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tm.texi: Document TARGET_DWARF_REGISTER_SPAN. 

2003-03-05  Aldy Hernandez  <aldyh@redhat.com>

        * doc/tm.texi: Document TARGET_DWARF_REGISTER_SPAN.

        * config/rs6000/rs6000.c (rs6000_dwarf_register_span): New.

        * hooks.c (hook_rtx_rtx_null): New.

        * hooks.h (hook_rtx_rtx_null): Protoize.

        * target-def.h (TARGET_DWARF_REGISTER_SPAN): New macro.
        (TARGET_INITIALIZER): Add TARGET_DWARF_REGISTER_SPAN.

        * target.h (struct gcc_target): Add dwarf_register_span.

        * dwarf2out.c (multiple_reg_loc_descriptor): New.
        (one_reg_loc_descriptor): New.
        (reg_loc_descriptor): Add support for values that span more than
        one register.

From-SVN: r63870
This commit is contained in:
Aldy Hernandez 2003-03-05 22:37:52 +00:00 committed by Aldy Hernandez
parent dd6eaaed37
commit 967143957e
8 changed files with 150 additions and 6 deletions
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20
gcc/ChangeLog
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@ -1,3 +1,23 @@
2003-03-05 Aldy Hernandez <aldyh@redhat.com>
* doc/tm.texi: Document TARGET_DWARF_REGISTER_SPAN.
* config/rs6000/rs6000.c (rs6000_dwarf_register_span): New.
* hooks.c (hook_rtx_rtx_null): New.
* hooks.h (hook_rtx_rtx_null): Protoize.
* target-def.h (TARGET_DWARF_REGISTER_SPAN): New macro.
(TARGET_INITIALIZER): Add TARGET_DWARF_REGISTER_SPAN.
* target.h (struct gcc_target): Add dwarf_register_span.
* dwarf2out.c (multiple_reg_loc_descriptor): New.
(one_reg_loc_descriptor): New.
(reg_loc_descriptor): Add support for values that span more than
one register.
Wed Mar 5 23:16:57 CET 2003 Jan Hubicka <jh@suse.cz>
* Makefile.in (calls.o, toplev.o alias.o): Depend on cgraph.h

28
gcc/config/rs6000/rs6000.c
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@ -268,6 +268,7 @@ static rtx generate_set_vrsave PARAMS ((rtx, rs6000_stack_t *, int));
static void altivec_frame_fixup PARAMS ((rtx, rtx, HOST_WIDE_INT));
static int easy_vector_constant PARAMS ((rtx));
static bool is_ev64_opaque_type PARAMS ((tree));
static rtx rs6000_dwarf_register_span PARAMS ((rtx));
/* Hash table stuff for keeping track of TOC entries. */
@ -421,6 +422,9 @@ static const char alt_reg_names[][8] =
#undef TARGET_VECTOR_OPAQUE_P
#define TARGET_VECTOR_OPAQUE_P is_ev64_opaque_type
#undef TARGET_DWARF_REGISTER_SPAN
#define TARGET_DWARF_REGISTER_SPAN rs6000_dwarf_register_span
struct gcc_target targetm = TARGET_INITIALIZER;
/* Override command line options. Mostly we process the processor
@ -13601,4 +13605,28 @@ is_ev64_opaque_type (type)
"__ev64_opaque__") == 0);
}
static rtx
rs6000_dwarf_register_span (reg)
rtx reg;
{
unsigned regno;
if (!TARGET_SPE || !SPE_VECTOR_MODE (GET_MODE (reg)))
return NULL_RTX;
regno = REGNO (reg);
/* The duality of the SPE register size wreaks all kinds of havoc.
This is a way of distinguishing r0 in 32-bits from r0 in
64-bits. */
return
gen_rtx_PARALLEL (VOIDmode,
gen_rtvec (2,
gen_rtx_REG (SImode, regno),
/* Who, where, what? 1200? This
will get changed to a sane value
when the SPE ABI finalizes. */
gen_rtx_REG (SImode, regno + 1200)));
}
#include "gt-rs6000.h"

9
gcc/doc/tm.texi
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@ -7610,6 +7610,15 @@ Default value is false if @code{EH_FRAME_SECTION_NAME} is defined, and
true otherwise.
@end deftypevar
@deftypefn {Target Hook} rtx TARGET_DWARF_REGISTER_SPAN (rtx @var{reg})
Given a register, this hook should return a parallel of registers to
represent where to find the register pieces. Define this hook if the
register and its mode are represented in Dwarf in non-contiguous
locations, or if the register should be represented in more than one
register in Dwarf. Otherwise, this hook should return @code{NULL_RTX}.
If not defined, the default is to return @code{NULL_RTX}.
@end deftypefn
@node Alignment Output
@subsection Assembler Commands for Alignment

