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|
/* Generate code from machine description to emit insns 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"
static int insn_code_number;
static int insn_index_number;
/* Data structure for recording the patterns of insns that have CLOBBERs.
We use this to output a function that adds these CLOBBERs to a
previously-allocated PARALLEL expression. */
struct clobber_pat
{
struct clobber_ent *insns;
rtx pattern;
int first_clobber;
struct clobber_pat *next;
int has_hard_reg;
} *clobber_list;
/* Records one insn that uses the clobber list. */
struct clobber_ent
{
int code_number; /* Counts only insns. */
struct clobber_ent *next;
};
static void print_code (RTX_CODE);
static void gen_exp (rtx, enum rtx_code, char *);
static void gen_insn (rtx, int);
static void gen_expand (rtx);
static void gen_split (rtx);
static void output_add_clobbers (void);
static void output_added_clobbers_hard_reg_p (void);
static void gen_rtx_scratch (rtx, enum rtx_code);
static void output_peephole2_scratches (rtx);
static void
print_code (RTX_CODE code)
{
const char *p1;
for (p1 = GET_RTX_NAME (code); *p1; p1++)
putchar (TOUPPER (*p1));
}
static void
gen_rtx_scratch (rtx x, enum rtx_code subroutine_type)
{
if (subroutine_type == DEFINE_PEEPHOLE2)
{
printf ("operand%d", XINT (x, 0));
}
else
{
printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
}
}
/* Print a C expression to construct an RTX just like X,
substituting any operand references appearing within. */
static void
gen_exp (rtx x, enum rtx_code subroutine_type, char *used)
{
RTX_CODE code;
int i;
int len;
const char *fmt;
const char *sep = "";
if (x == 0)
{
printf ("NULL_RTX");
return;
}
code = GET_CODE (x);
switch (code)
{
case MATCH_OPERAND:
case MATCH_DUP:
if (used)
{
if (used[XINT (x, 0)])
{
printf ("copy_rtx (operand%d)", XINT (x, 0));
return;
}
used[XINT (x, 0)] = 1;
}
printf ("operand%d", XINT (x, 0));
return;
case MATCH_OP_DUP:
printf ("gen_rtx_fmt_");
for (i = 0; i < XVECLEN (x, 1); i++)
printf ("e");
printf (" (GET_CODE (operand%d), ", XINT (x, 0));
if (GET_MODE (x) == VOIDmode)
printf ("GET_MODE (operand%d)", XINT (x, 0));
else
printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
for (i = 0; i < XVECLEN (x, 1); i++)
{
printf (",\n\t\t");
gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
}
printf (")");
return;
case MATCH_OPERATOR:
printf ("gen_rtx_fmt_");
for (i = 0; i < XVECLEN (x, 2); i++)
printf ("e");
printf (" (GET_CODE (operand%d)", XINT (x, 0));
printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
for (i = 0; i < XVECLEN (x, 2); i++)
{
printf (",\n\t\t");
gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
}
printf (")");
return;
case MATCH_PARALLEL:
case MATCH_PAR_DUP:
printf ("operand%d", XINT (x, 0));
return;
case MATCH_SCRATCH:
gen_rtx_scratch (x, subroutine_type);
return;
case PC:
printf ("pc_rtx");
return;
case RETURN:
printf ("ret_rtx");
return;
case SIMPLE_RETURN:
printf ("simple_return_rtx");
return;
case CLOBBER:
if (REG_P (XEXP (x, 0)))
{
printf ("gen_hard_reg_clobber (%smode, %i)", GET_MODE_NAME (GET_MODE (XEXP (x, 0))),
REGNO (XEXP (x, 0)));
return;
}
break;
case CC0:
printf ("cc0_rtx");
return;
case CONST_INT:
if (INTVAL (x) == 0)
printf ("const0_rtx");
else if (INTVAL (x) == 1)
printf ("const1_rtx");
