139 lines
5.2 KiB
Diff
139 lines
5.2 KiB
Diff
From d626297e87e19251a284ea1e9360e831b48999ca Mon Sep 17 00:00:00 2001
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From: mpf <mpf@138bc75d-0d04-0410-961f-82ee72b054a4>
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Date: Thu, 4 Sep 2014 08:32:05 +0000
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Subject: [PATCH] Add target hook to override DWARF2 frame register size
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gcc/
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* target.def (TARGET_DWARF_FRAME_REG_MODE): New target hook.
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* targhooks.c (default_dwarf_frame_reg_mode): New function.
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* targhooks.h (default_dwarf_frame_reg_mode): New prototype.
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* doc/tm.texi.in (TARGET_DWARF_FRAME_REG_MODE): Document.
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* doc/tm.texi: Regenerate.
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* dwarf2cfi.c (expand_builtin_init_dwarf_reg_sizes): Abstract mode
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selection logic to default_dwarf_frame_reg_mode.
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git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@214898 138bc75d-0d04-0410-961f-82ee72b054a4
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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Upstream-Status: Backport [gcc 5.0]
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---
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gcc/ChangeLog | 10 ++++++++++
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gcc/doc/tm.texi | 7 +++++++
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gcc/doc/tm.texi.in | 2 ++
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gcc/dwarf2cfi.c | 4 +---
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gcc/target.def | 11 +++++++++++
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gcc/targhooks.c | 13 +++++++++++++
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gcc/targhooks.h | 1 +
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7 files changed, 45 insertions(+), 3 deletions(-)
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Index: gcc-4.9.2/gcc/doc/tm.texi
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===================================================================
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--- gcc-4.9.2.orig/gcc/doc/tm.texi
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+++ gcc-4.9.2/gcc/doc/tm.texi
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@@ -9017,6 +9017,13 @@ register in Dwarf. Otherwise, this hook
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If not defined, the default is to return @code{NULL_RTX}.
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@end deftypefn
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+@deftypefn {Target Hook} {enum machine_mode} TARGET_DWARF_FRAME_REG_MODE (int @var{regno})
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+Given a register, this hook should return the mode which the
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+corresponding Dwarf frame register should have. This is normally
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+used to return a smaller mode than the raw mode to prevent call
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+clobbered parts of a register altering the frame register size
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+@end deftypefn
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+
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@deftypefn {Target Hook} void TARGET_INIT_DWARF_REG_SIZES_EXTRA (tree @var{address})
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If some registers are represented in Dwarf-2 unwind information in
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multiple pieces, define this hook to fill in information about the
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Index: gcc-4.9.2/gcc/doc/tm.texi.in
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===================================================================
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--- gcc-4.9.2.orig/gcc/doc/tm.texi.in
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+++ gcc-4.9.2/gcc/doc/tm.texi.in
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@@ -6745,6 +6745,8 @@ the target supports DWARF 2 frame unwind
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@hook TARGET_DWARF_REGISTER_SPAN
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+@hook TARGET_DWARF_FRAME_REG_MODE
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+
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@hook TARGET_INIT_DWARF_REG_SIZES_EXTRA
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@hook TARGET_ASM_TTYPE
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Index: gcc-4.9.2/gcc/dwarf2cfi.c
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===================================================================
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--- gcc-4.9.2.orig/gcc/dwarf2cfi.c
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+++ gcc-4.9.2/gcc/dwarf2cfi.c
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@@ -271,11 +271,9 @@ expand_builtin_init_dwarf_reg_sizes (tre
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if (rnum < DWARF_FRAME_REGISTERS)
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{
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HOST_WIDE_INT offset = rnum * GET_MODE_SIZE (mode);
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- enum machine_mode save_mode = reg_raw_mode[i];
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HOST_WIDE_INT size;
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+ enum machine_mode save_mode = targetm.dwarf_frame_reg_mode (i);
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- if (HARD_REGNO_CALL_PART_CLOBBERED (i, save_mode))
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- save_mode = choose_hard_reg_mode (i, 1, true);
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if (dnum == DWARF_FRAME_RETURN_COLUMN)
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{
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if (save_mode == VOIDmode)
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Index: gcc-4.9.2/gcc/target.def
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===================================================================
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--- gcc-4.9.2.orig/gcc/target.def
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+++ gcc-4.9.2/gcc/target.def
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@@ -3218,6 +3218,17 @@ If not defined, the default is to return
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rtx, (rtx reg),
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hook_rtx_rtx_null)
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+/* Given a register return the mode of the corresponding DWARF frame
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+ register. */
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+DEFHOOK
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+(dwarf_frame_reg_mode,
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+ "Given a register, this hook should return the mode which the\n\
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+corresponding Dwarf frame register should have. This is normally\n\
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+used to return a smaller mode than the raw mode to prevent call\n\
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+clobbered parts of a register altering the frame register size",
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+ enum machine_mode, (int regno),
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+ default_dwarf_frame_reg_mode)
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+
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/* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
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entries not corresponding directly to registers below
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FIRST_PSEUDO_REGISTER, this hook should generate the necessary
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Index: gcc-4.9.2/gcc/targhooks.c
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===================================================================
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--- gcc-4.9.2.orig/gcc/targhooks.c
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+++ gcc-4.9.2/gcc/targhooks.c
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@@ -1438,6 +1438,19 @@ default_debug_unwind_info (void)
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return UI_NONE;
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}
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+/* Determine the correct mode for a Dwarf frame register that represents
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+ register REGNO. */
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+
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+enum machine_mode
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+default_dwarf_frame_reg_mode (int regno)
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+{
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+ enum machine_mode save_mode = reg_raw_mode[regno];
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+
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+ if (HARD_REGNO_CALL_PART_CLOBBERED (regno, save_mode))
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+ save_mode = choose_hard_reg_mode (regno, 1, true);
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+ return save_mode;
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+}
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+
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/* To be used by targets where reg_raw_mode doesn't return the right
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mode for registers used in apply_builtin_return and apply_builtin_arg. */
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Index: gcc-4.9.2/gcc/targhooks.h
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===================================================================
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--- gcc-4.9.2.orig/gcc/targhooks.h
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+++ gcc-4.9.2/gcc/targhooks.h
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@@ -194,6 +194,7 @@ extern int default_label_align_max_skip
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extern int default_jump_align_max_skip (rtx);
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extern section * default_function_section(tree decl, enum node_frequency freq,
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bool startup, bool exit);
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+extern enum machine_mode default_dwarf_frame_reg_mode (int);
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extern enum machine_mode default_get_reg_raw_mode (int);
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extern void *default_get_pch_validity (size_t *);
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