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dwarf2out.c (dwarf2out_frame_debug_expr): If we store the CFA register in the stack and later in another register...

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* dwarf2out.c (dwarf2out_frame_debug_expr): If we store the CFA
        register in the stack and later in another register, use the new
        register.

From-SVN: r35036
This commit is contained in:
Jason Merrill 2000-07-14 13:40:38 -04:00
parent 30f747d077
commit 626d1efd40
2 changed files with 23 additions and 3 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,9 @@
2000-07-14 Jason Merrill <jason@redhat.com>
* dwarf2out.c (dwarf2out_frame_debug_expr): If we store the CFA
register in the stack and later in another register, use the new
register.
Fri Jul 14 10:25:53 2000 Clinton Popetz <cpopetz@cygnus.com>
* config/mips/mips.md: (absdi2): Handle sign_extend for
@ -391,6 +397,7 @@ Tue Jul 11 16:26:17 2000 Clinton Popetz <cpopetz@cygnus.com>
* cpp.texi: Update.
>>>>>>> 1.7094
2000-07-11 Neil Booth <NeilB@earthling.net>
* cppinit.c: (cpp_reader_init): Allow digraphs by default.

19
gcc/dwarf2out.c
View File

@ -626,7 +626,8 @@ expand_builtin_init_dwarf_reg_sizes (address)
rtx addr = expand_expr (address, NULL_RTX, VOIDmode, 0);
rtx mem = gen_rtx_MEM (mode, addr);
for (i = 0; i < DWARF_FRAME_REGISTERS; ++i)
i = MAX (FIRST_PSEUDO_REGISTER, DWARF_FRAME_REGISTERS);
while (i--)
{
int offset = DWARF_FRAME_REGNUM (i) * GET_MODE_SIZE (mode);
int size = GET_MODE_SIZE (reg_raw_mode[i]);
@ -1208,6 +1209,11 @@ static unsigned cfa_temp_reg;
/* A temporary value used in adjusting SP or setting up the store_reg. */
static long cfa_temp_value;
/* If we see a store of the CFA register, remember it in case we later also
copy it into another register. The ARM saves the old SP in the stack,
but it also has a usable FP. */
static unsigned cfa_old_reg;
/* Record call frame debugging information for an expression, which either
sets SP or FP (adjusting how we calculate the frame address) or saves a
register to the stack. */
@ -1257,7 +1263,10 @@ dwarf2out_frame_debug_expr (expr, label)
{
/* Setting FP from SP. */
case REG:
if (cfa.reg != (unsigned) REGNO (src))
if (cfa.reg == (unsigned) REGNO (src)
|| (cfa.indirect && cfa_old_reg == (unsigned) REGNO (src)))
/* OK */;
else
abort ();
/* We used to require that dest be either SP or FP, but the
@ -1265,6 +1274,7 @@ dwarf2out_frame_debug_expr (expr, label)
FP. So we just rely on the backends to only set
RTX_FRAME_RELATED_P on appropriate insns. */
cfa.reg = REGNO (dest);
cfa.indirect = 0;
break;
case PLUS:
@ -1376,7 +1386,9 @@ dwarf2out_frame_debug_expr (expr, label)
going to have to use an indrect mechanism. */
if (REGNO (src) != STACK_POINTER_REGNUM
&& REGNO (src) != HARD_FRAME_POINTER_REGNUM
&& (unsigned) REGNO (src) == cfa.reg)
&& (unsigned) REGNO (src) == cfa.reg
/* Temporary KLUDGE to make ARM work. */
&& GET_CODE (XEXP (dest, 0)) != PRE_DEC)
{
/* We currently allow this to be ONLY a MEM or MEM + offset. */
rtx x = XEXP (dest, 0);
@ -1390,6 +1402,7 @@ dwarf2out_frame_debug_expr (expr, label)
}
if (GET_CODE (x) != REG)
abort ();
cfa_old_reg = cfa.reg;
cfa.reg = (unsigned) REGNO (x);
cfa.base_offset = offset;
cfa.indirect = 1;