else if (INTVAL (x) == -1)
printf ("constm1_rtx");
else if (-MAX_SAVED_CONST_INT <= INTVAL (x)
&& INTVAL (x) <= MAX_SAVED_CONST_INT)
printf ("const_int_rtx[MAX_SAVED_CONST_INT + (%d)]",
(int) INTVAL (x));
else if (INTVAL (x) == STORE_FLAG_VALUE)
printf ("const_true_rtx");
else
{
printf ("GEN_INT (");
printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));
printf (")");
}
return;
case CONST_DOUBLE:
case CONST_FIXED:
case CONST_WIDE_INT:
/* These shouldn't be written in MD files. Instead, the appropriate
routines in varasm.c should be called. */
gcc_unreachable ();
default:
break;
}
printf ("gen_rtx_");
print_code (code);
printf (" (");
if (!always_void_p (code))
{
printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
sep = ",\n\t";
}
fmt = GET_RTX_FORMAT (code);
len = GET_RTX_LENGTH (code);
for (i = 0; i < len; i++)
{
if (fmt[i] == '0')
break;
fputs (sep, stdout);
switch (fmt[i])
{
case 'e': case 'u':
gen_exp (XEXP (x, i), subroutine_type, used);
break;
case 'i':
printf ("%u", XINT (x, i));
break;
case 'r':
printf ("%u", REGNO (x));
break;
case 's':
printf ("\"%s\"", XSTR (x, i));
break;
case 'E':
{
int j;
printf ("gen_rtvec (%d", XVECLEN (x, i));
for (j = 0; j < XVECLEN (x, i); j++)
{
printf (",\n\t\t");
gen_exp (XVECEXP (x, i, j), subroutine_type, used);
}
printf (")");
break;
}
default:
gcc_unreachable ();
}
sep = ",\n\t";
}
printf (")");
}
/* Output code to emit the instruction patterns in VEC, with each element
becoming a separate instruction. USED is as for gen_exp. */
static void
gen_emit_seq (rtvec vec, char *used)
{
for (int i = 0, len = GET_NUM_ELEM (vec); i < len; ++i)
{
bool last_p = (i == len - 1);
rtx next = RTVEC_ELT (vec, i);
if (const char *name = get_emit_function (next))
{
printf (" %s (", name);
gen_exp (next, DEFINE_EXPAND, used);
printf (");\n");
if (!last_p && needs_barrier_p (next))
printf (" emit_barrier ();");
}
else
{
printf (" emit (");
gen_exp (next, DEFINE_EXPAND, used);
printf (", %s);\n", last_p ? "false" : "true");
}
}
}
/* Generate the `gen_...' function for a DEFINE_INSN. */
static void
gen_insn (rtx insn, int lineno)
{
struct pattern_stats stats;
int i;
/* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
registers or MATCH_SCRATCHes. If so, store away the information for
later. */
if (XVEC (insn, 1))
{
int has_hard_reg = 0;
for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
{
if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
break;
if (REG_P (XEXP (XVECEXP (insn, 1, i), 0)))
has_hard_reg = 1;
else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
break;
}
if (i != XVECLEN (insn, 1) - 1)
{
struct clobber_pat *p;
struct clobber_ent *link = XNEW (struct clobber_ent);
int j;
link->code_number = insn_code_number;
/* See if any previous CLOBBER_LIST entry is the same as this
one. */
for (p = clobber_list; p; p = p->next)
{
if (p->first_clobber != i + 1
|| XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
continue;
for (j = i + 1; j < XVECLEN (insn, 1); j++)
{
rtx old_rtx = XEXP (XVECEXP (p->pattern, 1, j), 0);
rtx new_rtx = XEXP (XVECEXP (insn, 1, j), 0);
/* OLD and NEW_INSN are the same if both are to be a SCRATCH
of the same mode,
or if both are registers of the same mode and number. */
if (! (GET_MODE (old_rtx) == GET_MODE (new_rtx)
