/* Generate code from to output assembler insns as recognized from rtl.
Copyright (C) 1987-2015 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 3, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
. */
/* This program reads the machine description for the compiler target machine
and produces a file containing these things:
1. An array of `struct insn_data_d', which is indexed by insn code number,
which contains:
a. `name' is the name for that pattern. Nameless patterns are
given a name.
b. `output' hold either the output template, an array of output
templates, or an output function.
c. `genfun' is the function to generate a body for that pattern,
given operands as arguments.
d. `n_operands' is the number of distinct operands in the pattern
for that insn,
e. `n_dups' is the number of match_dup's that appear in the insn's
pattern. This says how many elements of `recog_data.dup_loc' are
significant after an insn has been recognized.
f. `n_alternatives' is the number of alternatives in the constraints
of each pattern.
g. `output_format' tells what type of thing `output' is.
h. `operand' is the base of an array of operand data for the insn.
2. An array of `struct insn_operand data', used by `operand' above.
a. `predicate', an int-valued function, is the match_operand predicate
for this operand.
b. `constraint' is the constraint for this operand.
c. `address_p' indicates that the operand appears within ADDRESS
rtx's.
d. `mode' is the machine mode that that operand is supposed to have.
e. `strict_low', is nonzero for operands contained in a STRICT_LOW_PART.
f. `eliminable', is nonzero for operands that are matched normally by
MATCH_OPERAND; it is zero for operands that should not be changed during
register elimination such as MATCH_OPERATORs.
g. `allows_mem', is true for operands that accept MEM rtxes.
The code number of an insn is simply its position in the machine
description; code numbers are assigned sequentially to entries in
the description, starting with code number 0.
Thus, the following entry in the machine description
(define_insn "clrdf"
[(set (match_operand:DF 0 "general_operand" "")
(const_int 0))]
""
"clrd %0")
assuming it is the 25th entry present, would cause
insn_data[24].template to be "clrd %0", and
insn_data[24].n_operands to be 1. */
#include "bconfig.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "errors.h"
#include "read-md.h"
#include "gensupport.h"
/* No instruction can have more operands than this. Sorry for this
arbitrary limit, but what machine will have an instruction with
this many operands? */
#define MAX_MAX_OPERANDS 40
static char general_mem[] = { TARGET_MEM_CONSTRAINT, 0 };
static int n_occurrences (int, const char *);
static const char *strip_whitespace (const char *);
/* insns in the machine description are assigned sequential code numbers
that are used by insn-recog.c (produced by genrecog) to communicate
to insn-output.c (produced by this program). */
static int next_code_number;
/* This counts all definitions in the md file,
for the sake of error messages. */
static int next_index_number;
/* This counts all operands used in the md file. The first is null. */
static int next_operand_number = 1;
/* Record in this chain all information about the operands we will output. */
struct operand_data
{
struct operand_data *next;
int index;
const char *predicate;
const char *constraint;
machine_mode mode;
unsigned char n_alternatives;
char address_p;
char strict_low;
char eliminable;
char seen;
};
/* Begin with a null operand at index 0. */
static struct operand_data null_operand =
{
0, 0, "", "", VOIDmode, 0, 0, 0, 0, 0
};
static struct operand_data *odata = &null_operand;
static struct operand_data **odata_end = &null_operand.next;
