-/* RTL reader for GNU C Compiler.
- Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002
+/* RTL reader for GCC.
+ Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002,
+ 2003, 2004, 2005, 2007, 2008, 2010
Free Software Foundation, Inc.
This file is part of GCC.
GCC 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) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#include "bconfig.h"
+
+/* Disable rtl checking; it conflicts with the iterator handling. */
+#undef ENABLE_RTL_CHECKING
-#include "hconfig.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "rtl.h"
#include "obstack.h"
#include "hashtab.h"
+#include "read-md.h"
+#include "gensupport.h"
+
+/* One element in a singly-linked list of (integer, string) pairs. */
+struct map_value {
+ struct map_value *next;
+ int number;
+ const char *string;
+};
+
+/* Maps an iterator or attribute name to a list of (integer, string) pairs.
+ The integers are mode or code values; the strings are either C conditions
+ or attribute values. */
+struct mapping {
+ /* The name of the iterator or attribute. */
+ const char *name;
+
+ /* The group (modes or codes) to which the iterator or attribute belongs. */
+ struct iterator_group *group;
+
+ /* Gives a unique number to the attribute or iterator. Numbers are
+ allocated consecutively, starting at 0. */
+ int index;
+
+ /* The list of (integer, string) pairs. */
+ struct map_value *values;
+};
+
+/* A structure for abstracting the common parts of code and mode iterators. */
+struct iterator_group {
+ /* Tables of "mapping" structures, one for attributes and one for iterators. */
+ htab_t attrs, iterators;
+
+ /* The number of "real" modes or codes (and by extension, the first
+ number available for use as an iterator placeholder). */
+ int num_builtins;
+
+ /* Treat the given string as the name of a standard mode or code and
+ return its integer value. */
+ int (*find_builtin) (const char *);
+
+ /* Return true if the given rtx uses the given mode or code. */
+ bool (*uses_iterator_p) (rtx, int);
+
+ /* Make the given rtx use the given mode or code. */
+ void (*apply_iterator) (rtx, int);
+};
+
+/* A structure used to pass data from read_rtx to apply_iterator_traverse
+ via htab_traverse. */
+struct iterator_traverse_data {
+ /* Instruction queue. */
+ rtx queue;
+ /* Attributes seen for modes. */
+ struct map_value *mode_maps;
+ /* The last unknown attribute used as a mode. */
+ const char *unknown_mode_attr;
+};
+
+/* If CODE is the number of a code iterator, return a real rtx code that
+ has the same format. Return CODE otherwise. */
+#define BELLWETHER_CODE(CODE) \
+ ((CODE) < NUM_RTX_CODE ? CODE : bellwether_codes[CODE - NUM_RTX_CODE])
+
+static int find_mode (const char *);
+static bool uses_mode_iterator_p (rtx, int);
+static void apply_mode_iterator (rtx, int);
+static int find_code (const char *);
+static bool uses_code_iterator_p (rtx, int);
+static void apply_code_iterator (rtx, int);
+static const char *apply_iterator_to_string (const char *, struct mapping *, int);
+static rtx apply_iterator_to_rtx (rtx, struct mapping *, int,
+ struct map_value *, const char **);
+static bool uses_iterator_p (rtx, struct mapping *);
+static const char *add_condition_to_string (const char *, const char *);
+static void add_condition_to_rtx (rtx, const char *);
+static int apply_iterator_traverse (void **, void *);
+static struct mapping *add_mapping (struct iterator_group *, htab_t t,
+ const char *);
+static struct map_value **add_map_value (struct map_value **,
+ int, const char *);
+static void initialize_iterators (void);
+static void read_conditions (void);
+static void validate_const_int (const char *);
+static int find_iterator (struct iterator_group *, const char *);
+static struct mapping *read_mapping (struct iterator_group *, htab_t);
+static void check_code_iterator (struct mapping *);
+static rtx read_rtx_code (const char *, struct map_value **);
+static rtx read_nested_rtx (struct map_value **);
+static rtx read_rtx_variadic (struct map_value **, rtx);
+
+/* The mode and code iterator structures. */
+static struct iterator_group modes, codes;
+
+/* Index I is the value of BELLWETHER_CODE (I + NUM_RTX_CODE). */
+static enum rtx_code *bellwether_codes;
+
+/* Implementations of the iterator_group callbacks for modes. */
-#define obstack_chunk_alloc xmalloc
-#define obstack_chunk_free free
+static int
+find_mode (const char *name)
+{
+ int i;
-static htab_t md_constants;
+ for (i = 0; i < NUM_MACHINE_MODES; i++)
+ if (strcmp (GET_MODE_NAME (i), name) == 0)
+ return i;
-static void fatal_with_file_and_line PARAMS ((FILE *, const char *, ...))
- ATTRIBUTE_PRINTF_2 ATTRIBUTE_NORETURN;
-static void fatal_expected_char PARAMS ((FILE *, int, int)) ATTRIBUTE_NORETURN;
-static void read_name PARAMS ((char *, FILE *));
-static char *read_string PARAMS ((struct obstack *, FILE *, int));
-static char *read_quoted_string PARAMS ((struct obstack *, FILE *));
-static char *read_braced_string PARAMS ((struct obstack *, FILE *));
-static void read_escape PARAMS ((struct obstack *, FILE *));
-static unsigned def_hash PARAMS ((const void *));
-static int def_name_eq_p PARAMS ((const void *, const void *));
-static void read_constants PARAMS ((FILE *infile, char *tmp_char));
-static void validate_const_int PARAMS ((FILE *, const char *));
+ fatal_with_file_and_line ("unknown mode `%s'", name);
+}
-/* Subroutines of read_rtx. */
+static bool
+uses_mode_iterator_p (rtx x, int mode)
+{
+ return (int) GET_MODE (x) == mode;
+}
-/* The current line number for the file. */
-int read_rtx_lineno = 1;
+static void
+apply_mode_iterator (rtx x, int mode)
+{
+ PUT_MODE (x, (enum machine_mode) mode);
+}
-/* The filename for aborting with file and line. */
-const char *read_rtx_filename = "<unknown>";
+/* Implementations of the iterator_group callbacks for codes. */
-static void
-fatal_with_file_and_line VPARAMS ((FILE *infile, const char *msg, ...))
