aboutsummaryrefslogtreecommitdiff
path: root/gas/cgen.c
diff options
context:
space:
mode:
authorJohn Healy <jhealy@redhat.com>2001-07-06 19:09:23 +0000
committerJohn Healy <jhealy@redhat.com>2001-07-06 19:09:23 +0000
commit002de68b31ef4c555e876fa30d1d154bc60d8e45 (patch)
treeb24a69f301bd41372d7959a1020c61b8c095a4c9 /gas/cgen.c
parentb1aeb4c5a3e17984e4333b45608293ba06ee8085 (diff)
downloadgdb-002de68b31ef4c555e876fa30d1d154bc60d8e45.zip
gdb-002de68b31ef4c555e876fa30d1d154bc60d8e45.tar.gz
gdb-002de68b31ef4c555e876fa30d1d154bc60d8e45.tar.bz2
2001-07-06 John Healy <jhealy@redhat.com>
* cgen.c (gas_cgen_save_fixups): Modified to allow more than one set of fixups to be stored. (gas_cgen_restore_fixups): Modified to allow the fixup chain to be restored to be chosen from any that are saved. (gas_cgen_swap_fixups): Modified to allow the current set of fixups to be swapped with any other set that has been saved. (gas_cgen_initialize_saved_fixups_array): New routine. * cgen.h: Modifed prototypes for gas_cgen_save_fixups, gas_cgen_restore_fixups, and gas_cgen_swap_fixups. Added definitions or MAX_SAVED_FIXUP_CHAINS. * config/tc-m32r.c (assemble_two_insns): Changed calls to fixup store, swap and restore fuctions to reflect the new interface.
Diffstat (limited to 'gas/cgen.c')
-rw-r--r--gas/cgen.c145
1 files changed, 99 insertions, 46 deletions
diff --git a/gas/cgen.c b/gas/cgen.c
index 759b382..7c4d12f 100644
--- a/gas/cgen.c
+++ b/gas/cgen.c
@@ -94,62 +94,115 @@ queue_fixup (opindex, opinfo, expP)
++ 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;
+ }
}
}