/* Must match the constants in recog.h. */
#define INSN_OUTPUT_FORMAT_NONE 0 /* abort */
#define INSN_OUTPUT_FORMAT_SINGLE 1 /* const char * */
#define INSN_OUTPUT_FORMAT_MULTI 2 /* const char * const * */
#define INSN_OUTPUT_FORMAT_FUNCTION 3 /* const char * (*)(...) */
/* Record in this chain all information that we will output,
associated with the code number of the insn. */
struct data
{
struct data *next;
const char *name;
const char *template_code;
int code_number;
int index_number;
const char *filename;
int lineno;
int n_generator_args; /* Number of arguments passed to generator */
int n_operands; /* Number of operands this insn recognizes */
int n_dups; /* Number times match_dup appears in pattern */
int n_alternatives; /* Number of alternatives in each constraint */
int operand_number; /* Operand index in the big array. */
int output_format; /* INSN_OUTPUT_FORMAT_*. */
struct operand_data operand[MAX_MAX_OPERANDS];
};
/* A dummy insn, for CODE_FOR_nothing. */
static struct data nothing;
/* This variable points to the first link in the insn chain. */
static struct data *idata = ¬hing;
/* This variable points to the end of the insn chain. This is where
everything relevant from the machien description is appended to. */
static struct data **idata_end = ¬hing.next;
static void output_prologue (void);
static void output_operand_data (void);
static void output_insn_data (void);
static void output_get_insn_name (void);
static void scan_operands (struct data *, rtx, int, int);
static int compare_operands (struct operand_data *,
struct operand_data *);
static void place_operands (struct data *);
static void process_template (struct data *, const char *);
static void validate_insn_alternatives (struct data *);
static void validate_insn_operands (struct data *);
static void gen_insn (rtx, int);
static void gen_peephole (rtx, int);
static void gen_expand (rtx, int);
static void gen_split (rtx, int);
struct constraint_data
{
struct constraint_data *next_this_letter;
int lineno;
unsigned int namelen;
const char name[1];
};
/* All machine-independent constraint characters (except digits) that
are handled outside the define*_constraint mechanism. */
static const char indep_constraints[] = ",=+%*?!^$#&g";
static struct constraint_data *
constraints_by_letter_table[1 << CHAR_BIT];
static int mdep_constraint_len (const char *, int, int);
static void note_constraint (rtx, int);
static void
output_prologue (void)
{
printf ("/* Generated automatically by the program `genoutput'\n\
from the machine description file `md'. */\n\n");
printf ("#include \"config.h\"\n");
printf ("#include \"system.h\"\n");
printf ("#include \"coretypes.h\"\n");
printf ("#include \"backend.h\"\n");
printf ("#include \"predict.h\"\n");
printf ("#include \"tree.h\"\n");
printf ("#include \"rtl.h\"\n");
printf ("#include \"flags.h\"\n");
printf ("#include \"alias.h\"\n");
printf ("#include \"varasm.h\"\n");
printf ("#include \"stor-layout.h\"\n");
printf ("#include \"calls.h\"\n");
printf ("#include \"insn-config.h\"\n");
printf ("#include \"expmed.h\"\n");
printf ("#include \"dojump.h\"\n");
printf ("#include \"explow.h\"\n");
printf ("#include \"emit-rtl.h\"\n");
printf ("#include \"stmt.h\"\n");
printf ("#include \"expr.h\"\n");
printf ("#include \"insn-codes.h\"\n");
printf ("#include \"tm_p.h\"\n");
printf ("#include \"regs.h\"\n");
printf ("#include \"conditions.h\"\n");
printf ("#include \"insn-attr.h\"\n\n");
printf ("#include \"recog.h\"\n\n");
printf ("#include \"diagnostic-core.h\"\n");
printf ("#include \"output.h\"\n");
printf ("#include \"target.h\"\n");
printf ("#include \"tm-constrs.h\"\n");
}
static void
output_operand_data (void)
{
struct operand_data *d;
