mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 07:31:32 +00:00
492 lines
12 KiB
C
492 lines
12 KiB
C
/* Generate code from machine description to extract operands from insn as 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
|
||
<http://www.gnu.org/licenses/>. */
|
||
|
||
|
||
#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"
|
||
#include "vec.h"
|
||
|
||
/* This structure contains all the information needed to describe one
|
||
set of extractions methods. Each method may be used by more than
|
||
one pattern if the operands are in the same place.
|
||
|
||
The string for each operand describes that path to the operand and
|
||
contains `0' through `9' when going into an expression and `a' through
|
||
`z' when going into a vector. We assume here that only the first operand
|
||
of an rtl expression is a vector. genrecog.c makes the same assumption
|
||
(and uses the same representation) and it is currently true. */
|
||
|
||
typedef char *locstr;
|
||
|
||
struct extraction
|
||
{
|
||
unsigned int op_count;
|
||
unsigned int dup_count;
|
||
locstr *oplocs;
|
||
locstr *duplocs;
|
||
int *dupnums;
|
||
struct code_ptr *insns;
|
||
struct extraction *next;
|
||
};
|
||
|
||
/* Holds a single insn code that uses an extraction method. */
|
||
struct code_ptr
|
||
{
|
||
int insn_code;
|
||
struct code_ptr *next;
|
||
};
|
||
|
||
/* All extractions needed for this machine description. */
|
||
static struct extraction *extractions;
|
||
|
||
/* All insn codes for old-style peepholes. */
|
||
static struct code_ptr *peepholes;
|
||
|
||
/* This structure is used by gen_insn and walk_rtx to accumulate the
|
||
data that will be used to produce an extractions structure. */
|
||
|
||
|
||
struct accum_extract
|
||
{
|
||
vec<locstr> oplocs;
|
||
vec<locstr> duplocs;
|
||
vec<int> dupnums;
|
||
vec<char> pathstr;
|
||
};
|
||
|
||
int line_no;
|
||
|
||
/* Forward declarations. */
|
||
static void walk_rtx (rtx, struct accum_extract *);
|
||
|
||
static void
|
||
gen_insn (rtx insn, int insn_code_number)
|
||
{
|
||
int i;
|
||
unsigned int op_count, dup_count, j;
|
||
struct extraction *p;
|
||
struct code_ptr *link;
|
||
struct accum_extract acc;
|
||
|
||
acc.oplocs.create (10);
|
||
acc.duplocs.create (10);
|
||
acc.dupnums.create (10);
|
||
acc.pathstr.create (20);
|
||
|
||
/* Walk the insn's pattern, remembering at all times the path
|
||
down to the walking point. */
|
||
|
||
if (XVECLEN (insn, 1) == 1)
|
||
walk_rtx (XVECEXP (insn, 1, 0), &acc);
|
||
else
|
||
for (i = XVECLEN (insn, 1) - 1; i >= 0; i--)
|
||
{
|
||
acc.pathstr.safe_push ('a' + i);
|
||
walk_rtx (XVECEXP (insn, 1, i), &acc);
|
||
acc.pathstr.pop ();
|
||
}
|
||
|
||
link = XNEW (struct code_ptr);
|
||
link->insn_code = insn_code_number;
|
||
|
||
/* See if we find something that already had this extraction method. */
|
||
|
||
op_count = acc.oplocs.length ();
|
||
dup_count = acc.duplocs.length ();
|
||
gcc_assert (dup_count == acc.dupnums.length ());
|
||
|
||
for (p = extractions; p; p = p->next)
|
||
{
|
||
if (p->op_count != op_count || p->dup_count != dup_count)
|
||
continue;
|
||
|
||
for (j = 0; j < op_count; j++)
|
||
{
|
||
char *a = p->oplocs[j];
|
||
char *b = acc.oplocs[j];
|
||
