/* Allocate and read RTL for GNU C Compiler.
Copyright (C) 1987, 1988, 1991 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
/* Obstack used for allocating RTL objects.
Between functions, this is the permanent_obstack.
While parsing and expanding a function, this is maybepermanent_obstack
so we can save it if it is an inline function.
During optimization and output, this is function_obstack. */
extern struct obstack
*rtl_obstack
;
#if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT
/* Indexed by rtx code, gives number of operands for an rtx with that code.
Does NOT include rtx header data (code and links).
This array is initialized in init_rtl. */
int rtx_length
[NUM_RTX_CODE
+ 1];
/* Indexed by rtx code, gives the name of that kind of rtx, as a C string. */
#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) NAME ,
#include "rtl.def" /* rtl expressions are documented here */
/* Indexed by machine mode, gives the name of that machine mode.
This name does not include the letters "mode". */
#define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) NAME,
char *mode_name
[(int) MAX_MACHINE_MODE
] = {
/* Indexed by machine mode, gives the length of the mode, in bytes.
GET_MODE_CLASS uses this. */
#define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) CLASS,
enum mode_class mode_class
[(int) MAX_MACHINE_MODE
] = {
/* Indexed by machine mode, gives the length of the mode, in bytes.
GET_MODE_SIZE uses this. */
#define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) SIZE,
int mode_size
[(int) MAX_MACHINE_MODE
] = {
/* Indexed by machine mode, gives the length of the mode's subunit.
GET_MODE_UNIT_SIZE uses this. */
#define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) UNIT,
int mode_unit_size
[(int) MAX_MACHINE_MODE
] = {
#include "machmode.def" /* machine modes are documented here */
/* Indexed by machine mode, gives next wider natural mode
(QI -> HI -> SI -> DI, etc.) Widening multiply instructions
#define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) \
(enum machine_mode) WIDER,
enum machine_mode mode_wider_mode
[(int) MAX_MACHINE_MODE
] = {
#include "machmode.def" /* machine modes are documented here */
/* Indexed by mode class, gives the narrowest mode for each class. */
enum machine_mode class_narrowest_mode
[(int) MAX_MODE_CLASS
];
/* Commonly used modes. */
enum machine_mode byte_mode
; /* Mode whose width is BITS_PER_UNIT */
enum machine_mode word_mode
; /* Mode whose width is BITS_PER_WORD */
/* Indexed by rtx code, gives a sequence of operand-types for
rtx's of that code. The sequence is a C string in which
each character describes one operand. */
can cause a warning message
"0" field is unused (or used in a phase-dependent manner)
"n" like "i", but prints entries from `note_insn_name'
"w" an integer of width HOST_BITS_PER_WIDE_INT
"s" a pointer to a string
"S" like "s", but optional:
the containing rtx may end before this operand
"e" a pointer to an rtl expression
"E" a pointer to a vector that points to a number of rtl expressions
prints a list of the rtl expressions
"V" like "E", but optional:
the containing rtx may end before this operand
"u" a pointer to another insn
prints the uid of the insn. */
#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) FORMAT ,
#include "rtl.def" /* rtl expressions are defined here */
/* Indexed by rtx code, gives a character representing the "class" of
that rtx code. See rtl.def for documentation on the defined classes. */
#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) CLASS,
#include "rtl.def" /* rtl expressions are defined here */
/* Names for kinds of NOTEs and REG_NOTEs. */
char *note_insn_name
[] = { 0 , "NOTE_INSN_DELETED",
"NOTE_INSN_BLOCK_BEG", "NOTE_INSN_BLOCK_END",
"NOTE_INSN_LOOP_BEG", "NOTE_INSN_LOOP_END",
"NOTE_INSN_FUNCTION_END", "NOTE_INSN_SETJMP",
"NOTE_INSN_LOOP_CONT", "NOTE_INSN_LOOP_VTOP",
"NOTE_INSN_PROLOGUE_END", "NOTE_INSN_EPILOGUE_BEG",
"NOTE_INSN_DELETED_LABEL", "NOTE_INSN_FUNCTION_BEG"};
char *reg_note_name
[] = { "", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_WAS_0",
"REG_EQUAL", "REG_RETVAL", "REG_LIBCALL",
"REG_NONNEG", "REG_NO_CONFLICT", "REG_UNUSED",
"REG_CC_SETTER", "REG_CC_USER", "REG_LABEL",
"REG_DEP_ANTI", "REG_DEP_OUTPUT" };
/* Allocate an rtx vector of N elements.