+static int
+find_code (const char *name)
{
- char context[64];
- size_t i;
- int c;
+ int i;
+
+ for (i = 0; i < NUM_RTX_CODE; i++)
+ if (strcmp (GET_RTX_NAME (i), name) == 0)
+ return i;
+
+ fatal_with_file_and_line ("unknown rtx code `%s'", name);
+}
- VA_OPEN (ap, msg);
- VA_FIXEDARG (ap, FILE *, infile);
- VA_FIXEDARG (ap, const char *, msg);
+static bool
+uses_code_iterator_p (rtx x, int code)
+{
+ return (int) GET_CODE (x) == code;
+}
- fprintf (stderr, "%s:%d: ", read_rtx_filename, read_rtx_lineno);
- vfprintf (stderr, msg, ap);
- putc ('\n', stderr);
+static void
+apply_code_iterator (rtx x, int code)
+{
+ PUT_CODE (x, (enum rtx_code) code);
+}
- /* Gather some following context. */
- for (i = 0; i < sizeof (context)-1; ++i)
+/* Map a code or mode attribute string P to the underlying string for
+ ITERATOR and VALUE. */
+
+static struct map_value *
+map_attr_string (const char *p, struct mapping *iterator, int value)
+{
+ const char *attr;
+ struct mapping *m;
+ struct map_value *v;
+
+ /* If there's a "iterator:" prefix, check whether the iterator name matches.
+ Set ATTR to the start of the attribute name. */
+ attr = strchr (p, ':');
+ if (attr == 0)
+ attr = p;
+ else
{
- c = getc (infile);
- if (c == EOF)
- break;
- if (c == '\r' || c == '\n')
- break;
- context[i] = c;
+ if (strncmp (p, iterator->name, attr - p) != 0
+ || iterator->name[attr - p] != 0)
+ return 0;
+ attr++;
}
- context[i] = '\0';
- fprintf (stderr, "%s:%d: following context is `%s'\n",
- read_rtx_filename, read_rtx_lineno, context);
+ /* Find the attribute specification. */
+ m = (struct mapping *) htab_find (iterator->group->attrs, &attr);
+ if (m == 0)
+ return 0;
+
+ /* Find the attribute value for VALUE. */
+ for (v = m->values; v != 0; v = v->next)
+ if (v->number == value)
+ break;
- VA_CLOSE (ap);
- exit (1);
+ return v;
}
-/* Dump code after printing a message. Used when read_rtx finds
- invalid data. */
+/* Given an attribute string used as a machine mode, return an index
+ to store in the machine mode to be translated by
+ apply_iterator_to_rtx. */
-static void
-fatal_expected_char (infile, expected_c, actual_c)
- FILE *infile;
- int expected_c, actual_c;
+static unsigned int
+mode_attr_index (struct map_value **mode_maps, const char *string)
{
- fatal_with_file_and_line (infile, "expected character `%c', found `%c'",
- expected_c, actual_c);
+ char *p;
+ struct map_value *mv;
+
+ /* Copy the attribute string into permanent storage, without the
+ angle brackets around it. */
+ obstack_grow0 (&string_obstack, string + 1, strlen (string) - 2);
+ p = XOBFINISH (&string_obstack, char *);
+
+ mv = XNEW (struct map_value);
+ mv->number = *mode_maps == 0 ? 0 : (*mode_maps)->number + 1;
+ mv->string = p;
+ mv->next = *mode_maps;
+ *mode_maps = mv;
+
+ /* We return a code which we can map back into this string: the
+ number of machine modes + the number of mode iterators + the index
+ we just used. */
+ return MAX_MACHINE_MODE + htab_elements (modes.iterators) + mv->number;
}
-/* 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. */
+/* Apply MODE_MAPS to the top level of X, expanding cases where an
+ attribute is used for a mode. ITERATOR is the current iterator we are
+ expanding, and VALUE is the value to which we are expanding it.
+ This sets *UNKNOWN to true if we find a mode attribute which has not
+ yet been defined, and does not change it otherwise. */
-int
-read_skip_spaces (infile)
- FILE *infile;
+static void
+apply_mode_maps (rtx x, struct map_value *mode_maps, struct mapping *iterator,
+ int value, const char **unknown)
{
- int c;
+ unsigned int offset;
+ int indx;
+ struct map_value *pm;
+
+ offset = MAX_MACHINE_MODE + htab_elements (modes.iterators);
+ if (GET_MODE (x) < offset)
+ return;
- while (1)
+ indx = GET_MODE (x) - offset;
+ for (pm = mode_maps; pm; pm = pm->next)
{
- c = getc (infile);
- switch (c)
+ if (pm->number == indx)
{
- case '\n':
- read_rtx_lineno++;
- break;
+ struct map_value *v;
- case ' ': case '\t': case '\f': case '\r':
- break;
+ v = map_attr_string (pm->string, iterator, value);
+ if (v)
+ PUT_MODE (x, (enum machine_mode) find_mode (v->string));
+ else
+ *unknown = pm->string;
+ return;
+ }
+ }
+}
- case ';':
- do
- c = getc (infile);
- while (c != '\n' && c != EOF);
- read_rtx_lineno++;
- break;
+/* Given that ITERATOR is being expanded as VALUE, apply the appropriate
+ string substitutions to STRING. Return the new string if any changes
+ were needed, otherwise return STRING itself. */
- case '/':
- {
- int prevc;
- c = getc (infile);
- if (c != '*')
- fatal_expected_char (infile, '*', c);
+static const char *
+apply_iterator_to_string (const char *string, struct mapping *iterator, int value)
+{
+ char *base, *copy, *p, *start, *end;
+ struct map_value *v;
- prevc = 0;
- while ((c = getc (infile)) && c != EOF)
- {
- if (c == '\n')
- read_rtx_lineno++;
- else if (prevc == '*' && c == '/')
- break;
- prevc = c;
- }
- }
- break;
+ if (string == 0)
+ return string;
- default:
- return c;
- }
+ base = p = copy = ASTRDUP (string);
+ while ((start = strchr (p, '<')) && (end = strchr (start, '>')))
+ {
+ p = start + 1;
+
+ *end = 0;
+ v = map_attr_string (p, iterator, value);
+ *end = '>';
+ if (v == 0)
+ continue;
+
+ /* Add everything between the last copied byte and the '<',
+ then add in the attribute value. */
+ obstack_grow (&string_obstack, base, start - base);
+ obstack_grow (&string_obstack, v->string, strlen (v->string));
+ base = end + 1;
+ }
+ if (base != copy)
+ {
+ obstack_grow (&string_obstack, base, strlen (base) + 1);
+ copy = XOBFINISH (&string_obstack, char *);
+ copy_md_ptr_loc (copy, string);
+ return copy;
}
+ return string;
}
-/* Read an rtx code name into the buffer STR[].
