_slot_spec_in_env(sc, variable, value, sslot);
}
static INLINE void set_slot_in_env(scheme *sc, pointer slot, pointer value)
@ -3534,7 +3507,7 @@ static pointer opexe_0(scheme *sc, enum scheme_opcodes op) {
if (x != sc->NIL) {
set_slot_in_env(sc, x, sc->value);
} else {
new_slot_spec_in_env(sc, sc->envir, sc->code, sc->value, sslot);
new_slot_spec_in_env(sc, sc->code, sc->value, sslot);
}
s_return(sc,sc->code);
}
@ -3856,7 +3829,7 @@ static pointer opexe_1(scheme *sc, enum scheme_opcodes op) {
if (x != sc->NIL) {
set_slot_in_env(sc, x, sc->value);
} else {
new_slot_spec_in_env(sc, sc->envir, sc->code, sc->value, sslot);
new_slot_spec_in_env(sc, sc->code, sc->value, sslot);
}
s_return(sc,sc->code);
}
@ -5811,7 +5784,7 @@ void scheme_define(scheme *sc, pointer envir, pointer symbol, pointer value) {
if (x != sc->NIL) {
set_slot_in_env(sc, x, value);
} else {
new_slot_spec_in_env(sc, envir, symbol, value, sslot);
new_slot_spec_in_env(sc, symbol, value, sslot);
}
}