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Add target hook to override DWARF2 frame register size

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gcc/

	* target.def (TARGET_DWARF_FRAME_REG_MODE): New target hook.
	* targhooks.c (default_dwarf_frame_reg_mode): New function.
	* targhooks.h (default_dwarf_frame_reg_mode): New prototype.
	* doc/tm.texi.in (TARGET_DWARF_FRAME_REG_MODE): Document.
	* doc/tm.texi: Regenerate.
	* dwarf2cfi.c (expand_builtin_init_dwarf_reg_sizes): Abstract mode
	selection logic to default_dwarf_frame_reg_mode.

From-SVN: r214898
This commit is contained in:
Matthew Fortune 2014-09-04 08:32:05 +00:00 • committed by Matthew Fortune
parent a0f75fa8c3
commit ff050c66b1
7 changed files with 45 additions and 3 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2014-09-03 Matthew Fortune <matthew.fortune@imgtec.com>
* target.def (TARGET_DWARF_FRAME_REG_MODE): New target hook.
* targhooks.c (default_dwarf_frame_reg_mode): New function.
* targhooks.h (default_dwarf_frame_reg_mode): New prototype.
* doc/tm.texi.in (TARGET_DWARF_FRAME_REG_MODE): Document.
* doc/tm.texi: Regenerate.
* dwarf2cfi.c (expand_builtin_init_dwarf_reg_sizes): Abstract mode
selection logic to default_dwarf_frame_reg_mode.
2014-09-03 Marek Polacek <polacek@redhat.com>
* doc/invoke.texi: Document that -Wlogical-not-parentheses is enabled

7
gcc/doc/tm.texi
View file

@ -8871,6 +8871,13 @@ register in Dwarf. Otherwise, this hook should return @code{NULL_RTX}.
If not defined, the default is to return @code{NULL_RTX}.
@end deftypefn
@deftypefn {Target Hook} {enum machine_mode} TARGET_DWARF_FRAME_REG_MODE (int @var{regno})
Given a register, this hook should return the mode which the
corresponding Dwarf frame register should have. This is normally
used to return a smaller mode than the raw mode to prevent call
clobbered parts of a register altering the frame register size
@end deftypefn
@deftypefn {Target Hook} void TARGET_INIT_DWARF_REG_SIZES_EXTRA (tree @var{address})
If some registers are represented in Dwarf-2 unwind information in
multiple pieces, define this hook to fill in information about the

2
gcc/doc/tm.texi.in
View file

@ -6594,6 +6594,8 @@ the target supports DWARF 2 frame unwind information.
@hook TARGET_DWARF_REGISTER_SPAN
@hook TARGET_DWARF_FRAME_REG_MODE
@hook TARGET_INIT_DWARF_REG_SIZES_EXTRA
@hook TARGET_ASM_TTYPE

4
gcc/dwarf2cfi.c
View file

@ -271,11 +271,9 @@ expand_builtin_init_dwarf_reg_sizes (tree address)
if (rnum < DWARF_FRAME_REGISTERS)
{
HOST_WIDE_INT offset = rnum * GET_MODE_SIZE (mode);
enum machine_mode save_mode = reg_raw_mode[i];
HOST_WIDE_INT size;
enum machine_mode save_mode = targetm.dwarf_frame_reg_mode (i);
if (HARD_REGNO_CALL_PART_CLOBBERED (i, save_mode))
save_mode = choose_hard_reg_mode (i, 1, true);
if (dnum == DWARF_FRAME_RETURN_COLUMN)
{
if (save_mode == VOIDmode)

11
gcc/target.def
View file

@ -3218,6 +3218,17 @@ If not defined, the default is to return @code{NULL_RTX}.",
rtx, (rtx reg),
hook_rtx_rtx_null)
/* Given a register return the mode of the corresponding DWARF frame
register. */
DEFHOOK
(dwarf_frame_reg_mode,
"Given a register, this hook should return the mode which the\n\
corresponding Dwarf frame register should have. This is normally\n\
used to return a smaller mode than the raw mode to prevent call\n\
clobbered parts of a register altering the frame register size",
enum machine_mode, (int regno),
default_dwarf_frame_reg_mode)
/* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
entries not corresponding directly to registers below
FIRST_PSEUDO_REGISTER, this hook should generate the necessary

13
gcc/targhooks.c
View file

@ -1456,6 +1456,19 @@ default_debug_unwind_info (void)
return UI_NONE;
}
/* Determine the correct mode for a Dwarf frame register that represents
register REGNO. */
enum machine_mode
default_dwarf_frame_reg_mode (int regno)
{
enum machine_mode save_mode = reg_raw_mode[regno];
if (HARD_REGNO_CALL_PART_CLOBBERED (regno, save_mode))
save_mode = choose_hard_reg_mode (regno, 1, true);
return save_mode;
}
/* To be used by targets where reg_raw_mode doesn't return the right
mode for registers used in apply_builtin_return and apply_builtin_arg. */

1
gcc/targhooks.h
View file

@ -194,6 +194,7 @@ extern int default_label_align_max_skip (rtx);
extern int default_jump_align_max_skip (rtx);
extern section * default_function_section(tree decl, enum node_frequency freq,
bool startup, bool exit);
extern enum machine_mode default_dwarf_frame_reg_mode (int);
extern enum machine_mode default_get_reg_raw_mode (int);
extern bool default_keep_leaf_when_profiled ();