- It is terminated by any of the punctuation chars of rtx printed syntax. */
+/* Return a copy of ORIGINAL in which all uses of ITERATOR have been
+ replaced by VALUE. MODE_MAPS holds information about attribute
+ strings used for modes. This sets *UNKNOWN_MODE_ATTR to the value of
+ an unknown mode attribute, and does not change it otherwise. */
-static void
-read_name (str, infile)
- char *str;
- FILE *infile;
+static rtx
+apply_iterator_to_rtx (rtx original, struct mapping *iterator, int value,
+ struct map_value *mode_maps,
+ const char **unknown_mode_attr)
{
- char *p;
- int c;
+ struct iterator_group *group;
+ const char *format_ptr;
+ int i, j;
+ rtx x;
+ enum rtx_code bellwether_code;
- c = read_skip_spaces (infile);
+ if (original == 0)
+ return original;
- p = str;
- while (1)
- {
- if (c == ' ' || c == '\n' || c == '\t' || c == '\f' || c == '\r')
+ /* Create a shallow copy of ORIGINAL. */
+ bellwether_code = BELLWETHER_CODE (GET_CODE (original));
+ x = rtx_alloc (bellwether_code);
+ memcpy (x, original, RTX_CODE_SIZE (bellwether_code));
+
+ /* Change the mode or code itself. */
+ group = iterator->group;
+ if (group->uses_iterator_p (x, iterator->index + group->num_builtins))
+ group->apply_iterator (x, value);
+
+ if (mode_maps)
+ apply_mode_maps (x, mode_maps, iterator, value, unknown_mode_attr);
+
+ /* Change each string and recursively change each rtx. */
+ format_ptr = GET_RTX_FORMAT (bellwether_code);
+ for (i = 0; format_ptr[i] != 0; i++)
+ switch (format_ptr[i])
+ {
+ case 'T':
+ XTMPL (x, i) = apply_iterator_to_string (XTMPL (x, i), iterator, value);
+ break;
+
+ case 'S':
+ case 's':
+ XSTR (x, i) = apply_iterator_to_string (XSTR (x, i), iterator, value);
break;
- if (c == ':' || c == ')' || c == ']' || c == '"' || c == '/'
- || c == '(' || c == '[')
- {
- ungetc (c, infile);
- break;
- }
- *p++ = c;
- c = getc (infile);
- }
- if (p == str)
- fatal_with_file_and_line (infile, "missing name or number");
- if (c == '\n')
- read_rtx_lineno++;
- *p = 0;
+ case 'e':
+ XEXP (x, i) = apply_iterator_to_rtx (XEXP (x, i), iterator, value,
+ mode_maps, unknown_mode_attr);
+ break;
- if (md_constants)
- {
- /* Do constant expansion. */
- struct md_constant *def;
+ case 'V':
+ case 'E':
+ if (XVEC (original, i))
+ {
+ XVEC (x, i) = rtvec_alloc (XVECLEN (original, i));
+ for (j = 0; j < XVECLEN (x, i); j++)
+ XVECEXP (x, i, j) = apply_iterator_to_rtx (XVECEXP (original, i, j),
+ iterator, value, mode_maps,
+ unknown_mode_attr);
+ }
+ break;
- p = str;
- do
- {
- struct md_constant tmp_def;
-
- tmp_def.name = p;
- def = htab_find (md_constants, &tmp_def);
- if (def)
- p = def->value;
- } while (def);
- if (p != str)
- strcpy (str, p);
- }
+ default:
+ break;
+ }
+ return x;
}
-/* Subroutine of the string readers. Handles backslash escapes.
- Caller has read the backslash, but not placed it into the obstack. */
-static void
-read_escape (ob, infile)
- struct obstack *ob;
- FILE *infile;
+/* Return true if X (or some subexpression of X) uses iterator ITERATOR. */
+
+static bool
+uses_iterator_p (rtx x, struct mapping *iterator)
{
- int c = getc (infile);
+ struct iterator_group *group;
+ const char *format_ptr;
+ int i, j;
+
+ if (x == 0)
+ return false;
+
+ group = iterator->group;
+ if (group->uses_iterator_p (x, iterator->index + group->num_builtins))
+ return true;
+
+ format_ptr = GET_RTX_FORMAT (BELLWETHER_CODE (GET_CODE (x)));
+ for (i = 0; format_ptr[i] != 0; i++)
+ switch (format_ptr[i])
+ {
+ case 'e':
+ if (uses_iterator_p (XEXP (x, i), iterator))
+ return true;
+ break;
- switch (c)
+ case 'V':
+ case 'E':
+ if (XVEC (x, i))
+ for (j = 0; j < XVECLEN (x, i); j++)
+ if (uses_iterator_p (XVECEXP (x, i, j), iterator))
+ return true;
+ break;
+
+ default:
+ break;
+ }
+ return false;
+}
+
+/* Return a condition that must satisfy both ORIGINAL and EXTRA. If ORIGINAL
+ has the form "&& ..." (as used in define_insn_and_splits), assume that
+ EXTRA is already satisfied. Empty strings are treated like "true". */
+
+static const char *
+add_condition_to_string (const char *original, const char *extra)
+{
+ if (original != 0 && original[0] == '&' && original[1] == '&')
+ return original;
+ return join_c_conditions (original, extra);
+}
+
+/* Like add_condition, but applied to all conditions in rtx X. */
+
+static void
+add_condition_to_rtx (rtx x, const char *extra)
+{
+ switch (GET_CODE (x))
{
- /* Backslash-newline is replaced by nothing, as in C. */
- case '\n':
- read_rtx_lineno++;
- return;
-
- /* \" \' \\ are replaced by the second character. */
- case '\\':
- case '"':
- case '\'':
+ case DEFINE_INSN:
+ case DEFINE_EXPAND:
+ XSTR (x, 2) = add_condition_to_string (XSTR (x, 2), extra);
break;
- /* Standard C string escapes:
- \a \b \f \n \r \t \v
- \[0-7] \x
- all are passed through to the output string unmolested.