printf ("\nstatic const struct insn_operand_data operand_data[] = \n{\n");
for (d = odata; d; d = d->next)
{
struct pred_data *pred;
printf (" {\n");
printf (" %s,\n",
d->predicate && d->predicate[0] ? d->predicate : "0");
printf (" \"%s\",\n", d->constraint ? d->constraint : "");
printf (" %smode,\n", GET_MODE_NAME (d->mode));
printf (" %d,\n", d->strict_low);
printf (" %d,\n", d->constraint == NULL ? 1 : 0);
printf (" %d,\n", d->eliminable);
pred = NULL;
if (d->predicate)
pred = lookup_predicate (d->predicate);
printf (" %d\n", pred && pred->codes[MEM]);
printf (" },\n");
}
printf ("};\n\n\n");
}
static void
output_insn_data (void)
{
struct data *d;
int name_offset = 0;
int next_name_offset;
const char * last_name = 0;
const char * next_name = 0;
struct data *n;
for (n = idata, next_name_offset = 1; n; n = n->next, next_name_offset++)
if (n->name)
{
next_name = n->name;
break;
}
printf ("#if GCC_VERSION >= 2007\n__extension__\n#endif\n");
printf ("\nconst struct insn_data_d insn_data[] = \n{\n");
for (d = idata; d; d = d->next)
{
printf (" /* %s:%d */\n", d->filename, d->lineno);
printf (" {\n");
if (d->name)
{
printf (" \"%s\",\n", d->name);
name_offset = 0;
last_name = d->name;
next_name = 0;
for (n = d->next, next_name_offset = 1; n;
n = n->next, next_name_offset++)
{
if (n->name)
{
next_name = n->name;
break;
}
}
}
else
{
name_offset++;
if (next_name && (last_name == 0
|| name_offset > next_name_offset / 2))
printf (" \"%s-%d\",\n", next_name,
next_name_offset - name_offset);
else
printf (" \"%s+%d\",\n", last_name, name_offset);
}
switch (d->output_format)
{
case INSN_OUTPUT_FORMAT_NONE:
printf ("#if HAVE_DESIGNATED_UNION_INITIALIZERS\n");
printf (" { 0 },\n");
printf ("#else\n");
printf (" { 0, 0, 0 },\n");
printf ("#endif\n");
break;
case INSN_OUTPUT_FORMAT_SINGLE:
{
const char *p = d->template_code;
char prev = 0;
printf ("#if HAVE_DESIGNATED_UNION_INITIALIZERS\n");
printf (" { .single =\n");
printf ("#else\n");
printf (" {\n");
printf ("#endif\n");
printf (" \"");
while (*p)
{
if (IS_VSPACE (*p) && prev != '\\')
{
/* Preserve two consecutive \n's or \r's, but treat \r\n
as a single newline. */
if (*p == '\n' && prev != '\r')
printf ("\\n\\\n");
}
else
putchar (*p);
prev = *p;
++p;
}
printf ("\",\n");
printf ("#if HAVE_DESIGNATED_UNION_INITIALIZERS\n");
printf (" },\n");
printf ("#else\n");
printf (" 0, 0 },\n");
printf ("#endif\n");
}
break;
case INSN_OUTPUT_FORMAT_MULTI:
printf ("#if HAVE_DESIGNATED_UNION_INITIALIZERS\n");
printf (" { .multi = output_%d },\n", d->code_number);
printf ("#else\n");
printf (" { 0, output_%d, 0 },\n", d->code_number);
printf ("#endif\n");
break;
case INSN_OUTPUT_FORMAT_FUNCTION:
printf ("#if HAVE_DESIGNATED_UNION_INITIALIZERS\n");
printf (" { .function = output_%d },\n", d->code_number);
printf ("#else\n");
printf (" { 0, 0, output_%d },\n", d->code_number);
printf ("#endif\n");
break;
default:
gcc_unreachable ();
}
if (d->name && d->name[0] != '*')
printf (" { (insn_gen_fn::stored_funcptr) gen_%s },\n", d->name);
else
printf (" { 0 },\n");
printf (" &operand_data[%d],\n", d->operand_number);
printf (" %d,\n", d->n_generator_args);
printf (" %d,\n", d->n_operands);
printf (" %d,\n", d->n_dups);
printf (" %d,\n", d->n_alternatives);
printf (" %d\n", d->output_format);
printf (" },\n");
}
printf ("};\n\n\n");
}
static void
output_get_insn_name (void)
{
printf ("const char *\n");
printf ("get_insn_name (int code)\n");
printf ("{\n");
printf (" if (code == NOOP_MOVE_INSN_CODE)\n");
printf (" return \"NOOP_MOVE\";\n");
printf (" else\n");
printf (" return insn_data[code].name;\n");
printf ("}\n");
}
/* Stores the operand data into `d->operand[i]'.
THIS_ADDRESS_P is nonzero if the containing rtx was an ADDRESS.
