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Generate REG_FRAME_RELATED_EXPR notes that are compatible with

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dwarf2out_frame_debug_expt.

From-SVN: r35233
This commit is contained in:
Nick Clifton 2000-07-24 19:01:55 +00:00 committed by Nick Clifton
parent e09bbb2535
commit 87e27392e9
2 changed files with 59 additions and 9 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2000-07-24 Nick Clifton <nickc@cygnus.com>
* config/arm/arm.c (emit_multi_reg_push): Generate a
REG_FRAME_RELEATED_NOTE that is compatable with the code in
dwarf2out_debug_frame_expr.
2000-07-24 Jason Merrill <jason@redhat.com>
* dwarf2out.c: Complain if DWARF2_DEBUGGING_INFO is defined without

62
gcc/config/arm/arm.c
View File

@ -93,6 +93,7 @@ static Mfix * create_fix_barrier PARAMS ((Mfix *, Hint));
static void push_minipool_barrier PARAMS ((rtx, Hint));
static void push_minipool_fix PARAMS ((rtx, Hint, rtx *, Mmode, rtx));
static void note_invalid_constants PARAMS ((rtx, Hint));
static int current_file_function_operand PARAMS ((rtx));
#undef Hint
#undef Mmode
@ -1822,7 +1823,7 @@ arm_is_longcall_p (sym_ref, call_cookie, call_symbol)
if (TARGET_LONG_CALLS && flag_function_sections)
return 1;
if (current_file_function_operand (sym_ref, VOIDmode))
if (current_file_function_operand (sym_ref))
return 0;
return (call_cookie & CALL_LONG)
@ -7067,6 +7068,7 @@ emit_multi_reg_push (mask)
int i, j;
rtx par;
rtx dwarf;
int dwarf_par_index;
rtx tmp, reg;
for (i = 0; i <= LAST_ARM_REGNUM; i++)
@ -7076,9 +7078,42 @@ emit_multi_reg_push (mask)
if (num_regs == 0 || num_regs > 16)
abort ();
/* For the body of the insn we are going to generate an UNSPEC in
parallel with several USEs. This allows the insn to be recognised
by the push_multi pattern in the arm.md file. The insn looks
something like this:
(parallel [
(set (mem:BLK (pre_dec:BLK (reg:SI sp))) (unspec:BLK [(reg:SI r4)] 2))
(use (reg:SI 11 fp))
(use (reg:SI 12 ip))
(use (reg:SI 14 lr))
(use (reg:SI 15 pc))
])
For the frame note however, we try to be more explicit and actually
show each register being stored into the stack frame, plus a (single)
decrement of the stack pointer. We do it this way in order to be
friendly to the stack unwinding code, which only wants to see a single
stack decrement per instruction. The RTL we generate for the note looks
something like this:
(sequence [
(set (reg:SI sp) (plus:SI (reg:SI sp) (const_int -20)))
(set (mem:SI (reg:SI sp)) (reg:SI r4))
(set (mem:SI (plus:SI (reg:SI sp) (const_int 4))) (reg:SI fp))
(set (mem:SI (plus:SI (reg:SI sp) (const_int 8))) (reg:SI ip))
(set (mem:SI (plus:SI (reg:SI sp) (const_int 12))) (reg:SI lr))
(set (mem:SI (plus:SI (reg:SI sp) (const_int 16))) (reg:SI pc))
])
This sequence is used both by the code to support stack unwinding for
exceptions handlers and the code to generate dwarf2 frame debugging. */
par = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (num_regs));
dwarf = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (num_regs));
dwarf = gen_rtx_SEQUENCE (VOIDmode, rtvec_alloc (num_regs + 1));
RTX_FRAME_RELATED_P (dwarf) = 1;
dwarf_par_index = 1;
for (i = 0; i <= LAST_ARM_REGNUM; i++)
{
@ -7096,12 +7131,11 @@ emit_multi_reg_push (mask)
2));
tmp = gen_rtx_SET (VOIDmode,
gen_rtx_MEM (SImode,
gen_rtx_PRE_DEC (BLKmode,
stack_pointer_rtx)),
gen_rtx_MEM (SImode, stack_pointer_rtx),
reg);
RTX_FRAME_RELATED_P (tmp) = 1;
XVECEXP (dwarf, 0, num_regs - 1) = tmp;
XVECEXP (dwarf, 0, dwarf_par_index) = tmp;
dwarf_par_index ++;
break;
}
@ -7117,17 +7151,27 @@ emit_multi_reg_push (mask)
tmp = gen_rtx_SET (VOIDmode,
gen_rtx_MEM (SImode,
gen_rtx_PRE_DEC (BLKmode,
stack_pointer_rtx)),
gen_rtx_PLUS (SImode,
stack_pointer_rtx,
GEN_INT (4 * j))),
reg);
RTX_FRAME_RELATED_P (tmp) = 1;
XVECEXP (dwarf, 0, num_regs - j - 1) = tmp;
XVECEXP (dwarf, 0, dwarf_par_index ++) = tmp;
j++;
}
}
par = emit_insn (par);
tmp = gen_rtx_SET (SImode,
stack_pointer_rtx,
gen_rtx_PLUS (SImode,
stack_pointer_rtx,
GEN_INT (-4 * num_regs)));
RTX_FRAME_RELATED_P (tmp) = 1;
XVECEXP (dwarf, 0, 0) = tmp;
REG_NOTES (par) = gen_rtx_EXPR_LIST (REG_FRAME_RELATED_EXPR, dwarf,
REG_NOTES (par));
return par;