if (a != b && (!a || !b || strcmp (a, b)))
|
||
break;
|
||
}
|
||
|
||
if (j != op_count)
|
||
continue;
|
||
|
||
for (j = 0; j < dup_count; j++)
|
||
if (p->dupnums[j] != acc.dupnums[j]
|
||
|| strcmp (p->duplocs[j], acc.duplocs[j]))
|
||
break;
|
||
|
||
if (j != dup_count)
|
||
continue;
|
||
|
||
/* This extraction is the same as ours. Just link us in. */
|
||
link->next = p->insns;
|
||
p->insns = link;
|
||
goto done;
|
||
}
|
||
|
||
/* Otherwise, make a new extraction method. We stash the arrays
|
||
after the extraction structure in memory. */
|
||
|
||
p = XNEWVAR (struct extraction, sizeof (struct extraction)
|
||
+ op_count*sizeof (char *)
|
||
+ dup_count*sizeof (char *)
|
||
+ dup_count*sizeof (int));
|
||
p->op_count = op_count;
|
||
p->dup_count = dup_count;
|
||
p->next = extractions;
|
||
extractions = p;
|
||
p->insns = link;
|
||
link->next = 0;
|
||
|
||
p->oplocs = (char **)((char *)p + sizeof (struct extraction));
|
||
p->duplocs = p->oplocs + op_count;
|
||
p->dupnums = (int *)(p->duplocs + dup_count);
|
||
|
||
memcpy (p->oplocs, acc.oplocs.address (), op_count * sizeof (locstr));
|
||
memcpy (p->duplocs, acc.duplocs.address (), dup_count * sizeof (locstr));
|
||
memcpy (p->dupnums, acc.dupnums.address (), dup_count * sizeof (int));
|
||
|
||
done:
|
||
acc.oplocs.release ();
|
||
acc.duplocs.release ();
|
||
acc.dupnums.release ();
|
||
acc.pathstr.release ();
|
||
}
|
||
|
||
/* Helper subroutine of walk_rtx: given a vec<locstr>, an index, and a
|
||
string, insert the string at the index, which should either already
|
||
exist and be NULL, or not yet exist within the vector. In the latter
|
||
case the vector is enlarged as appropriate. */
|
||
static void
|
||
VEC_safe_set_locstr (vec<locstr> *vp, unsigned int ix, char *str)
|
||
{
|
||
if (ix < (*vp).length ())
|
||
{
|
||
if ((*vp)[ix])
|
||
{
|
||
message_with_line (line_no, "repeated operand number %d", ix);
|
||
have_error = 1;
|
||
}
|
||
else
|
||
(*vp)[ix] = str;
|
||
}
|
||
else
|
||
{
|
||
while (ix > (*vp).length ())
|
||
vp->safe_push (NULL);
|
||
vp->safe_push (str);
|
||
}
|
||
}
|
||
|
||
/* Another helper subroutine of walk_rtx: given a vec<char>, convert it
|
||
to a NUL-terminated string in malloc memory. */
|
||
static char *
|
||
VEC_char_to_string (vec<char> v)
|
||
{
|
||
size_t n = v.length ();
|
||
char *s = XNEWVEC (char, n + 1);
|
||
memcpy (s, v.address (), n);
|
||
s[n] = '\0';
|
||
return s;
|
||
}
|
||
|
||
static void
|
||
walk_rtx (rtx x, struct accum_extract *acc)
|
||
{
|
||
RTX_CODE code;
|
||
int i, len, base;
|
||
const char *fmt;
|
||
|
||
if (x == 0)
|
||
return;
|
||
|
||
code = GET_CODE (x);
|
||
switch (code)
|
||
{
|
||
case PC:
|
||
case CC0:
|
||
case CONST_INT:
|
||
case SYMBOL_REF:
|
||
return;
|
||
|
||
case MATCH_OPERAND:
|
||
case MATCH_SCRATCH:
|
||
VEC_safe_set_locstr (&acc->oplocs, XINT (x, 0),
|
||
VEC_char_to_string (acc->pathstr));
|
||
break;
|
||
|
||
case MATCH_OPERATOR:
|
||
case MATCH_PARALLEL:
|
||
VEC_safe_set_locstr (&acc->oplocs, XINT (x, 0),
|
||
VEC_char_to_string (acc->pathstr));
|
||
|
||
base = (code == MATCH_OPERATOR ? '0' : 'a');
|
||
for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
|
||
{
|
||
acc->pathstr.safe_push (base + i);
|
||