80
gcc/dwarf2out.c
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@ -3752,6 +3752,8 @@ static dw_die_ref modified_type_die PARAMS ((tree, int, int, dw_die_ref));
static int type_is_enum PARAMS ((tree));
static unsigned int reg_number PARAMS ((rtx));
static dw_loc_descr_ref reg_loc_descriptor PARAMS ((rtx));
static dw_loc_descr_ref one_reg_loc_descriptor PARAMS ((unsigned int));
static dw_loc_descr_ref multiple_reg_loc_descriptor PARAMS ((rtx, rtx));
static dw_loc_descr_ref int_loc_descriptor PARAMS ((HOST_WIDE_INT));
static dw_loc_descr_ref based_loc_descr PARAMS ((unsigned, long));
static int is_based_loc PARAMS ((rtx));
@ -8155,24 +8157,90 @@ reg_number (rtl)
}
/* Return a location descriptor that designates a machine register or
zero if there is no such. */
zero if there is none. */
static dw_loc_descr_ref
reg_loc_descriptor (rtl)
rtx rtl;
{
dw_loc_descr_ref loc_result = NULL;
unsigned reg;
rtx regs;
if (REGNO (rtl) >= FIRST_PSEUDO_REGISTER)
return 0;
reg = reg_number (rtl);
if (reg <= 31)
loc_result = new_loc_descr (DW_OP_reg0 + reg, 0, 0);
else
loc_result = new_loc_descr (DW_OP_regx, reg, 0);
regs = (*targetm.dwarf_register_span) (rtl);
if (HARD_REGNO_NREGS (reg, GET_MODE (rtl)) > 1
|| regs)
return multiple_reg_loc_descriptor (rtl, regs);
else
return one_reg_loc_descriptor (reg);
}
/* Return a location descriptor that designates a machine register for
a given hard register number. */
static dw_loc_descr_ref
one_reg_loc_descriptor (regno)
unsigned int regno;
{
if (regno <= 31)
return new_loc_descr (DW_OP_reg0 + regno, 0, 0);
else
return new_loc_descr (DW_OP_regx, regno, 0);
}
/* Given an RTL of a register, return a location descriptor that
designates a value that spans more than one register. */
static dw_loc_descr_ref
multiple_reg_loc_descriptor (rtl, regs)
rtx rtl, regs;
{
int nregs, size, i;
unsigned reg;
dw_loc_descr_ref loc_result = NULL;
reg = reg_number (rtl);
nregs = HARD_REGNO_NREGS (reg, GET_MODE (rtl));
/* Simple, contiguous registers. */
if (regs == NULL_RTX)
{
size = GET_MODE_SIZE (GET_MODE (rtl)) / nregs;
loc_result = NULL;
while (nregs--)
{
dw_loc_descr_ref t;
++reg;
t = one_reg_loc_descriptor (reg);
add_loc_descr (&loc_result, t);
add_loc_descr (&loc_result, new_loc_descr (DW_OP_piece, size, 0));
}
return loc_result;
}
/* Now onto stupid register sets in non contiguous locations. */
if (GET_CODE (regs) != PARALLEL)
abort ();
size = GET_MODE_SIZE (GET_MODE (XVECEXP (regs, 0, 0)));
loc_result = NULL;
for (i = 0; i < XVECLEN (regs, 0); ++i)
{
dw_loc_descr_ref t;
t = one_reg_loc_descriptor (REGNO (XVECEXP (regs, 0, i)));
add_loc_descr (&loc_result, t);
size = GET_MODE_SIZE (GET_MODE (XVECEXP (regs, 0, 0)));
add_loc_descr (&loc_result, new_loc_descr (DW_OP_piece, size, 0));
}
return loc_result;
}

7
gcc/hooks.c
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@ -157,3 +157,10 @@ hook_rtx_rtx_identity (x)
return x;
}
/* Generic hook that takes an rtx and returns NULL_RTX. */
rtx
hook_rtx_rtx_null (x)
rtx x ATTRIBUTE_UNUSED;
{
return 0;
}

1
gcc/hooks.h
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@ -46,5 +46,6 @@ bool default_can_output_mi_thunk_no_vcall
bool hook_bool_tree_tree_false PARAMS ((tree, tree));
rtx hook_rtx_rtx_identity PARAMS ((rtx));
rtx hook_rtx_rtx_null PARAMS ((rtx));
#endif

3
gcc/target-def.h
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@ -140,6 +140,8 @@ Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#endif
#endif
#define TARGET_DWARF_REGISTER_SPAN hook_rtx_rtx_null
#ifndef TARGET_ASM_EXCEPTION_SECTION
#define TARGET_ASM_EXCEPTION_SECTION default_exception_section
#endif
@ -310,6 +312,7 @@ Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
TARGET_VECTOR_OPAQUE_P, \
TARGET_RTX_COSTS, \
TARGET_ADDRESS_COST, \
TARGET_DWARF_REGISTER_SPAN, \
TARGET_HAVE_NAMED_SECTIONS, \
TARGET_HAVE_CTORS_DTORS, \
TARGET_HAVE_TLS, \

8
gcc/target.h
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@ -334,6 +334,14 @@ struct gcc_target
invalid addresses. */
int (* address_cost) PARAMS ((rtx x));
/* Given a register, this hook should return a parallel of registers
to represent where to find the register pieces. Define this hook
if the register and its mode are represented in Dwarf in
non-contiguous locations, or if the register should be
represented in more than one register in Dwarf. Otherwise, this
hook should return NULL_RTX. */
rtx (* dwarf_register_span) PARAMS ((rtx));
/* Leave the boolean fields at the end. */
/* True if arbitrary sections are supported. */