&& ((GET_CODE (old_rtx) == MATCH_SCRATCH
&& GET_CODE (new_rtx) == MATCH_SCRATCH)
|| (REG_P (old_rtx) && REG_P (new_rtx)
&& REGNO (old_rtx) == REGNO (new_rtx)))))
break;
}
if (j == XVECLEN (insn, 1))
break;
}
if (p == 0)
{
p = XNEW (struct clobber_pat);
p->insns = 0;
p->pattern = insn;
p->first_clobber = i + 1;
p->next = clobber_list;
p->has_hard_reg = has_hard_reg;
clobber_list = p;
}
link->next = p->insns;
p->insns = link;
}
}
/* Don't mention instructions whose names are the null string
or begin with '*'. They are in the machine description just
to be recognized. */
if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
return;
printf ("/* %s:%d */\n", read_md_filename, lineno);
/* Find out how many operands this function has. */
get_pattern_stats (&stats, XVEC (insn, 1));
if (stats.max_dup_opno > stats.max_opno)
fatal ("match_dup operand number has no match_operand");
/* Output the function name and argument declarations. */
printf ("rtx\ngen_%s (", XSTR (insn, 0));
if (stats.num_generator_args)
for (i = 0; i < stats.num_generator_args; i++)
if (i)
printf (",\n\trtx operand%d ATTRIBUTE_UNUSED", i);
else
printf ("rtx operand%d ATTRIBUTE_UNUSED", i);
else
printf ("void");
printf (")\n");
printf ("{\n");
/* Output code to construct and return the rtl for the instruction body. */
rtx pattern = add_implicit_parallel (XVEC (insn, 1));
/* ??? This is the traditional behavior, but seems suspect. */
char *used = (XVECLEN (insn, 1) == 1
? NULL
: XCNEWVEC (char, stats.num_generator_args));
printf (" return ");
gen_exp (pattern, DEFINE_INSN, used);
printf (";\n}\n\n");
XDELETEVEC (used);
}
/* Generate the `gen_...' function for a DEFINE_EXPAND. */
static void
gen_expand (rtx expand)
{
struct pattern_stats stats;
int i;
char *used;
if (strlen (XSTR (expand, 0)) == 0)
fatal ("define_expand lacks a name");
if (XVEC (expand, 1) == 0)
fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
/* Find out how many operands this function has. */
get_pattern_stats (&stats, XVEC (expand, 1));
/* Output the function name and argument declarations. */
printf ("rtx\ngen_%s (", XSTR (expand, 0));
if (stats.num_generator_args)
for (i = 0; i < stats.num_generator_args; i++)
if (i)
printf (",\n\trtx operand%d", i);
else
printf ("rtx operand%d", i);
else
printf ("void");
printf (")\n");
printf ("{\n");
/* If we don't have any C code to write, only one insn is being written,
and no MATCH_DUPs are present, we can just return the desired insn
like we do for a DEFINE_INSN. This saves memory. */
if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
&& stats.max_opno >= stats.max_dup_opno
&& XVECLEN (expand, 1) == 1)
{
printf (" return ");
gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
printf (";\n}\n\n");
return;
}
/* For each operand referred to only with MATCH_DUPs,
make a local variable. */
for (i = stats.num_generator_args; i <= stats.max_dup_opno; i++)
printf (" rtx operand%d;\n", i);
for (; i <= stats.max_scratch_opno; i++)
printf (" rtx operand%d ATTRIBUTE_UNUSED;\n", i);
printf (" rtx_insn *_val = 0;\n");
printf (" start_sequence ();\n");
/* The fourth operand of DEFINE_EXPAND is some code to be executed
before the actual construction.
This code expects to refer to `operands'
just as the output-code in a DEFINE_INSN does,
but here `operands' is an automatic array.