Store the length, and initialize all elements to zero. */
rt
= (rtvec
) obstack_alloc (rtl_obstack
,
sizeof (struct rtvec_def
)
+ (( n
- 1) * sizeof (rtunion
)));
/* clear out the vector */
rt
->elem
[i
].rtvec
= NULL
; /* @@ not portable due to rtunion */
/* Allocate an rtx of code CODE. The CODE is stored in the rtx;
all the rest is initialized to zero. */
register struct obstack
*ob
= rtl_obstack
;
register int nelts
= GET_RTX_LENGTH (code
);
register int length
= sizeof (struct rtx_def
)
+ (nelts
- 1) * sizeof (rtunion
);
/* This function is called more than any other in GCC,
so we manipulate the obstack directly.
Even though rtx objects are word aligned, we may be sharing an obstack
with tree nodes, which may have to be double-word aligned. So align
our length to the alignment mask in the obstack. */
length
= (length
+ ob
->alignment_mask
) & ~ ob
->alignment_mask
;
if (ob
->chunk_limit
- ob
->next_free
< length
)
_obstack_newchunk (ob
, length
);
rt
= (rtx
)ob
->object_base
;
ob
->object_base
= ob
->next_free
;
/* We want to clear everything up to the FLD array. Normally, this is
one int, but we don't want to assume that and it isn't very portable
length
= (sizeof (struct rtx_def
) - sizeof (rtunion
) - 1) / sizeof (int);
for (; length
>= 0; length
--)
((int *) rt
)[length
] = 0;
/* Create a new copy of an rtx.
Recursively copies the operands of the rtx,
except for those few rtx codes that are sharable. */
register char *format_ptr
;
/* SCRATCH must be shared because they represent distinct values. */
/* CONST can be shared if it contains a SYMBOL_REF. If it contains
a LABEL_REF, it isn't sharable. */
if (GET_CODE (XEXP (orig
, 0)) == PLUS
&& GET_CODE (XEXP (XEXP (orig
, 0), 0)) == SYMBOL_REF
&& GET_CODE (XEXP (XEXP (orig
, 0), 1)) == CONST_INT
)
/* A MEM with a constant address is not sharable. The problem is that
the constant address may need to be reloaded. If the mem is shared,
then reloading one copy of this mem will cause all copies to appear
to have been reloaded. */
PUT_MODE (copy
, GET_MODE (orig
));
copy
->in_struct
= orig
->in_struct
;
copy
->volatil
= orig
->volatil
;
copy
->unchanging
= orig
->unchanging
;
copy
->integrated
= orig
->integrated
;
format_ptr
= GET_RTX_FORMAT (GET_CODE (copy
));
for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (copy
)); i
++)
XEXP (copy
, i
) = XEXP (orig
, i
);
if (XEXP (orig
, i
) != NULL
)
XEXP (copy
, i
) = copy_rtx (XEXP (orig
, i
));
XEXP (copy
, i
) = XEXP (orig
, i
);
XVEC (copy
, i
) = XVEC (orig
, i
);
if (XVEC (orig
, i
) != NULL
)
XVEC (copy
, i
) = rtvec_alloc (XVECLEN (orig
, i
));
for (j
= 0; j
< XVECLEN (copy
, i
); j
++)
XVECEXP (copy
, i
, j
) = copy_rtx (XVECEXP (orig
, i
, j
));
XWINT (copy
, i
) = XWINT (orig
, i
);
XINT (copy
, i
) = XINT (orig
, i
);
XSTR (copy
, i
) = XSTR (orig
, i
);
/* Similar to `copy_rtx' except that if MAY_SHARE is present, it is
placed in the result directly, rather than being copied. */
copy_most_rtx (orig
, may_share
)
register char *format_ptr
;
PUT_MODE (copy
, GET_MODE (orig
));
copy
->in_struct
= orig
->in_struct
;
copy
->volatil
= orig
->volatil
;
copy
->unchanging
= orig
->unchanging
;
copy
->integrated
= orig
->integrated
;
format_ptr
= GET_RTX_FORMAT (GET_CODE (copy
));
for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (copy
)); i
++)
XEXP (copy
, i
) = XEXP (orig
, i
);
if (XEXP (orig
, i
) != NULL
&& XEXP (orig
, i
) != may_share
)
XEXP (copy
, i
) = copy_most_rtx (XEXP (orig
, i
), may_share
);
XEXP (copy
, i
) = XEXP (orig
, i
);
XVEC (copy
, i
) = XVEC (orig
, i
);
if (XVEC (orig
, i
) != NULL
)
XVEC (copy
, i
) = rtvec_alloc (XVECLEN (orig
, i
));
for (j
= 0; j
< XVECLEN (copy
, i
); j
++)
= copy_most_rtx (XVECEXP (orig
, i
, j
), may_share
);
XWINT (copy
, i
) = XWINT (orig
, i
);
XINT (copy
, i
) = XINT (orig
, i
);
XSTR (copy
, i
) = XSTR (orig
, i
);
/* Subroutines of read_rtx. */
/* Dump code after printing a message. Used when read_rtx finds
dump_and_abort (expected_c
, actual_c
, infile
)
int expected_c
, actual_c
;
"Expected character %c. Found character %c.",
fprintf (stderr
, " At file position: %ld\n", ftell (infile
));
fprintf (stderr
, "Following characters are:\n\t");
for (i
= 0; i
< 200; i
++)
fprintf (stderr
, "Aborting.\n");
/* Read chars from INFILE until a non-whitespace char
and return that. Comments, both Lisp style and C style,
are treated as whitespace.