THIS_STRICT_LOW is nonzero if the containing rtx was a STRICT_LOW_PART. */
static void
scan_operands (struct data *d, rtx part, int this_address_p,
int this_strict_low)
{
int i, j;
const char *format_ptr;
int opno;
if (part == 0)
return;
switch (GET_CODE (part))
{
case MATCH_OPERAND:
opno = XINT (part, 0);
if (opno >= MAX_MAX_OPERANDS)
{
error_with_line (d->lineno, "maximum number of operands exceeded");
return;
}
if (d->operand[opno].seen)
error_with_line (d->lineno, "repeated operand number %d\n", opno);
d->operand[opno].seen = 1;
d->operand[opno].mode = GET_MODE (part);
d->operand[opno].strict_low = this_strict_low;
d->operand[opno].predicate = XSTR (part, 1);
d->operand[opno].constraint = strip_whitespace (XSTR (part, 2));
d->operand[opno].n_alternatives
= n_occurrences (',', d->operand[opno].constraint) + 1;
d->operand[opno].address_p = this_address_p;
d->operand[opno].eliminable = 1;
return;
case MATCH_SCRATCH:
opno = XINT (part, 0);
if (opno >= MAX_MAX_OPERANDS)
{
error_with_line (d->lineno, "maximum number of operands exceeded");
return;
}
if (d->operand[opno].seen)
error_with_line (d->lineno, "repeated operand number %d\n", opno);
d->operand[opno].seen = 1;
d->operand[opno].mode = GET_MODE (part);
d->operand[opno].strict_low = 0;
d->operand[opno].predicate = "scratch_operand";
d->operand[opno].constraint = strip_whitespace (XSTR (part, 1));
d->operand[opno].n_alternatives
= n_occurrences (',', d->operand[opno].constraint) + 1;
d->operand[opno].address_p = 0;
d->operand[opno].eliminable = 0;
return;
case MATCH_OPERATOR:
case MATCH_PARALLEL:
opno = XINT (part, 0);
if (opno >= MAX_MAX_OPERANDS)
{
error_with_line (d->lineno, "maximum number of operands exceeded");
return;
}
if (d->operand[opno].seen)
error_with_line (d->lineno, "repeated operand number %d\n", opno);
d->operand[opno].seen = 1;
d->operand[opno].mode = GET_MODE (part);
d->operand[opno].strict_low = 0;
d->operand[opno].predicate = XSTR (part, 1);
d->operand[opno].constraint = 0;
d->operand[opno].address_p = 0;
d->operand[opno].eliminable = 0;
for (i = 0; i < XVECLEN (part, 2); i++)
scan_operands (d, XVECEXP (part, 2, i), 0, 0);
return;
case STRICT_LOW_PART:
scan_operands (d, XEXP (part, 0), 0, 1);
return;
default:
break;
}
format_ptr = GET_RTX_FORMAT (GET_CODE (part));
for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
switch (*format_ptr++)
{
case 'e':
case 'u':
scan_operands (d, XEXP (part, i), 0, 0);
break;
case 'E':
if (XVEC (part, i) != NULL)
for (j = 0; j < XVECLEN (part, i); j++)
scan_operands (d, XVECEXP (part, i, j), 0, 0);
break;
}
}
/* Compare two operands for content equality. */
static int
compare_operands (struct operand_data *d0, struct operand_data *d1)
{
const char *p0, *p1;
p0 = d0->predicate;
if (!p0)
p0 = "";
p1 = d1->predicate;
if (!p1)
p1 = "";
if (strcmp (p0, p1) != 0)
return 0;
p0 = d0->constraint;
if (!p0)
p0 = "";
p1 = d1->constraint;
if (!p1)
p1 = "";
if (strcmp (p0, p1) != 0)
return 0;
if (d0->mode != d1->mode)
return 0;
if (d0->strict_low != d1->strict_low)
return 0;
if (d0->eliminable != d1->eliminable)
return 0;
return 1;
}
/* Scan the list of operands we've already committed to output and either
find a subsequence that is the same, or allocate a new one at the end. */
static void
place_operands (struct data *d)
{
struct operand_data *od, *od2;
int i;
if (d->n_operands == 0)
{
d->operand_number = 0;
return;
}
/* Brute force substring search. */
for (od = odata, i = 0; od; od = od->next, i = 0)
if (compare_operands (od, &d->operand[0]))
{
od2 = od->next;
i = 1;
while (1)
{
if (i == d->n_operands)
goto full_match;
if (od2 == NULL)
goto partial_match;
if (! compare_operands (od2, &d->operand[i]))
break;
++i, od2 = od2->next;
}
}
/* Either partial match at the end of the list, or no match. In either
case, we tack on what operands are remaining to the end of the list. */
partial_match:
d->operand_number = next_operand_number - i;
for (; i < d->n_operands; ++i)
{
od2 = &d->operand[i];
*odata_end = od2;
odata_end = &od2->next;
od2->index = next_operand_number++;
}
*odata_end = NULL;
return;
full_match:
d->operand_number = od->index;
return;
}
/* Process an assembler template from a define_insn or a define_peephole.