So copy the operand values there before executing it. */
if (XSTR (expand, 3) && *XSTR (expand, 3))
{
printf (" {\n");
if (stats.num_operand_vars > 0)
printf (" rtx operands[%d];\n", stats.num_operand_vars);
/* Output code to copy the arguments into `operands'. */
for (i = 0; i < stats.num_generator_args; i++)
printf (" operands[%d] = operand%d;\n", i, i);
/* Output the special code to be executed before the sequence
is generated. */
print_md_ptr_loc (XSTR (expand, 3));
printf ("%s\n", XSTR (expand, 3));
/* Output code to copy the arguments back out of `operands'
(unless we aren't going to use them at all). */
if (XVEC (expand, 1) != 0)
{
for (i = 0; i < stats.num_operand_vars; i++)
{
printf (" operand%d = operands[%d];\n", i, i);
printf (" (void) operand%d;\n", i);
}
}
printf (" }\n");
}
used = XCNEWVEC (char, stats.num_operand_vars);
gen_emit_seq (XVEC (expand, 1), used);
XDELETEVEC (used);
/* Call `get_insns' to extract the list of all the
insns emitted within this gen_... function. */
printf (" _val = get_insns ();\n");
printf (" end_sequence ();\n");
printf (" return _val;\n}\n\n");
}
/* Like gen_expand, but generates insns resulting from splitting SPLIT. */
static void
gen_split (rtx split)
{
struct pattern_stats stats;
int i;
const char *const name =
((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
const char *unused;
char *used;
if (XVEC (split, 0) == 0)
fatal ("define_%s (definition %d) lacks a pattern", name,
insn_index_number);
else if (XVEC (split, 2) == 0)
fatal ("define_%s (definition %d) lacks a replacement pattern", name,
insn_index_number);
/* Find out how many operands this function has. */
get_pattern_stats (&stats, XVEC (split, 2));
unused = (stats.num_operand_vars == 0 ? " ATTRIBUTE_UNUSED" : "");
used = XCNEWVEC (char, stats.num_operand_vars);
/* Output the prototype, function name and argument declarations. */
if (GET_CODE (split) == DEFINE_PEEPHOLE2)
{
printf ("extern rtx_insn *gen_%s_%d (rtx_insn *, rtx *);\n",
name, insn_code_number);
printf ("rtx_insn *\ngen_%s_%d (rtx_insn *curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
name, insn_code_number, unused);
}
else
{
printf ("extern rtx_insn *gen_split_%d (rtx_insn *, rtx *);\n",
insn_code_number);
printf ("rtx_insn *\ngen_split_%d "
"(rtx_insn *curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
insn_code_number, unused);
}
printf ("{\n");
/* Declare all local variables. */
for (i = 0; i < stats.num_operand_vars; i++)
printf (" rtx operand%d;\n", i);
printf (" rtx_insn *_val = NULL;\n");
if (GET_CODE (split) == DEFINE_PEEPHOLE2)
output_peephole2_scratches (split);
printf (" if (dump_file)\n");
printf (" fprintf (dump_file, \"Splitting with gen_%s_%d\\n\");\n",
name, insn_code_number);
printf (" start_sequence ();\n");
/* The fourth operand of DEFINE_SPLIT is some code to be executed
before the actual construction. */
if (XSTR (split, 3))
{
print_md_ptr_loc (XSTR (split, 3));
printf ("%s\n", XSTR (split, 3));
}
/* Output code to copy the arguments back out of `operands' */
for (i = 0; i < stats.num_operand_vars; i++)
{
printf (" operand%d = operands[%d];\n", i, i);
printf (" (void) operand%d;\n", i);
}
gen_emit_seq (XVEC (split, 2), used);
/* Call `get_insns' to make a list of all the
insns emitted within this gen_... function. */
printf (" _val = get_insns ();\n");
printf (" end_sequence ();\n");
printf (" return _val;\n}\n\n");
free (used);
}
/* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
the end of the vector. */
static void
output_add_clobbers (void)
{
struct clobber_pat *clobber;
struct clobber_ent *ent;
int i;
printf ("\n\nvoid\nadd_clobbers (rtx pattern ATTRIBUTE_UNUSED, int insn_code_number)\n");
printf ("{\n");
printf (" switch (insn_code_number)\n");
printf (" {\n");
for (clobber = clobber_list; clobber; clobber = clobber->next)
{
for (ent = clobber->insns; ent; ent = ent->next)
printf (" case %d:\n", ent->code_number);
for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
{
printf (" XVECEXP (pattern, 0, %d) = ", i);
gen_exp (XVECEXP (clobber->pattern, 1, i),
GET_CODE (clobber->pattern), NULL);
printf (";\n");
}
printf (" break;\n\n");