- In normal use these wind up in a string constant processed
- by the C compiler, which will translate them appropriately.
- We do not bother checking that \[0-7] are followed by up to
- two octal digits, or that \x is followed by N hex digits.
- \? \u \U are left out because they are not in traditional C. */
- case 'a': case 'b': case 'f': case 'n': case 'r': case 't': case 'v':
- case '0': case '1': case '2': case '3': case '4': case '5': case '6':
- case '7': case 'x':
- obstack_1grow (ob, '\\');
+ case DEFINE_SPLIT:
+ case DEFINE_PEEPHOLE:
+ case DEFINE_PEEPHOLE2:
+ case DEFINE_COND_EXEC:
+ XSTR (x, 1) = add_condition_to_string (XSTR (x, 1), extra);
break;
- /* \; makes stuff for a C string constant containing
- newline and tab. */
- case ';':
- obstack_grow (ob, "\\n\\t", 4);
- return;
+ case DEFINE_INSN_AND_SPLIT:
+ XSTR (x, 2) = add_condition_to_string (XSTR (x, 2), extra);
+ XSTR (x, 4) = add_condition_to_string (XSTR (x, 4), extra);
+ break;
- /* pass anything else through, but issue a warning. */
default:
- fprintf (stderr, "%s:%d: warning: unrecognized escape \\%c\n",
- read_rtx_filename, read_rtx_lineno, c);
- obstack_1grow (ob, '\\');
break;
}
+}
+
+/* A htab_traverse callback. Search the EXPR_LIST given by DATA
+ for rtxes that use the iterator in *SLOT. Replace each such rtx
+ with a list of expansions. */
- obstack_1grow (ob, c);
+static int
+apply_iterator_traverse (void **slot, void *data)
+{
+ struct iterator_traverse_data *mtd = (struct iterator_traverse_data *) data;
+ struct mapping *iterator;
+ struct map_value *v;
+ rtx elem, new_elem, original, x;
+
+ iterator = (struct mapping *) *slot;
+ for (elem = mtd->queue; elem != 0; elem = XEXP (elem, 1))
+ if (uses_iterator_p (XEXP (elem, 0), iterator))
+ {
+ /* For each iterator we expand, we set UNKNOWN_MODE_ATTR to NULL.
+ If apply_iterator_rtx finds an unknown attribute for a mode,
+ it will set it to the attribute. We want to know whether
+ the attribute is unknown after we have expanded all
+ possible iterators, so setting it to NULL here gives us the
+ right result when the hash table traversal is complete. */
+ mtd->unknown_mode_attr = NULL;
+
+ original = XEXP (elem, 0);
+ for (v = iterator->values; v != 0; v = v->next)
+ {
+ x = apply_iterator_to_rtx (original, iterator, v->number,
+ mtd->mode_maps,
+ &mtd->unknown_mode_attr);
+ add_condition_to_rtx (x, v->string);
+ if (v != iterator->values)
+ {
+ /* Insert a new EXPR_LIST node after ELEM and put the
+ new expansion there. */
+ new_elem = rtx_alloc (EXPR_LIST);
+ XEXP (new_elem, 1) = XEXP (elem, 1);
+ XEXP (elem, 1) = new_elem;
+ elem = new_elem;
+ }
+ XEXP (elem, 0) = x;
+ }
+ }
+ return 1;
}
+/* Add a new "mapping" structure to hashtable TABLE. NAME is the name
+ of the mapping and GROUP is the group to which it belongs. */
-/* Read a double-quoted string onto the obstack. Caller has scanned
- the leading quote. */
-static char *
-read_quoted_string (ob, infile)
- struct obstack *ob;
- FILE *infile;
+static struct mapping *
+add_mapping (struct iterator_group *group, htab_t table, const char *name)
{
- int c;
+ struct mapping *m;
+ void **slot;
- while (1)
- {
- c = getc (infile); /* Read the string */
- if (c == '\n')
- read_rtx_lineno++;
- else if (c == '\\')
- {
- read_escape (ob, infile);
- continue;
- }
- else if (c == '"')
- break;
+ m = XNEW (struct mapping);
+ m->name = xstrdup (name);
+ m->group = group;
+ m->index = htab_elements (table);
+ m->values = 0;
- obstack_1grow (ob, c);
- }
+ slot = htab_find_slot (table, m, INSERT);
+ if (*slot != 0)
+ fatal_with_file_and_line ("`%s' already defined", name);
- obstack_1grow (ob, 0);
- return obstack_finish (ob);
+ *slot = m;
+ return m;
}
-/* Read a braced string (a la Tcl) onto the obstack. Caller has
- scanned the leading brace. Note that unlike quoted strings,
- the outermost braces _are_ included in the string constant. */
-static char *
-read_braced_string (ob, infile)
- struct obstack *ob;
- FILE *infile;
-{
- int c;
- int brace_depth = 1; /* caller-processed */
+/* Add the pair (NUMBER, STRING) to a list of map_value structures.
