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except.c (insn_eh_region, [...]): New static variables. 

* except.c (insn_eh_region, maximum_uid): New static variables.
	(set_insn_eh_region): New static function to set region numbers.
	(free_insn_eh_region): New function to free EH region table.
	(init_insn_eh_region): New function to initialize EH region table.
	(in_same_eh_region): New function used to determine if two rtl
	instructions are in the same exception region or not.

From-SVN: r18624
This commit is contained in:
Andrew Macleod 1998-03-16 12:51:39 +00:00
parent 5aa550437e
commit 77d33a842d
1 changed files with 106 additions and 0 deletions
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106
gcc/except.c
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@ -2168,3 +2168,109 @@ expand_builtin_set_eh_regs (handler, offset)
emit_insn (gen_rtx_USE (VOIDmode, reg1));
emit_insn (gen_rtx_USE (VOIDmode, reg2));
}
/* This contains the code required to verify whether arbitrary instructions
are in the same exception region. */
static int *insn_eh_region = (int *)0;
static int maximum_uid;
static void set_insn_eh_region (first, region_num)
rtx *first;
int region_num;
{
rtx insn;
int rnum;
for (insn = *first; insn; insn = NEXT_INSN (insn))
{
if ((GET_CODE (insn) == NOTE) &&
(NOTE_LINE_NUMBER (insn) == NOTE_INSN_EH_REGION_BEG))
{
rnum = NOTE_BLOCK_NUMBER (insn);
insn_eh_region[INSN_UID (insn)] = rnum;
insn = NEXT_INSN (insn);
set_insn_eh_region (&insn, rnum);
/* Upon return, insn points to the EH_REGION_END of nested region */
continue;
}
insn_eh_region[INSN_UID (insn)] = region_num;
if ((GET_CODE (insn) == NOTE) &&
(NOTE_LINE_NUMBER (insn) == NOTE_INSN_EH_REGION_END))
break;
}
*first = insn;
}
/* Free the insn table, an make sure it cannot be used again. */
void free_insn_eh_region ()
{
if (!doing_eh (0))
return;
if (insn_eh_region)
{
free (insn_eh_region);
insn_eh_region = (int *)0;
}
}
/* Initialize the table. max_uid must be calculated and handed into
this routine. If it is unavailable, passing a value of 0 will
cause this routine to calculate it as well. */
void init_insn_eh_region (first, max_uid)
rtx first;
int max_uid;
{
rtx insn;
if (!doing_eh (0))
return;
if (insn_eh_region)
free_insn_eh_region();
if (max_uid == 0)
for (insn = first; insn; insn = NEXT_INSN (insn))
if (INSN_UID (insn) > max_uid) /* find largest UID */
max_uid = INSN_UID (insn);
maximum_uid = max_uid;
insn_eh_region = (int *) malloc ((max_uid + 1) * sizeof (int));
insn = first;
set_insn_eh_region (&insn, 0);
}
/* Check whether 2 instructions are within the same region. */
int in_same_eh_region(insn1, insn2)
rtx insn1,insn2;
{
int ret, uid1, uid2;
/* If no exceptions, instructions are always in same region. */
if (!doing_eh (0))
return 1;
/* If the table isn't allocated, assume the worst. */
if (!insn_eh_region)
return 0;
uid1 = INSN_UID (insn1);
uid2 = INSN_UID (insn2);
/* if instructions have been allocated beyond the end, either
the table is out of date, or this is a late addition, or
something... Assume the worst. */
if (uid1 > maximum_uid || uid2 > maximum_uid)
return 0;
ret = (insn_eh_region[uid1] == insn_eh_region[uid2]);
return ret;
}