It is either the assembler code template, a list of assembler code
templates, or C code to generate the assembler code template. */
static void
process_template (struct data *d, const char *template_code)
{
const char *cp;
int i;
/* Templates starting with * contain straight code to be run. */
if (template_code[0] == '*')
{
d->template_code = 0;
d->output_format = INSN_OUTPUT_FORMAT_FUNCTION;
puts ("\nstatic const char *");
printf ("output_%d (rtx *operands ATTRIBUTE_UNUSED, rtx_insn *insn ATTRIBUTE_UNUSED)\n",
d->code_number);
puts ("{");
print_md_ptr_loc (template_code);
puts (template_code + 1);
puts ("}");
}
/* If the assembler code template starts with a @ it is a newline-separated
list of assembler code templates, one for each alternative. */
else if (template_code[0] == '@')
{
int found_star = 0;
for (cp = &template_code[1]; *cp; )
{
while (ISSPACE (*cp))
cp++;
if (*cp == '*')
found_star = 1;
while (!IS_VSPACE (*cp) && *cp != '\0')
++cp;
}
d->template_code = 0;
if (found_star)
{
d->output_format = INSN_OUTPUT_FORMAT_FUNCTION;
puts ("\nstatic const char *");
printf ("output_%d (rtx *operands ATTRIBUTE_UNUSED, "
"rtx_insn *insn ATTRIBUTE_UNUSED)\n", d->code_number);
puts ("{");
puts (" switch (which_alternative)\n {");
}
else
{
d->output_format = INSN_OUTPUT_FORMAT_MULTI;
printf ("\nstatic const char * const output_%d[] = {\n",
d->code_number);
}
for (i = 0, cp = &template_code[1]; *cp; )
{
const char *ep, *sp, *bp;
while (ISSPACE (*cp))
cp++;
bp = cp;
if (found_star)
{
printf (" case %d:", i);
if (*cp == '*')
{
printf ("\n ");
cp++;
}
else
printf (" return \"");
}
else
printf (" \"");
for (ep = sp = cp; !IS_VSPACE (*ep) && *ep != '\0'; ++ep)
if (!ISSPACE (*ep))
sp = ep + 1;
if (sp != ep)
message_with_line (d->lineno,
"trailing whitespace in output template");
while (cp < sp)
{
putchar (*cp);
cp++;
}
if (!found_star)
puts ("\",");
else if (*bp != '*')
puts ("\";");
else
{
/* The usual action will end with a return.