+ END_PTR points to the current null terminator for the list; return
+ a pointer the new null terminator. */
- obstack_1grow (ob, '{');
- while (brace_depth)
- {
- c = getc (infile); /* Read the string */
- if (c == '\n')
- read_rtx_lineno++;
- else if (c == '{')
- brace_depth++;
- else if (c == '}')
- brace_depth--;
- else if (c == '\\')
- {
- read_escape (ob, infile);
- continue;
- }
+static struct map_value **
+add_map_value (struct map_value **end_ptr, int number, const char *string)
+{
+ struct map_value *value;
- obstack_1grow (ob, c);
- }
+ value = XNEW (struct map_value);
+ value->next = 0;
+ value->number = number;
+ value->string = string;
- obstack_1grow (ob, 0);
- return obstack_finish (ob);
+ *end_ptr = value;
+ return &value->next;
}
-/* Read some kind of string constant. This is the high-level routine
- used by read_rtx. It handles surrounding parentheses, leading star,
- and dispatch to the appropriate string constant reader. */
+/* Do one-time initialization of the mode and code attributes. */
-static char *
-read_string (ob, infile, star_if_braced)
- struct obstack *ob;
- FILE *infile;
- int star_if_braced;
+static void
+initialize_iterators (void)
{
- char *stringbuf;
- int saw_paren = 0;
- int c;
-
- c = read_skip_spaces (infile);
- if (c == '(')
+ struct mapping *lower, *upper;
+ struct map_value **lower_ptr, **upper_ptr;
+ char *copy, *p;
+ int i;
+
+ modes.attrs = htab_create (13, leading_string_hash, leading_string_eq_p, 0);
+ modes.iterators = htab_create (13, leading_string_hash,
+ leading_string_eq_p, 0);
+ modes.num_builtins = MAX_MACHINE_MODE;
+ modes.find_builtin = find_mode;
+ modes.uses_iterator_p = uses_mode_iterator_p;
+ modes.apply_iterator = apply_mode_iterator;
+
+ codes.attrs = htab_create (13, leading_string_hash, leading_string_eq_p, 0);
+ codes.iterators = htab_create (13, leading_string_hash,
+ leading_string_eq_p, 0);
+ codes.num_builtins = NUM_RTX_CODE;
+ codes.find_builtin = find_code;
+ codes.uses_iterator_p = uses_code_iterator_p;
+ codes.apply_iterator = apply_code_iterator;
+
+ lower = add_mapping (&modes, modes.attrs, "mode");
+ upper = add_mapping (&modes, modes.attrs, "MODE");
+ lower_ptr = &lower->values;
+ upper_ptr = &upper->values;
+ for (i = 0; i < MAX_MACHINE_MODE; i++)
{
- saw_paren = 1;
- c = read_skip_spaces (infile);
- }
+ copy = xstrdup (GET_MODE_NAME (i));
+ for (p = copy; *p != 0; p++)
+ *p = TOLOWER (*p);
- if (c == '"')
- stringbuf = read_quoted_string (ob, infile);
- else if (c == '{')
- {
- if (star_if_braced)
- obstack_1grow (ob, '*');
- stringbuf = read_braced_string (ob, infile);
+ upper_ptr = add_map_value (upper_ptr, i, GET_MODE_NAME (i));
+ lower_ptr = add_map_value (lower_ptr, i, copy);
}
- else
- fatal_with_file_and_line (infile, "expected `\"' or `{', found `%c'", c);
- if (saw_paren)
+ lower = add_mapping (&codes, codes.attrs, "code");
+ upper = add_mapping (&codes, codes.attrs, "CODE");
+ lower_ptr = &lower->values;
+ upper_ptr = &upper->values;
+ for (i = 0; i < NUM_RTX_CODE; i++)
{
- c = read_skip_spaces (infile);
- if (c != ')')
- fatal_expected_char (infile, ')', c);
- }
+ copy = xstrdup (GET_RTX_NAME (i));
+ for (p = copy; *p != 0; p++)
+ *p = TOUPPER (*p);
- return stringbuf;
+ lower_ptr = add_map_value (lower_ptr, i, GET_RTX_NAME (i));
+ upper_ptr = add_map_value (upper_ptr, i, copy);
+ }
}
\f
/* Provide a version of a function to read a long long if the system does
not provide one. */
#if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_LONG && !defined(HAVE_ATOLL) && !defined(HAVE_ATOQ)
+HOST_WIDE_INT atoll (const char *);
+
HOST_WIDE_INT
-atoll (p)
- const char *p;
+atoll (const char *p)
{
int neg = 0;
HOST_WIDE_INT tmp_wide;
return tmp_wide;
}
#endif
-
-/* Given a constant definition, return a hash code for its name. */
-static unsigned
-def_hash (def)
- const void *def;
-{
- unsigned result, i;
- const char *string = ((const struct md_constant *) def)->name;
-
- for (result = i = 0;*string++ != '\0'; i++)
- result += ((unsigned char) *string << (i % CHAR_BIT));
- return result;
-}
-
-/* Given two constant definitions, return true if they have the same name. */
-static int
-def_name_eq_p (def1, def2)
- const void *def1, *def2;
-{
- return ! strcmp (((const struct md_constant *) def1)->name,
- ((const struct md_constant *) def2)->name);
-}
-
-/* INFILE is a FILE pointer to read text from. TMP_CHAR is a buffer suitable
- to read a name or number into. Process a define_constants directive,
- starting with the optional space after the "define_constants". */
+\f
+/* Process a define_conditions directive, starting with the optional
+ space after the "define_conditions". The directive looks like this:
+
+ (define_conditions [
+ (number "string")
+ (number "string")
+ ...
+ ])
+
+ It's not intended to appear in machine descriptions. It is
+ generated by (the program generated by) genconditions.c, and
+ slipped in at the beginning of the sequence of MD files read by
+ most of the other generators. */
static void
-read_constants (infile, tmp_char)
- FILE *infile;
- char *tmp_char;
+read_conditions (void)
{
int c;
- htab_t defs;
- c = read_skip_spaces (infile);
+ c = read_skip_spaces ();
if (c != '[')
- fatal_expected_char (infile, '[', c);
- defs = md_constants;
- if (! defs)
- defs = htab_create (32, def_hash, def_name_eq_p, (htab_del) 0);
- /* Disable constant expansion during definition processing. */
- md_constants = 0;
- while ( (c = read_skip_spaces (infile)) != ']')
+ fatal_expected_char ('[', c);
+
+ while ( (c = read_skip_spaces ()) != ']')
{
- struct md_constant *def;
- void **entry_ptr;
+ struct md_name name;
+ char *expr;
+ int value;
if (c != '(')
- fatal_expected_char (infile, '(', c);
- def = xmalloc (sizeof (struct md_constant));
- def->name = tmp_char;
- read_name (tmp_char, infile);
- entry_ptr = htab_find_slot (defs, def, TRUE);
- if (! *entry_ptr)
- def->name = xstrdup (tmp_char);
- c = read_skip_spaces (infile);
- ungetc (c, infile);
- read_name (tmp_char, infile);
- if (! *entry_ptr)
- {
- def->value = xstrdup (tmp_char);
- *entry_ptr = def;
- }
- else
- {
- def = *entry_ptr;
- if (strcmp (def->value, tmp_char))
- fatal_with_file_and_line (infile,
- "redefinition of %s, was %s, now %s",
- def->name, def->value, tmp_char);
- }
- c = read_skip_spaces (infile);
+ fatal_expected_char ('(', c);
+
+ read_name (&name);
+ validate_const_int (name.string);
+ value = atoi (name.string);
+
+ c = read_skip_spaces ();
+ if (c != '"')
+ fatal_expected_char ('"', c);
+ expr = read_quoted_string ();
+
+ c = read_skip_spaces ();
if (c != ')')
- fatal_expected_char (infile, ')', c);
- }
- md_constants = defs;
- c = read_skip_spaces (infile);
- if (c != ')')
- fatal_expected_char (infile, ')', c);
-}
+ fatal_expected_char (')', c);
-/* For every constant definition, call CALLBACK with two arguments:
- a pointer a pointer to the constant definition and INFO.