Tools such as genflags use this function. */
read_skip_spaces (infile
)
while (c
= getc (infile
))
if (c
== ' ' || c
== '\n' || c
== '\t' || c
== '\f')
while ((c
= getc (infile
)) && c
!= '\n') ;
dump_and_abort ('*', c
, infile
);
while (c
= getc (infile
))
if (prevc
== '*' && c
== '/')
/* Read an rtx code name into the buffer STR[].
It is terminated by any of the punctuation chars of rtx printed syntax. */
c
= read_skip_spaces(infile
);
if (c
== ' ' || c
== '\n' || c
== '\t' || c
== '\f')
if (c
== ':' || c
== ')' || c
== ']' || c
== '"' || c
== '/'
fprintf (stderr
, "missing name or number");
dump_and_abort (-1, -1, infile
);
/* Read an rtx in printed representation from INFILE
and return an actual rtx in core constructed accordingly.
read_rtx is not used in the compiler proper, but rather in
the utilities gen*.c that construct C code from machine descriptions. */
register int i
, j
, list_counter
;
register char *format_ptr
;
/* tmp_char is a buffer used for reading decimal integers
and names of rtx types and machine modes.
Therefore, 256 must be enough. */
/* Linked list structure for making RTXs: */
rtx value
; /* Value of this node... */
c
= read_skip_spaces (infile
); /* Should be open paren. */
dump_and_abort ('(', c
, infile
);
read_name (tmp_char
, infile
);
for (i
=0; i
< NUM_RTX_CODE
; i
++) /* @@ might speed this search up */
if (!(strcmp (tmp_char
, GET_RTX_NAME (i
))))
tmp_code
= (RTX_CODE
) i
; /* get value for name */
"Unknown rtx read in rtl.read_rtx(). Code name was %s .",
/* (NIL) stands for an expression that isn't there. */
/* Discard the closeparen. */
while ((c
= getc (infile
)) && c
!= ')');
return_rtx
= rtx_alloc (tmp_code
); /* if we end up with an insn expression
then we free this space below. */
format_ptr
= GET_RTX_FORMAT (GET_CODE (return_rtx
));
/* If what follows is `: mode ', read it and
store the mode in the rtx. */
i
= read_skip_spaces (infile
);
read_name (tmp_char
, infile
);
for (k
= 0; k
< NUM_MACHINE_MODES
; k
++)
if (!strcmp (GET_MODE_NAME (k
), tmp_char
))
PUT_MODE (return_rtx
, (enum machine_mode
) k
);
for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (return_rtx
)); i
++)
/* 0 means a field for internal use only.
