| From d626297e87e19251a284ea1e9360e831b48999ca Mon Sep 17 00:00:00 2001 |
| From: mpf <mpf@138bc75d-0d04-0410-961f-82ee72b054a4> |
| Date: Thu, 4 Sep 2014 08:32:05 +0000 |
| Subject: [PATCH] Add target hook to override DWARF2 frame register size |
| |
| 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. |
| |
| |
| |
| git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@214898 138bc75d-0d04-0410-961f-82ee72b054a4 |
| |
| Signed-off-by: Khem Raj <raj.khem@gmail.com> |
| Upstream-Status: Backport [gcc 5.0] |
| |
| --- |
| gcc/ChangeLog | 10 ++++++++++ |
| gcc/doc/tm.texi | 7 +++++++ |
| gcc/doc/tm.texi.in | 2 ++ |
| gcc/dwarf2cfi.c | 4 +--- |
| gcc/target.def | 11 +++++++++++ |
| gcc/targhooks.c | 13 +++++++++++++ |
| gcc/targhooks.h | 1 + |
| 7 files changed, 45 insertions(+), 3 deletions(-) |
| |
| Index: gcc-4.9.2/gcc/doc/tm.texi |
| =================================================================== |
| --- gcc-4.9.2.orig/gcc/doc/tm.texi |
| +++ gcc-4.9.2/gcc/doc/tm.texi |
| @@ -9017,6 +9017,13 @@ register in Dwarf. Otherwise, this hook |
| 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 |
| Index: gcc-4.9.2/gcc/doc/tm.texi.in |
| =================================================================== |
| --- gcc-4.9.2.orig/gcc/doc/tm.texi.in |
| +++ gcc-4.9.2/gcc/doc/tm.texi.in |
| @@ -6745,6 +6745,8 @@ the target supports DWARF 2 frame unwind |
| |
| @hook TARGET_DWARF_REGISTER_SPAN |
| |
| +@hook TARGET_DWARF_FRAME_REG_MODE |
| + |
| @hook TARGET_INIT_DWARF_REG_SIZES_EXTRA |
| |
| @hook TARGET_ASM_TTYPE |
| Index: gcc-4.9.2/gcc/dwarf2cfi.c |
| =================================================================== |
| --- gcc-4.9.2.orig/gcc/dwarf2cfi.c |
| +++ gcc-4.9.2/gcc/dwarf2cfi.c |
| @@ -271,11 +271,9 @@ expand_builtin_init_dwarf_reg_sizes (tre |
| 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) |
| Index: gcc-4.9.2/gcc/target.def |
| =================================================================== |
| --- gcc-4.9.2.orig/gcc/target.def |
| +++ gcc-4.9.2/gcc/target.def |
| @@ -3218,6 +3218,17 @@ If not defined, the default is to return |
| 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 |
| Index: gcc-4.9.2/gcc/targhooks.c |
| =================================================================== |
| --- gcc-4.9.2.orig/gcc/targhooks.c |
| +++ gcc-4.9.2/gcc/targhooks.c |
| @@ -1438,6 +1438,19 @@ 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. */ |
| |
| Index: gcc-4.9.2/gcc/targhooks.h |
| =================================================================== |
| --- gcc-4.9.2.orig/gcc/targhooks.h |
| +++ gcc-4.9.2/gcc/targhooks.h |
| @@ -194,6 +194,7 @@ extern int default_label_align_max_skip |
| 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 void *default_get_pch_validity (size_t *); |