- Stops when CALLBACK returns zero. */
-void
-traverse_md_constants (callback, info)
- htab_trav callback;
- void *info;
-{
- if (md_constants)
- htab_traverse (md_constants, callback, info);
+ add_c_test (expr, value);
+ }
}
static void
-validate_const_int (infile, string)
- FILE *infile;
- const char *string;
+validate_const_int (const char *string)
{
const char *cp;
int valid = 1;
if (! ISDIGIT (*cp))
valid = 0;
if (!valid)
- fatal_with_file_and_line (infile, "invalid decimal constant \"%s\"\n", string);
+ fatal_with_file_and_line ("invalid decimal constant \"%s\"\n", string);
}
-/* 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. */
+/* Search GROUP for a mode or code called NAME and return its numerical
+ identifier. */
-rtx
-read_rtx (infile)
- FILE *infile;
+static int
+find_iterator (struct iterator_group *group, const char *name)
{
- int i, j;
- RTX_CODE tmp_code;
- const 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. */
- char tmp_char[256];
- rtx return_rtx;
- int c;
- int tmp_int;
- HOST_WIDE_INT tmp_wide;
+ struct mapping *m;
- /* Obstack used for allocating RTL objects. */
- static struct obstack rtl_obstack;
- static int initialized;
+ m = (struct mapping *) htab_find (group->iterators, &name);
+ if (m != 0)
+ return m->index + group->num_builtins;
+ return group->find_builtin (name);
+}
- /* Linked list structure for making RTXs: */
- struct rtx_list
- {
- struct rtx_list *next;
- rtx value; /* Value of this node. */
- };
+/* Finish reading a declaration of the form:
- if (!initialized) {
- obstack_init (&rtl_obstack);
- initialized = 1;
- }
+ (define... <name> [<value1> ... <valuen>])
-again:
- c = read_skip_spaces (infile); /* Should be open paren. */
- if (c != '(')
- fatal_expected_char (infile, '(', c);
+ from the MD file, where each <valuei> is either a bare symbol name or a
+ "(<name> <string>)" pair. The "(define..." part has already been read.
- read_name (tmp_char, infile);
+ Represent the declaration as a "mapping" structure; add it to TABLE
+ (which belongs to GROUP) and return it. */
+
+static struct mapping *
+read_mapping (struct iterator_group *group, htab_t table)
+{
+ struct md_name name;
+ struct mapping *m;
+ struct map_value **end_ptr;
+ const char *string;
+ int number, c;
- tmp_code = UNKNOWN;
+ /* Read the mapping name and create a structure for it. */
+ read_name (&name);
+ m = add_mapping (group, table, name.string);
- if (! strcmp (tmp_char, "define_constants"))
+ c = read_skip_spaces ();
+ if (c != '[')
+ fatal_expected_char ('[', c);
+
+ /* Read each value. */
+ end_ptr = &m->values;
+ c = read_skip_spaces ();
+ do
{
- read_constants (infile, tmp_char);
- goto again;
+ if (c != '(')
+ {
+ /* A bare symbol name that is implicitly paired to an
+ empty string. */
+ unread_char (c);
+ read_name (&name);
+ string = "";
+ }
+ else
+ {
+ /* A "(name string)" pair. */
+ read_name (&name);
+ string = read_string (false);
+ c = read_skip_spaces ();
+ if (c != ')')
+ fatal_expected_char (')', c);
+ }
+ number = group->find_builtin (name.string);
+ end_ptr = add_map_value (end_ptr, number, string);
+ c = read_skip_spaces ();
}
- for (i = 0; i < NUM_RTX_CODE; i++)
- if (! strcmp (tmp_char, GET_RTX_NAME (i)))
- {
- tmp_code = (RTX_CODE) i; /* get value for name */
- break;
- }
+ while (c != ']');
+
+ return m;
+}
+
+/* Check newly-created code iterator ITERATOR to see whether every code has the
+ same format. Initialize the iterator's entry in bellwether_codes. */
+
+static void
+check_code_iterator (struct mapping *iterator)
+{
+ struct map_value *v;
+ enum rtx_code bellwether;
+
+ bellwether = (enum rtx_code) iterator->values->number;
+ for (v = iterator->values->next; v != 0; v = v->next)
+ if (strcmp (GET_RTX_FORMAT (bellwether), GET_RTX_FORMAT (v->number)) != 0)
+ fatal_with_file_and_line ("code iterator `%s' combines "
+ "different rtx formats", iterator->name);
+
+ bellwether_codes = XRESIZEVEC (enum rtx_code, bellwether_codes,
+ iterator->index + 1);
+ bellwether_codes[iterator->index] = bellwether;
+}