walk_rtx (XVECEXP (x, 2, i), acc);
|
||
acc->pathstr.pop ();
|
||
}
|
||
return;
|
||
|
||
case MATCH_DUP:
|
||
case MATCH_PAR_DUP:
|
||
case MATCH_OP_DUP:
|
||
acc->duplocs.safe_push (VEC_char_to_string (acc->pathstr));
|
||
acc->dupnums.safe_push (XINT (x, 0));
|
||
|
||
if (code == MATCH_DUP)
|
||
break;
|
||
|
||
base = (code == MATCH_OP_DUP ? '0' : 'a');
|
||
for (i = XVECLEN (x, 1) - 1; i >= 0; i--)
|
||
{
|
||
acc->pathstr.safe_push (base + i);
|
||
walk_rtx (XVECEXP (x, 1, i), acc);
|
||
acc->pathstr.pop ();
|
||
}
|
||
return;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
fmt = GET_RTX_FORMAT (code);
|
||
len = GET_RTX_LENGTH (code);
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
if (fmt[i] == 'e' || fmt[i] == 'u')
|
||
{
|
||
acc->pathstr.safe_push ('0' + i);
|
||
walk_rtx (XEXP (x, i), acc);
|
||
acc->pathstr.pop ();
|
||
}
|
||
else if (fmt[i] == 'E')
|
||
{
|
||
int j;
|
||
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
|
||
{
|
||
acc->pathstr.safe_push ('a' + j);
|
||
walk_rtx (XVECEXP (x, i, j), acc);
|
||
acc->pathstr.pop ();
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Given a PATH, representing a path down the instruction's
|
||
pattern from the root to a certain point, output code to
|
||
evaluate to the rtx at that point. */
|
||
|
||
static void
|
||
print_path (const char *path)
|
||
{
|
||
int len = strlen (path);
|
||
int i;
|
||
|
||
if (len == 0)
|
||
{
|
||
/* Don't emit "pat", since we may try to take the address of it,
|
||
which isn't what is intended. */
|
||
fputs ("PATTERN (insn)", stdout);
|
||
return;
|
||
}
|
||
|
||
/* We first write out the operations (XEXP or XVECEXP) in reverse
|
||
order, then write "pat", then the indices in forward order. */
|
||
|
||
for (i = len - 1; i >= 0 ; i--)
|
||
{
|
||
if (ISLOWER (path[i]))
|
||
fputs ("XVECEXP (", stdout);
|
||
else if (ISDIGIT (path[i]))
|
||
fputs ("XEXP (", stdout);
|
||
else
|
||
gcc_unreachable ();
|
||
}
|
||
|
||
fputs ("pat", stdout);
|
||
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
if (ISLOWER (path[i]))
|
||
printf (", 0, %d)", path[i] - 'a');
|
||
else if (ISDIGIT (path[i]))
|
||
printf (", %d)", path[i] - '0');
|
||
else
|
||
gcc_unreachable ();
|
||
}
|
||
}
|
||
|
||
static void
|
||
print_header (void)
|
||
{
|
||
/* N.B. Code below avoids putting squiggle braces in column 1 inside
|
||
a string, because this confuses some editors' syntax highlighting
|
||
engines. */
|
||
|
||
puts ("\
|
||
/* Generated automatically by the program `genextract'\n\
|
||
from the machine description file `md'. */\n\
|
||
\n\
|
||
#include \"config.h\"\n\
|
||
#include \"system.h\"\n\
|
||
#include \"coretypes.h\"\n\
|
||
#include \"tm.h\"\n\
|
||
#include \"rtl.h\"\n\
|
||
#include \"insn-config.h\"\n\
|
||
#include \"recog.h\"\n\
|
||
#include \"diagnostic-core.h\"\n\
|
||
\n\
|
||
/* This variable is used as the \"location\" of any missing operand\n\
|
||
whose numbers are skipped by a given pattern. */\n\
|
||
static rtx junk ATTRIBUTE_UNUSED;\n");
|
||
|
||
puts ("\
|
||
void\n\
|
||
insn_extract (rtx_insn *insn)\n{\n\
|
||
rtx *ro = recog_data.operand;\n\
|
||
rtx **ro_loc = recog_data.operand_loc;\n\
|
||
rtx pat = PATTERN (insn);\n\
|
||
int i ATTRIBUTE_UNUSED; /* only for peepholes */\n\