If there is neither break or return at the end, this is
assumed to be intentional; this allows to have multiple
consecutive alternatives share some code. */
puts ("");
}
i++;
}
if (i == 1)
message_with_line (d->lineno,
"'@' is redundant for output template with single alternative");
if (i != d->n_alternatives)
error_with_line (d->lineno,
"wrong number of alternatives in the output template");
if (found_star)
puts (" default: gcc_unreachable ();\n }\n}");
else
printf ("};\n");
}
else
{
d->template_code = template_code;
d->output_format = INSN_OUTPUT_FORMAT_SINGLE;
}
}
/* Check insn D for consistency in number of constraint alternatives. */
static void
validate_insn_alternatives (struct data *d)
{
int n = 0, start;
/* Make sure all the operands have the same number of alternatives
in their constraints. Let N be that number. */
for (start = 0; start < d->n_operands; start++)
if (d->operand[start].n_alternatives > 0)
{
int len, i;
const char *p;
char c;
int which_alternative = 0;
int alternative_count_unsure = 0;
bool seen_write = false;
for (p = d->operand[start].constraint; (c = *p); p += len)
{
if ((c == '%' || c == '=' || c == '+')
&& p != d->operand[start].constraint)
error_with_line (d->lineno,
"character '%c' can only be used at the"
" beginning of a constraint string", c);
if (c == '=' || c == '+')
seen_write = true;
/* Earlyclobber operands must always be marked write-only
or read/write. */
if (!seen_write && c == '&')
error_with_line (d->lineno,
"earlyclobber operands may not be"
" read-only in alternative %d",
which_alternative);
if (ISSPACE (c) || strchr (indep_constraints, c))
len = 1;
else if (ISDIGIT (c))
{
const char *q = p;
do
q++;
while (ISDIGIT (*q));
len = q - p;
}
else
len = mdep_constraint_len (p, d->lineno, start);
if (c == ',')
{
which_alternative++;
continue;
}
for (i = 1; i < len; i++)
if (p[i] == '\0')
{
error_with_line (d->lineno,
"NUL in alternative %d of operand %d",
which_alternative, start);
alternative_count_unsure = 1;
break;
}
else if (strchr (",#*", p[i]))
{
error_with_line (d->lineno,
"'%c' in alternative %d of operand %d",
p[i], which_alternative, start);
alternative_count_unsure = 1;
}
}
if (!alternative_count_unsure)
{
if (n == 0)
n = d->operand[start].n_alternatives;
else if (n != d->operand[start].n_alternatives)
error_with_line (d->lineno,
"wrong number of alternatives in operand %d",
start);
}
}
/* Record the insn's overall number of alternatives. */
d->n_alternatives = n;
}
/* Verify that there are no gaps in operand numbers for INSNs. */
static void
validate_insn_operands (struct data *d)
{
int i;
for (i = 0; i < d->n_operands; ++i)
if (d->operand[i].seen == 0)
error_with_line (d->lineno, "missing operand %d", i);
}
static void
validate_optab_operands (struct data *d)
{
if (!d->name || d->name[0] == '\0' || d->name[0] == '*')
return;
/* Miscellaneous tests. */
if (strncmp (d->name, "cstore", 6) == 0
&& d->name[strlen (d->name) - 1] == '4'
&& d->operand[0].mode == VOIDmode)
{
message_with_line (d->lineno, "missing mode for operand 0 of cstore");
have_error = 1;
}
}
/* Look at a define_insn just read. Assign its code number. Record
on idata the template and the number of arguments. If the insn has
a hairy output action, output a function for now. */
static void
gen_insn (rtx insn, int lineno)
{
struct pattern_stats stats;
struct data *d = XNEW (struct data);
int i;
d->code_number = next_code_number;
d->index_number = next_index_number;
d->filename = read_md_filename;
d->lineno = lineno;
if (XSTR (insn, 0)[0])
d->name = XSTR (insn, 0);
else
d->name = 0;
/* Build up the list in the same order as the insns are seen
in the machine description. */
d->next = 0;
*idata_end = d;
idata_end = &d->next;
memset (d->operand, 0, sizeof (d->operand));
for (i = 0; i < XVECLEN (insn, 1); i++)
scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
get_pattern_stats (&stats, XVEC (insn, 1));
d->n_generator_args = stats.num_generator_args;
d->n_operands = stats.num_insn_operands;
d->n_dups = stats.num_dups;
validate_insn_operands (d);
validate_insn_alternatives (d);
validate_optab_operands (d);
place_operands (d);
process_template (d, XTMPL (insn, 3));
}
/* Look at a define_peephole just read. Assign its code number.
Record on idata the template and the number of arguments.