- if (tmp_code == UNKNOWN)
- fatal_with_file_and_line (infile, "unknown rtx code `%s'", tmp_char);
+/* Read an rtx-related declaration from the MD file, given that it
+ starts with directive name RTX_NAME. Return true if it expands to
+ one or more rtxes (as defined by rtx.def). When returning true,
+ store the list of rtxes as an EXPR_LIST in *X. */
+
+bool
+read_rtx (const char *rtx_name, rtx *x)
+{
+ static rtx queue_head;
+ struct map_value *mode_maps;
+ struct iterator_traverse_data mtd;
- /* (NIL) stands for an expression that isn't there. */
- if (tmp_code == NIL)
+ /* Do one-time initialization. */
+ if (queue_head == 0)
{
- /* Discard the closeparen. */
- while ((c = getc (infile)) && c != ')')
- ;
+ initialize_iterators ();
+ queue_head = rtx_alloc (EXPR_LIST);
+ }
- return 0;
+ /* Handle various rtx-related declarations that aren't themselves
+ encoded as rtxes. */
+ if (strcmp (rtx_name, "define_conditions") == 0)
+ {
+ read_conditions ();
+ return false;
+ }
+ if (strcmp (rtx_name, "define_mode_attr") == 0)
+ {
+ read_mapping (&modes, modes.attrs);
+ return false;
}
+ if (strcmp (rtx_name, "define_mode_iterator") == 0)
+ {
+ read_mapping (&modes, modes.iterators);
+ return false;
+ }
+ if (strcmp (rtx_name, "define_code_attr") == 0)
+ {
+ read_mapping (&codes, codes.attrs);
+ return false;
+ }
+ if (strcmp (rtx_name, "define_code_iterator") == 0)
+ {
+ check_code_iterator (read_mapping (&codes, codes.iterators));
+ return false;
+ }
+
+ mode_maps = 0;
+ XEXP (queue_head, 0) = read_rtx_code (rtx_name, &mode_maps);
+ XEXP (queue_head, 1) = 0;
+
+ mtd.queue = queue_head;
+ mtd.mode_maps = mode_maps;
+ mtd.unknown_mode_attr = mode_maps ? mode_maps->string : NULL;
+ htab_traverse (modes.iterators, apply_iterator_traverse, &mtd);
+ htab_traverse (codes.iterators, apply_iterator_traverse, &mtd);
+ if (mtd.unknown_mode_attr)
+ fatal_with_file_and_line ("undefined attribute '%s' used for mode",
+ mtd.unknown_mode_attr);
+
+ *x = queue_head;
+ return true;
+}
+
+/* Subroutine of read_rtx and read_nested_rtx. CODE_NAME is the name of
+ either an rtx code or a code iterator. Parse the rest of the rtx and
+ return it. MODE_MAPS is as for iterator_traverse_data. */
+
+static rtx
+read_rtx_code (const char *code_name, struct map_value **mode_maps)
+{
+ int i;
+ RTX_CODE real_code, bellwether_code;
+ const char *format_ptr;
+ struct md_name name;
+ rtx return_rtx;
+ int c;
+ int tmp_int;
+ HOST_WIDE_INT tmp_wide;
+
+ /* Linked list structure for making RTXs: */
+ struct rtx_list
+ {
+ struct rtx_list *next;
+ rtx value; /* Value of this node. */
+ };
+
+ real_code = (enum rtx_code) find_iterator (&codes, code_name);
+ bellwether_code = BELLWETHER_CODE (real_code);
/* If we end up with an insn expression then we free this space below. */
- return_rtx = rtx_alloc (tmp_code);
- format_ptr = GET_RTX_FORMAT (GET_CODE (return_rtx));
+ return_rtx = rtx_alloc (bellwether_code);
+ format_ptr = GET_RTX_FORMAT (bellwether_code);
+ PUT_CODE (return_rtx, real_code);
/* If what follows is `: mode ', read it and
store the mode in the rtx. */
- i = read_skip_spaces (infile);
+ i = read_skip_spaces ();
if (i == ':')
{
- read_name (tmp_char, infile);
- for (j = 0; j < NUM_MACHINE_MODES; j++)
- if (! strcmp (GET_MODE_NAME (j), tmp_char))
- break;
+ unsigned int mode;
- if (j == MAX_MACHINE_MODE)
- fatal_with_file_and_line (infile, "unknown mode `%s'", tmp_char);
-
- PUT_MODE (return_rtx, (enum machine_mode) j);
+ read_name (&name);
+ if (name.string[0] != '<' || name.string[strlen (name.string) - 1] != '>')
+ mode = find_iterator (&modes, name.string);
+ else
+ mode = mode_attr_index (mode_maps, name.string);
+ PUT_MODE (return_rtx, (enum machine_mode) mode);
+ if (GET_MODE (return_rtx) != mode)
+ fatal_with_file_and_line ("mode too large");
}
else
- ungetc (i, infile);
+ unread_char (i);
- for (i = 0; i < GET_RTX_LENGTH (GET_CODE (return_rtx)); i++)
- switch (*format_ptr++)
+ for (i = 0; format_ptr[i] != 0; i++)
+ switch (format_ptr[i])
{
/* 0 means a field for internal use only.