}
printf (" default:\n");
printf (" gcc_unreachable ();\n");
printf (" }\n");
printf ("}\n");
}
/* Write a function, `added_clobbers_hard_reg_p' that is given an insn_code
number that will have clobbers added (as indicated by `recog') and returns
1 if those include a clobber of a hard reg or 0 if all of them just clobber
SCRATCH. */
static void
output_added_clobbers_hard_reg_p (void)
{
struct clobber_pat *clobber;
struct clobber_ent *ent;
int clobber_p, used;
printf ("\n\nint\nadded_clobbers_hard_reg_p (int insn_code_number)\n");
printf ("{\n");
printf (" switch (insn_code_number)\n");
printf (" {\n");
for (clobber_p = 0; clobber_p <= 1; clobber_p++)
{
used = 0;
for (clobber = clobber_list; clobber; clobber = clobber->next)
if (clobber->has_hard_reg == clobber_p)
for (ent = clobber->insns; ent; ent = ent->next)
{
printf (" case %d:\n", ent->code_number);
used++;
}
if (used)
printf (" return %d;\n\n", clobber_p);
}
printf (" default:\n");
printf (" gcc_unreachable ();\n");
printf (" }\n");
printf ("}\n");
}
/* Generate code to invoke find_free_register () as needed for the
scratch registers used by the peephole2 pattern in SPLIT. */
static void
output_peephole2_scratches (rtx split)
{
int i;
int insn_nr = 0;
bool first = true;
for (i = 0; i < XVECLEN (split, 0); i++)
{
rtx elt = XVECEXP (split, 0, i);
if (GET_CODE (elt) == MATCH_SCRATCH)
{
int last_insn_nr = insn_nr;
int cur_insn_nr = insn_nr;
int j;
for (j = i + 1; j < XVECLEN (split, 0); j++)
if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
{
if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
last_insn_nr = cur_insn_nr;
}
else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
cur_insn_nr++;
if (first)
{
printf (" HARD_REG_SET _regs_allocated;\n");
printf (" CLEAR_HARD_REG_SET (_regs_allocated);\n");
first = false;
}
printf (" if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
return NULL;\n",
XINT (elt, 0),
insn_nr, last_insn_nr,
XSTR (elt, 1),
GET_MODE_NAME (GET_MODE (elt)));
}
else if (GET_CODE (elt) != MATCH_DUP)
insn_nr++;
}
}
int
main (int argc, char **argv)
{
rtx desc;
progname = "genemit";
if (!init_rtx_reader_args (argc, argv))
return (FATAL_EXIT_CODE);
/* Assign sequential codes to all entries in the machine description
in parallel with the tables in insn-output.c. */
insn_code_number = 0;
insn_index_number = 0;
printf ("/* Generated automatically by the program `genemit'\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 \"alias.h\"\n");
printf ("#include \"varasm.h\"\n");
printf ("#include \"stor-layout.h\"\n");
printf ("#include \"calls.h\"\n");
printf ("#include \"tm_p.h\"\n");
printf ("#include \"flags.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 \"optabs.h\"\n");
printf ("#include \"dfp.h\"\n");
printf ("#include \"output.h\"\n");
printf ("#include \"recog.h\"\n");
printf ("#include \"df.h\"\n");
printf ("#include \"resource.h\"\n");
printf ("#include \"reload.h\"\n");
printf ("#include \"diagnostic-core.h\"\n");
printf ("#include \"regs.h\"\n");
printf ("#include \"tm-constrs.h\"\n");
printf ("#include \"ggc.h\"\n");
printf ("#include \"dumpfile.h\"\n");
printf ("#include \"target.h\"\n\n");
printf ("#define FAIL return (end_sequence (), _val)\n");
printf ("#define DONE return (_val = get_insns (), end_sequence (), _val)\n\n");
/* Read the machine description. */
while (1)
{
int line_no;
desc = read_md_rtx (&line_no, &insn_code_number);
if (desc == NULL)
break;
switch (GET_CODE (desc))
{
case DEFINE_INSN:
gen_insn (desc, line_no);
break;
case DEFINE_EXPAND:
printf ("/* %s:%d */\n", read_md_filename, line_no);
gen_expand (desc);
break;
case DEFINE_SPLIT:
printf ("/* %s:%d */\n", read_md_filename, line_no);
gen_split (desc);
break;
case DEFINE_PEEPHOLE2:
printf ("/* %s:%d */\n", read_md_filename, line_no);
gen_split (desc);
break;
default:
break;
}
++insn_index_number;
}
/* Write out the routines to add CLOBBERs to a pattern and say whether they
clobber a hard reg. */
output_add_clobbers ();
output_added_clobbers_hard_reg_p ();
fflush (stdout);
return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
}
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