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* cfgbuild.c (find_sub_basic_blocks): Handle insns that can throw. 

From-SVN: r45690
This commit is contained in:
Richard Henderson 2001-09-19 11:21:54 -07:00 committed by Richard Henderson
parent e8f9246734
commit f068df3fe6
2 changed files with 47 additions and 21 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2001-09-19 Richard Henderson <rth@redhat.com>
* cfgbuild.c (find_sub_basic_blocks): Handle insns that can throw.
2001-09-18 Catherine Moore <clm@redhat.com>
* config/stormy16/stormy16.h (DEFAULT_PCC_STRUCT_RETURN):

64
gcc/cfgbuild.c
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@ -671,8 +671,8 @@ find_sub_basic_blocks (bb)
{
rtx insn = bb->head;
rtx end = bb->end;
rtx jump_insn = NULL_RTX;
edge falltru = 0;
rtx flow_transfer_insn = NULL_RTX;
edge fallthru = NULL;
basic_block first_bb = bb;
int i;
@ -686,44 +686,66 @@ find_sub_basic_blocks (bb)
while (1)
{
enum rtx_code code = GET_CODE (insn);
switch (code)
{
case BARRIER:
if (!jump_insn)
if (!flow_transfer_insn)
abort ();
break;
/* On code label, split current basic block. */
case CODE_LABEL:
falltru = split_block (bb, PREV_INSN (insn));
if (jump_insn)
bb->end = jump_insn;
bb = falltru->dest;
remove_edge (falltru);
jump_insn = 0;
fallthru = split_block (bb, PREV_INSN (insn));
if (flow_transfer_insn)
bb->end = flow_transfer_insn;
bb = fallthru->dest;
remove_edge (fallthru);
flow_transfer_insn = NULL_RTX;
if (LABEL_ALTERNATE_NAME (insn))
make_edge (ENTRY_BLOCK_PTR, bb, 0);
break;
case INSN:
case JUMP_INSN:
/* In case we've previously split insn on the JUMP_INSN, move the
block header to proper place. */
if (jump_insn)
case CALL_INSN:
/* In case we've previously split an insn that effects a control
flow transfer, move the block header to proper place. */
if (flow_transfer_insn)
{
falltru = split_block (bb, PREV_INSN (insn));
bb->end = jump_insn;
bb = falltru->dest;
remove_edge (falltru);
jump_insn = 0;
fallthru = split_block (bb, PREV_INSN (insn));
bb->end = flow_transfer_insn;
bb = fallthru->dest;
remove_edge (fallthru);
flow_transfer_insn = NULL_RTX;
}
/* We need some special care for those expressions. */
if (GET_CODE (insn) == JUMP_INSN)
if (code == JUMP_INSN)
{
if (GET_CODE (PATTERN (insn)) == ADDR_VEC
|| GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC)
abort();
jump_insn = insn;
flow_transfer_insn = insn;
}
else if (code == CALL_INSN)
{
rtx note;
if (nonlocal_goto_handler_labels
&& (!(note = find_reg_note (insn, REG_EH_REGION, NULL_RTX))
|| INTVAL (XEXP (note, 0)) >= 0))
flow_transfer_insn = insn;
else if (can_throw_internal (insn))
flow_transfer_insn = insn;
else if (SIBLING_CALL_P (insn))
flow_transfer_insn = insn;
else if (find_reg_note (insn, REG_NORETURN, 0))
flow_transfer_insn = insn;
}
else if (flag_non_call_exceptions && can_throw_internal (insn))
flow_transfer_insn = insn;
break;
default:
break;
}
@ -735,8 +757,8 @@ find_sub_basic_blocks (bb)
/* In case expander replaced normal insn by sequence terminating by
return and barrier, or possibly other sequence not behaving like
ordinary jump, we need to take care and move basic block boundary. */
if (jump_insn && GET_CODE (bb->end) != JUMP_INSN)
bb->end = jump_insn;
if (flow_transfer_insn)
bb->end = flow_transfer_insn;
/* We've possibly replaced the conditional jump by conditional jump
followed by cleanup at fallthru edge, so the outgoing edges may