Don't expect it to be present in the input. */
case 'e':
case 'u':
- XEXP (return_rtx, i) = read_rtx (infile);
+ XEXP (return_rtx, i) = read_nested_rtx (mode_maps);
break;
case 'V':
/* 'V' is an optional vector: if a closeparen follows,
just store NULL for this element. */
- c = read_skip_spaces (infile);
- ungetc (c, infile);
+ c = read_skip_spaces ();
+ unread_char (c);
if (c == ')')
{
XVEC (return_rtx, i) = 0;
int list_counter = 0;
rtvec return_vec = NULL_RTVEC;
- c = read_skip_spaces (infile);
+ c = read_skip_spaces ();
if (c != '[')
- fatal_expected_char (infile, '[', c);
+ fatal_expected_char ('[', c);
- /* add expressions to a list, while keeping a count */
+ /* Add expressions to a list, while keeping a count. */
obstack_init (&vector_stack);
- while ((c = read_skip_spaces (infile)) && c != ']')
+ while ((c = read_skip_spaces ()) && c != ']')
{
- ungetc (c, infile);
+ if (c == EOF)
+ fatal_expected_char (']', c);
+ unread_char (c);
list_counter++;
- obstack_ptr_grow (&vector_stack, (PTR) read_rtx (infile));
+ obstack_ptr_grow (&vector_stack, read_nested_rtx (mode_maps));
}
if (list_counter > 0)
{
memcpy (&return_vec->elem[0], obstack_finish (&vector_stack),
list_counter * sizeof (rtx));
}
+ else if (format_ptr[i] == 'E')
+ fatal_with_file_and_line ("vector must have at least one element");
XVEC (return_rtx, i) = return_vec;
obstack_free (&vector_stack, NULL);
/* close bracket gotten */
break;
case 'S':
- /* 'S' is an optional string: if a closeparen follows,
- just store NULL for this element. */
- c = read_skip_spaces (infile);
- ungetc (c, infile);
- if (c == ')')
- {
- XSTR (return_rtx, i) = 0;
- break;
- }
-
case 'T':
case 's':
{
char *stringbuf;
+ int star_if_braced;
+
+ c = read_skip_spaces ();
+ unread_char (c);
+ if (c == ')')
+ {
+ /* 'S' fields are optional and should be NULL if no string
+ was given. Also allow normal 's' and 'T' strings to be
+ omitted, treating them in the same way as empty strings. */
+ XSTR (return_rtx, i) = (format_ptr[i] == 'S' ? NULL : "");
+ break;
+ }
/* The output template slot of a DEFINE_INSN,
DEFINE_INSN_AND_SPLIT, or DEFINE_PEEPHOLE automatically
gets a star inserted as its first character, if it is
written with a brace block instead of a string constant. */
- int star_if_braced = (format_ptr[-1] == 'T');
+ star_if_braced = (format_ptr[i] == 'T');
- stringbuf = read_string (&rtl_obstack, infile, star_if_braced);
+ stringbuf = read_string (star_if_braced);
/* For insn patterns, we want to provide a default name
based on the file and line, like "*foo.md:12", if the
|| GET_CODE (return_rtx) == DEFINE_INSN_AND_SPLIT))
{
char line_name[20];
- const char *fn = (read_rtx_filename ? read_rtx_filename : "rtx");
+ const char *fn = (read_md_filename ? read_md_filename : "rtx");
const char *slash;
for (slash = fn; *slash; slash ++)
if (*slash == '/' || *slash == '\\' || *slash == ':')
fn = slash + 1;
- obstack_1grow (&rtl_obstack, '*');
- obstack_grow (&rtl_obstack, fn, strlen (fn));
- sprintf (line_name, ":%d", read_rtx_lineno);
- obstack_grow (&rtl_obstack, line_name, strlen (line_name)+1);
- stringbuf = (char *) obstack_finish (&rtl_obstack);
+ obstack_1grow (&string_obstack, '*');
+ obstack_grow (&string_obstack, fn, strlen (fn));
+ sprintf (line_name, ":%d", read_md_lineno);
+ obstack_grow (&string_obstack, line_name, strlen (line_name)+1);
+ stringbuf = XOBFINISH (&string_obstack, char *);
}
if (star_if_braced)
break;
case 'w':
- read_name (tmp_char, infile);
- validate_const_int (infile, tmp_char);
+ read_name (&name);
+ validate_const_int (name.string);
#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
- tmp_wide = atoi (tmp_char);
+ tmp_wide = atoi (name.string);
#else
#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
- tmp_wide = atol (tmp_char);
+ tmp_wide = atol (name.string);
#else
/* Prefer atoll over atoq, since the former is in the ISO C99 standard.
But prefer not to use our hand-rolled function above either. */
#if defined(HAVE_ATOLL) || !defined(HAVE_ATOQ)
- tmp_wide = atoll (tmp_char);
+ tmp_wide = atoll (name.string);
#else
- tmp_wide = atoq (tmp_char);
+ tmp_wide = atoq (name.string);
#endif
#endif
#endif
case 'i':
case 'n':
- read_name (tmp_char, infile);
- validate_const_int (infile, tmp_char);
- tmp_int = atoi (tmp_char);
+ read_name (&name);
+ validate_const_int (name.string);
+ tmp_int = atoi (name.string);
XINT (return_rtx, i) = tmp_int;
break;
default:
- fprintf (stderr,
- "switch format wrong in rtl.read_rtx(). format was: %c.\n",
- format_ptr[-1]);
- fprintf (stderr, "\tfile position: %ld\n", ftell (infile));
- abort ();
+ gcc_unreachable ();
}
- c = read_skip_spaces (infile);
+ c = read_skip_spaces ();
+ /* Syntactic sugar for AND and IOR, allowing Lisp-like
+ arbitrary number of arguments for them. */
+ if (c == '('
+ && (GET_CODE (return_rtx) == AND
+ || GET_CODE (return_rtx) == IOR))
+ return read_rtx_variadic (mode_maps, return_rtx);
+
+ unread_char (c);
+ return return_rtx;
+}
+
+/* Read a nested rtx construct from the MD file and return it.
+ MODE_MAPS is as for iterator_traverse_data. */
+
+static rtx
+read_nested_rtx (struct map_value **mode_maps)
+{
+ struct md_name name;
+ int c;
+ rtx return_rtx;
+
+ c = read_skip_spaces ();
+ if (c != '(')
+ fatal_expected_char ('(', c);
+
+ read_name (&name);
+ if (strcmp (name.string, "nil") == 0)
+ return_rtx = NULL;
+ else
+ return_rtx = read_rtx_code (name.string, mode_maps);
+
+ c = read_skip_spaces ();
if (c != ')')
- fatal_expected_char (infile, ')', c);
+ fatal_expected_char (')', c);
return return_rtx;
}
+
+/* Mutually recursive subroutine of read_rtx which reads
+ (thing x1 x2 x3 ...) and produces RTL as if
+ (thing x1 (thing x2 (thing x3 ...))) had been written.
+ When called, FORM is (thing x1 x2), and the file position
+ is just past the leading parenthesis of x3. Only works
+ for THINGs which are dyadic expressions, e.g. AND, IOR. */
+static rtx
+read_rtx_variadic (struct map_value **mode_maps, rtx form)
+{
+ char c = '(';
+ rtx p = form, q;
+
+ do
+ {
+ unread_char (c);
+
+ q = rtx_alloc (GET_CODE (p));
+ PUT_MODE (q, GET_MODE (p));
+
+ XEXP (q, 0) = XEXP (p, 1);
+ XEXP (q, 1) = read_nested_rtx (mode_maps);
+
+ XEXP (p, 1) = q;
+ p = q;
+ c = read_skip_spaces ();
+ }
+ while (c == '(');
+ unread_char (c);
+ return form;
+}
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