If the insn has a hairy output action, output it now. */
static void
gen_peephole (rtx peep, int lineno)
{
struct pattern_stats stats;
struct data *d = XNEW (struct data);
int i;
d->code_number = next_code_number;
d->index_number = next_index_number;
d->filename = read_md_filename;
d->lineno = lineno;
d->name = 0;
/* Build up the list in the same order as the insns are seen
in the machine description. */
d->next = 0;
*idata_end = d;
idata_end = &d->next;
memset (d->operand, 0, sizeof (d->operand));
/* Get the number of operands by scanning all the patterns of the
peephole optimizer. But ignore all the rest of the information
thus obtained. */
for (i = 0; i < XVECLEN (peep, 0); i++)
scan_operands (d, XVECEXP (peep, 0, i), 0, 0);
get_pattern_stats (&stats, XVEC (peep, 0));
d->n_generator_args = 0;
d->n_operands = stats.num_insn_operands;
d->n_dups = 0;
validate_insn_alternatives (d);
place_operands (d);
process_template (d, XTMPL (peep, 2));
}
/* Process a define_expand just read. Assign its code number,
only for the purposes of `insn_gen_function'. */
static void
gen_expand (rtx insn, int lineno)
{
struct pattern_stats stats;
struct data *d = XNEW (struct data);
int i;
d->code_number = next_code_number;
d->index_number = next_index_number;
d->filename = read_md_filename;
d->lineno = lineno;
if (XSTR (insn, 0)[0])
d->name = XSTR (insn, 0);
else
d->name = 0;
/* Build up the list in the same order as the insns are seen
in the machine description. */
d->next = 0;
*idata_end = d;
idata_end = &d->next;
memset (d->operand, 0, sizeof (d->operand));
/* Scan the operands to get the specified predicates and modes,
since expand_binop needs to know them. */
if (XVEC (insn, 1))
for (i = 0; i < XVECLEN (insn, 1); i++)
scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
get_pattern_stats (&stats, XVEC (insn, 1));
d->n_generator_args = stats.num_generator_args;
d->n_operands = stats.num_insn_operands;
d->n_dups = stats.num_dups;
d->template_code = 0;
d->output_format = INSN_OUTPUT_FORMAT_NONE;
validate_insn_alternatives (d);
validate_optab_operands (d);
place_operands (d);
}
/* Process a define_split just read. Assign its code number,
only for reasons of consistency and to simplify genrecog. */
static void
gen_split (rtx split, int lineno)
{
struct pattern_stats stats;
struct data *d = XNEW (struct data);
int i;
d->code_number = next_code_number;
d->index_number = next_index_number;
d->filename = read_md_filename;
d->lineno = lineno;
d->name = 0;
/* Build up the list in the same order as the insns are seen
in the machine description. */
d->next = 0;
*idata_end = d;
idata_end = &d->next;
memset (d->operand, 0, sizeof (d->operand));
/* Get the number of operands by scanning all the patterns of the
split patterns. But ignore all the rest of the information thus
obtained. */
for (i = 0; i < XVECLEN (split, 0); i++)
scan_operands (d, XVECEXP (split, 0, i), 0, 0);
get_pattern_stats (&stats, XVEC (split, 0));
d->n_generator_args = 0;
d->n_operands = stats.num_insn_operands;
d->n_dups = 0;
d->n_alternatives = 0;
d->template_code = 0;
d->output_format = INSN_OUTPUT_FORMAT_NONE;
place_operands (d);
}
static void
init_insn_for_nothing (void)
{
memset (¬hing, 0, sizeof (nothing));
nothing.name = "*placeholder_for_nothing";
nothing.filename = "";
}
extern int main (int, char **);
int
main (int argc, char **argv)
{
rtx desc;
progname = "genoutput";
init_insn_for_nothing ();
if (!init_rtx_reader_args (argc, argv))
return (FATAL_EXIT_CODE);
output_prologue ();
next_index_number = 0;
/* Read the machine description. */
while (1)
{
int line_no;
desc = read_md_rtx (&line_no, &next_code_number);
if (desc == NULL)
break;
switch (GET_CODE (desc))
{
case DEFINE_INSN:
gen_insn (desc, line_no);
break;
case DEFINE_PEEPHOLE:
gen_peephole (desc, line_no);
break;
case DEFINE_EXPAND:
gen_expand (desc, line_no);
break;
case DEFINE_SPLIT:
case DEFINE_PEEPHOLE2:
gen_split (desc, line_no);
break;
case DEFINE_CONSTRAINT:
case DEFINE_REGISTER_CONSTRAINT:
case DEFINE_ADDRESS_CONSTRAINT:
case DEFINE_MEMORY_CONSTRAINT:
note_constraint (desc, line_no);
break;
default:
break;
}
next_index_number++;
}
printf ("\n\n");
output_operand_data ();
output_insn_data ();
output_get_insn_name ();
fflush (stdout);
return (ferror (stdout) != 0 || have_error
? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
}
/* Return the number of occurrences of character C in string S or
-1 if S is the null string. */
static int
n_occurrences (int c, const char *s)
{
int n = 0;
if (s == 0 || *s == '\0')
return -1;
while (*s)
n += (*s++ == c);
return n;
}
/* Remove whitespace in `s' by moving up characters until the end.
