++ num_fixups;
}
-/* The following three functions allow a backup of the fixup chain to be made,
- and to have this backup be swapped with the current chain. This allows
- certain ports, eg the m32r, to swap two instructions and swap their fixups
- at the same time. */
-/* ??? I think with cgen_asm_finish_insn (or something else) there is no
- more need for this. */
+/* The following functions allow fixup chains to be stored, retrieved,
+ and swapped. They are a generalization of a pre-existing scheme
+ for storing, restoring and swapping fixup chains that was used by
+ the m32r port. The functionality is essentially the same, only
+ instead of only being able to store a single fixup chain, an entire
+ array of fixup chains can be stored. It is the user's responsibility
+ to keep track of how many fixup chains have been stored and which
+ elements of the array they are in.
+
+ The algorithms used are the same as in the old scheme. Other than the
+ "array-ness" of the whole thing, the functionality is identical to the
+ old scheme.
+
+ gas_cgen_initialize_saved_fixups_array():
+ Sets num_fixups_in_chain to 0 for each element. Call this from
+ md_begin() if you plan to use these functions and you want the
+ fixup count in each element to be set to 0 intially. This is
+ not necessary, but it's included just in case. It performs
+ the same function for each element in the array of fixup chains
+ that gas_init_parse() performs for the current fixups.
+
+ gas_cgen_save_fixups (element):
+ element - element number of the array you wish to store the fixups
+ to. No mechanism is built in for tracking what element
+ was last stored to.
+
+ gas_cgen_restore_fixups (element):
+ element - element number of the array you wish to restore the fixups
+ from.
+
+ gas_cgen_swap_fixups(int element):
+ element - swap the current fixups with those in this element number.
+*/
+
+struct saved_fixups {
+ struct fixup fixup_chain[GAS_CGEN_MAX_FIXUPS];
+ int num_fixups_in_chain;
+};
-static struct fixup saved_fixups[GAS_CGEN_MAX_FIXUPS];
-static int saved_num_fixups;
+static struct saved_fixups stored_fixups[MAX_SAVED_FIXUP_CHAINS];
-void
-gas_cgen_save_fixups ()
+void
+gas_cgen_initialize_saved_fixups_array ()
{
- saved_num_fixups = num_fixups;
-
- memcpy (saved_fixups, fixups, sizeof (fixups[0]) * num_fixups);
-
- num_fixups = 0;
+ int i = 0;
+ while (i < MAX_SAVED_FIXUP_CHAINS)
+ stored_fixups[i++].num_fixups_in_chain = 0;
}
-void
-gas_cgen_restore_fixups ()
+void
+gas_cgen_save_fixups (int i)
{
- num_fixups = saved_num_fixups;
-
- memcpy (fixups, saved_fixups, sizeof (fixups[0]) * num_fixups);
-
- saved_num_fixups = 0;
+ if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
+ {
+ as_fatal("Index into stored_fixups[] out of bounds.");
+ return;
+ }
+ stored_fixups[i].num_fixups_in_chain = num_fixups;
+ memcpy(stored_fixups[i].fixup_chain, fixups,
+ sizeof (fixups[0])*num_fixups);
+ num_fixups = 0;
}
-void
-gas_cgen_swap_fixups ()
+void
+gas_cgen_restore_fixups (int i)
{
- int tmp;
- struct fixup tmp_fixup;
-
- if (num_fixups == 0)
- {
- gas_cgen_restore_fixups ();
- }
- else if (saved_num_fixups == 0)
- {
- gas_cgen_save_fixups ();
- }
- else
- {
- tmp = saved_num_fixups;
- saved_num_fixups = num_fixups;
- num_fixups = tmp;
+ if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
+ {
+ as_fatal("Index into stored_fixups[] out of bounds.");
+ return;
+ }
+ num_fixups = stored_fixups[i].num_fixups_in_chain;
+ memcpy(fixups,stored_fixups[i].fixup_chain,
+ (sizeof (stored_fixups[i].fixup_chain[0]))*num_fixups);
+ stored_fixups[i].num_fixups_in_chain = 0;
+}
- for (tmp = GAS_CGEN_MAX_FIXUPS; tmp--;)
- {
- tmp_fixup = saved_fixups [tmp];
- saved_fixups [tmp] = fixups [tmp];
- fixups [tmp] = tmp_fixup;
- }
+void
+gas_cgen_swap_fixups (int i)
+{
+ int tmp;
+ struct fixup tmp_fixup;
+
+ if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
+ {
+ as_fatal("Index into stored_fixups[] out of bounds.");
+ return;
+ }
+
+ if (num_fixups == 0)
+ {
+ gas_cgen_restore_fixups (i);
+ }
+ else if (stored_fixups[i].num_fixups_in_chain == 0)
+ {
+ gas_cgen_save_fixups (i);
+ }
+ else
+ {
+ tmp = stored_fixups[i].num_fixups_in_chain;
+ stored_fixups[i].num_fixups_in_chain = num_fixups;
+ num_fixups = tmp;
+
+ for (tmp = GAS_CGEN_MAX_FIXUPS; tmp--;)
+ {
+ tmp_fixup = stored_fixups[i].fixup_chain [tmp];
+ stored_fixups[i].fixup_chain[tmp] = fixups [tmp];
+ fixups [tmp] = tmp_fixup;
+ }
}
}
scom_symbol.section = &scom_section;
allow_m32rx (enable_m32rx);
+
+ gas_cgen_initialize_saved_fixups_array();
}
#define OPERAND_IS_COND_BIT(operand, indices, index) \
/* Preserve any fixups that have been generated and reset the list
to empty. */
- gas_cgen_save_fixups ();
+ gas_cgen_save_fixups (0);
/* Get the indices of the operands of the instruction. */
/* FIXME: CGEN_FIELDS is already recorded, but relying on that fact
|| (errmsg = (char *) can_make_parallel (&first, &second)) == NULL)
{
/* Get the fixups for the first instruction. */
- gas_cgen_swap_fixups ();
+ gas_cgen_swap_fixups (0);
/* Write it out. */
expand_debug_syms (first.debug_sym_link, 1);
make_parallel (second.buffer);
/* Get its fixups. */
- gas_cgen_restore_fixups ();
+ gas_cgen_restore_fixups (0);
/* Write it out. */
expand_debug_syms (second.debug_sym_link, 1);
make_parallel (first.buffer);
/* Get the fixups for the first instruction. */
- gas_cgen_restore_fixups ();
+ gas_cgen_restore_fixups (0);
/* Write out the first instruction. */
expand_debug_syms (first.debug_sym_link, 1);
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