|
||
\n\
|
||
#ifdef ENABLE_CHECKING\n\
|
||
memset (ro, 0xab, sizeof (*ro) * MAX_RECOG_OPERANDS);\n\
|
||
memset (ro_loc, 0xab, sizeof (*ro_loc) * MAX_RECOG_OPERANDS);\n\
|
||
#endif\n");
|
||
|
||
puts ("\
|
||
switch (INSN_CODE (insn))\n\
|
||
{\n\
|
||
default:\n\
|
||
/* Control reaches here if insn_extract has been called with an\n\
|
||
unrecognizable insn (code -1), or an insn whose INSN_CODE\n\
|
||
corresponds to a DEFINE_EXPAND in the machine description;\n\
|
||
either way, a bug. */\n\
|
||
if (INSN_CODE (insn) < 0)\n\
|
||
fatal_insn (\"unrecognizable insn:\", insn);\n\
|
||
else\n\
|
||
fatal_insn (\"insn with invalid code number:\", insn);\n");
|
||
}
|
||
|
||
int
|
||
main (int argc, char **argv)
|
||
{
|
||
rtx desc;
|
||
unsigned int i;
|
||
struct extraction *p;
|
||
struct code_ptr *link;
|
||
const char *name;
|
||
int insn_code_number;
|
||
|
||
progname = "genextract";
|
||
|
||
if (!init_rtx_reader_args (argc, argv))
|
||
return (FATAL_EXIT_CODE);
|
||
|
||
/* Read the machine description. */
|
||
|
||
while ((desc = read_md_rtx (&line_no, &insn_code_number)) != NULL)
|
||
{
|
||
if (GET_CODE (desc) == DEFINE_INSN)
|
||
gen_insn (desc, insn_code_number);
|
||
|
||
else if (GET_CODE (desc) == DEFINE_PEEPHOLE)
|
||
{
|
||
struct code_ptr *link = XNEW (struct code_ptr);
|
||
|
||
link->insn_code = insn_code_number;
|
||
link->next = peepholes;
|
||
peepholes = link;
|
||
}
|
||
}
|
||
|
||
if (have_error)
|
||
return FATAL_EXIT_CODE;
|
||
|
||
print_header ();
|
||
|
||
/* Write out code to handle peepholes and the insn_codes that it should
|
||
be called for. */
|
||
if (peepholes)
|
||
{
|
||
for (link = peepholes; link; link = link->next)
|
||
printf (" case %d:\n", link->insn_code);
|
||
|
||
/* The vector in the insn says how many operands it has.
|
||
And all it contains are operands. In fact, the vector was
|
||
created just for the sake of this function. We need to set the
|
||
location of the operands for sake of simplifications after
|
||
extraction, like eliminating subregs. */
|
||
puts (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n"
|
||
" ro[i] = *(ro_loc[i] = &XVECEXP (pat, 0, i));\n"
|
||
" break;\n");
|
||
}
|
||
|
||
/* Write out all the ways to extract insn operands. */
|
||
for (p = extractions; p; p = p->next)
|
||
{
|
||
for (link = p->insns; link; link = link->next)
|
||
{
|
||
i = link->insn_code;
|
||
name = get_insn_name (i);
|
||
if (name)
|
||
printf (" case %d: /* %s */\n", i, name);
|
||
else
|
||
printf (" case %d:\n", i);
|
||
}
|
||
|
||
for (i = 0; i < p->op_count; i++)
|
||
{
|
||
if (p->oplocs[i] == 0)
|
||
{
|
||
printf (" ro[%d] = const0_rtx;\n", i);
|
||
printf (" ro_loc[%d] = &junk;\n", i);
|
||
}
|
||
else
|
||
{
|
||
printf (" ro[%d] = *(ro_loc[%d] = &", i, i);
|
||
print_path (p->oplocs[i]);
|
||
puts (");");
|
||
}
|
||
}
|
||
|
||
for (i = 0; i < p->dup_count; i++)
|
||
{
|
||
printf (" recog_data.dup_loc[%d] = &", i);
|
||
print_path (p->duplocs[i]);
|
||
puts (";");
|
||
printf (" recog_data.dup_num[%d] = %d;\n", i, p->dupnums[i]);
|
||
}
|
||
|
||
puts (" break;\n");
|
||
}
|
||
|
||
puts (" }\n}");
|
||
fflush (stdout);
|
||
return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
|
||
}
|