Return a new string. */
static const char *
strip_whitespace (const char *s)
{
char *p, *q;
char ch;
if (s == 0)
return 0;
p = q = XNEWVEC (char, strlen (s) + 1);
while ((ch = *s++) != '\0')
if (! ISSPACE (ch))
*p++ = ch;
*p = '\0';
return q;
}
/* Record just enough information about a constraint to allow checking
of operand constraint strings above, in validate_insn_alternatives.
Does not validate most properties of the constraint itself; does
enforce no duplicate names, no overlap with MI constraints, and no
prefixes. EXP is the define_*constraint form, LINENO the line number
reported by the reader. */
static void
note_constraint (rtx exp, int lineno)
{
const char *name = XSTR (exp, 0);
struct constraint_data **iter, **slot, *new_cdata;
if (strcmp (name, "TARGET_MEM_CONSTRAINT") == 0)
name = general_mem;
unsigned int namelen = strlen (name);
if (strchr (indep_constraints, name[0]))
{
if (name[1] == '\0')
error_with_line (lineno, "constraint letter '%s' cannot be "
"redefined by the machine description", name);
else
error_with_line (lineno, "constraint name '%s' cannot be defined by "
"the machine description, as it begins with '%c'",
name, name[0]);
return;
}
slot = &constraints_by_letter_table[(unsigned int)name[0]];
for (iter = slot; *iter; iter = &(*iter)->next_this_letter)
{
/* This causes slot to end up pointing to the
next_this_letter field of the last constraint with a name
of equal or greater length than the new constraint; hence
the new constraint will be inserted after all previous
constraints with names of the same length. */
if ((*iter)->namelen >= namelen)
slot = iter;
if (!strcmp ((*iter)->name, name))
{
error_with_line (lineno, "redefinition of constraint '%s'", name);
message_with_line ((*iter)->lineno, "previous definition is here");
return;
}
else if (!strncmp ((*iter)->name, name, (*iter)->namelen))
{
error_with_line (lineno, "defining constraint '%s' here", name);
message_with_line ((*iter)->lineno, "renders constraint '%s' "
"(defined here) a prefix", (*iter)->name);
return;
}
else if (!strncmp ((*iter)->name, name, namelen))
{
error_with_line (lineno, "constraint '%s' is a prefix", name);
message_with_line ((*iter)->lineno, "of constraint '%s' "
"(defined here)", (*iter)->name);
return;
}
}
new_cdata = XNEWVAR (struct constraint_data, sizeof (struct constraint_data) + namelen);
strcpy (CONST_CAST (char *, new_cdata->name), name);
new_cdata->namelen = namelen;
new_cdata->lineno = lineno;
new_cdata->next_this_letter = *slot;
*slot = new_cdata;
}
/* Return the length of the constraint name beginning at position S
of an operand constraint string, or issue an error message if there
is no such constraint. Does not expect to be called for generic
constraints. */
static int
mdep_constraint_len (const char *s, int lineno, int opno)
{
struct constraint_data *p;
p = constraints_by_letter_table[(unsigned int)s[0]];
if (p)
for (; p; p = p->next_this_letter)
if (!strncmp (s, p->name, p->namelen))
return p->namelen;
error_with_line (lineno,
"error: undefined machine-specific constraint "
"at this point: \"%s\"", s);
message_with_line (lineno, "note: in operand %d", opno);
return 1; /* safe */
}