Don't expect it to be present in the input. */
XEXP (return_rtx
, i
) = read_rtx (infile
);
/* 'V' is an optional vector: if a closeparen follows,
just store NULL for this element. */
c
= read_skip_spaces (infile
);
XVEC (return_rtx
, i
) = 0;
/* Now process the vector. */
register struct rtx_list
*next_rtx
, *rtx_list_link
;
struct rtx_list
*list_rtx
;
c
= read_skip_spaces (infile
);
dump_and_abort ('[', c
, infile
);
/* add expressions to a list, while keeping a count */
while ((c
= read_skip_spaces (infile
)) && c
!= ']')
rtx_list_link
= (struct rtx_list
*)
alloca (sizeof (struct rtx_list
));
rtx_list_link
->value
= read_rtx (infile
);
list_rtx
= rtx_list_link
;
next_rtx
->next
= rtx_list_link
;
next_rtx
= rtx_list_link
;
/* get vector length and allocate it */
XVEC (return_rtx
, i
) = (list_counter
? rtvec_alloc (list_counter
) : NULL_RTVEC
);
for (j
= 0; j
< list_counter
; j
++,
next_rtx
= next_rtx
->next
)
XVECEXP (return_rtx
, i
, j
) = next_rtx
->value
;
/* close bracket gotten */
/* 'S' is an optional string: if a closeparen follows,
just store NULL for this element. */
c
= read_skip_spaces (infile
);
XSTR (return_rtx
, i
) = 0;
register char *stringbuf
;
c
= read_skip_spaces (infile
);
c
= read_skip_spaces (infile
);
dump_and_abort ('"', c
, infile
);
c
= getc (infile
); /* Read the string */
c
= getc (infile
); /* Read the string */
/* \; makes stuff for a C string constant containing
obstack_grow (rtl_obstack
, "\\n\\t", 4);
obstack_1grow (rtl_obstack
, c
);
obstack_1grow (rtl_obstack
, 0);
stringbuf
= (char *) obstack_finish (rtl_obstack
);
c
= read_skip_spaces (infile
);
dump_and_abort (')', c
, infile
);
XSTR (return_rtx
, i
) = stringbuf
;
read_name (tmp_char
, infile
);
#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
tmp_wide
= atoi (tmp_char
);
tmp_wide
= atol (tmp_char
);
XWINT (return_rtx
, i
) = tmp_wide
;
read_name (tmp_char
, infile
);
tmp_int
= atoi (tmp_char
);
XINT (return_rtx
, i
) = tmp_int
;
"switch format wrong in rtl.read_rtx(). format was: %c.\n",
fprintf (stderr
, "\tfile position: %ld\n", ftell (infile
));
c
= read_skip_spaces (infile
);
dump_and_abort (')', c
, infile
);
/* This is called once per compilation, before any rtx's are constructed.
It initializes the vector `rtx_length', the extra CC modes, if any,
and computes certain commonly-used modes. */
int min_class_size
[(int) MAX_MODE_CLASS
];
for (i
= 0; i
< NUM_RTX_CODE
; i
++)
rtx_length
[i
] = strlen (rtx_format
[i
]);
/* Make CONST_DOUBLE bigger, if real values are bigger than
it normally expects to have room for.
Note that REAL_VALUE_TYPE is not defined by default,
since tree.h is not included. But the default dfn as `double'
i
= sizeof (REAL_VALUE_TYPE
) / sizeof (rtunion
) + 2;
if (rtx_length
[(int) CONST_DOUBLE
] < i
)
char *s
= (char *) xmalloc (i
+ 1);
rtx_length
[(int) CONST_DOUBLE
] = i
;
rtx_format
[(int) CONST_DOUBLE
] = s
;
/* Set the GET_RTX_FORMAT of CONST_DOUBLE to a string
of as many `w's as we now have elements. Subtract two from
the size to account for the 'e' and the '0'. */
for (i
= 2; i
< rtx_length
[(int) CONST_DOUBLE
]; i
++)
for (i
= (int) CCmode
+ 1; i
< (int) MAX_MACHINE_MODE
; i
++)
mode_size
[i
] = mode_size
[(int) CCmode
];
mode_unit_size
[i
] = mode_unit_size
[(int) CCmode
];
mode_wider_mode
[i
- 1] = (enum machine_mode
) i
;
mode_wider_mode
[i
] = VOIDmode
;
/* Find the narrowest mode for each class and compute the word and byte
for (i
= 0; i
< (int) MAX_MODE_CLASS
; i
++)
min_class_size
[i
] = 1000;
for (mode
= VOIDmode
; (int) mode
< (int) MAX_MACHINE_MODE
;
mode
= (enum machine_mode
) ((int) mode
+ 1))
if (GET_MODE_SIZE (mode
) < min_class_size
[(int) GET_MODE_CLASS (mode
)])
class_narrowest_mode
[(int) GET_MODE_CLASS (mode
)] = mode
;
min_class_size
[(int) GET_MODE_CLASS (mode
)] = GET_MODE_SIZE (mode
);
if (GET_MODE_CLASS (mode
) == MODE_INT
&& GET_MODE_BITSIZE (mode
) == BITS_PER_UNIT
&& byte_mode
== VOIDmode
)
if (GET_MODE_CLASS (mode
) == MODE_INT
&& GET_MODE_BITSIZE (mode
) == BITS_PER_WORD
&& word_mode
== VOIDmode
)
gcc_memset (dest
, value
, len
)