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genpreds.c
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/* Generate from machine description:
- prototype declarations for operand predicates (tm-preds.h)
- function definitions of operand predicates, if defined new-style
(insn-preds.c)
Copyright (C) 2001-2020 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 "obstack.h"
#include "read-md.h"
#include "gensupport.h"
static char general_mem[] = { TARGET_MEM_CONSTRAINT, 0 };
/* Given a predicate expression EXP, from form NAME at location LOC,
verify that it does not contain any RTL constructs which are not
valid in predicate definitions. Returns true if EXP is
INvalid; issues error messages, caller need not. */
static bool
validate_exp (rtx exp, const char *name, file_location loc)
{
if (exp == 0)
{
message_at (loc, "%s: must give a predicate expression", name);
return true;
}
switch (GET_CODE (exp))
{
/* Ternary, binary, unary expressions: recurse into subexpressions. */
case IF_THEN_ELSE:
if (validate_exp (XEXP (exp, 2), name, loc))
return true;
/* fall through */
case AND:
case IOR:
if (validate_exp (XEXP (exp, 1), name, loc))
return true;
/* fall through */
case NOT:
return validate_exp (XEXP (exp, 0), name, loc);
/* MATCH_CODE might have a syntax error in its path expression. */
case MATCH_CODE:
{
const char *p;
for (p = XSTR (exp, 1); *p; p++)
{
if (!ISDIGIT (*p) && !ISLOWER (*p))
{
error_at (loc, "%s: invalid character in path "
"string '%s'", name, XSTR (exp, 1));
return true;
}
}
}
gcc_fallthrough ();
/* These need no special checking. */
case MATCH_OPERAND:
case MATCH_TEST:
return false;
default:
error_at (loc, "%s: cannot use '%s' in a predicate expression",
name, GET_RTX_NAME (GET_CODE (exp)));
return true;
}
}
/* Predicates are defined with (define_predicate) or
(define_special_predicate) expressions in the machine description. */
static void
process_define_predicate (md_rtx_info *info)
{
validate_exp (XEXP (info->def, 1), XSTR (info->def, 0), info->loc);
}
/* Given a predicate, if it has an embedded C block, write the block
out as a static inline subroutine, and augment the RTL test with a
match_test that calls that subroutine. For instance,
(define_predicate "basereg_operand"
(match_operand 0 "register_operand")
{
if (GET_CODE (op) == SUBREG)
op = SUBREG_REG (op);
return REG_POINTER (op);
})
becomes
static inline int basereg_operand_1(rtx op, machine_mode mode)
{
if (GET_CODE (op) == SUBREG)
op = SUBREG_REG (op);
return REG_POINTER (op);
}
(define_predicate "basereg_operand"
(and (match_operand 0 "register_operand")
(match_test "basereg_operand_1 (op, mode)")))
The only wart is that there's no way to insist on a { } string in
an RTL template, so we have to handle "" strings. */
static void
write_predicate_subfunction (struct pred_data *p)
{
const char *match_test_str;
rtx match_test_exp, and_exp;
if (p->c_block[0] == '\0')
return;
/* Construct the function-call expression. */
obstack_grow (rtl_obstack, p->name, strlen (p->name));
obstack_grow (rtl_obstack, "_1 (op, mode)",
sizeof "_1 (op, mode)");
match_test_str = XOBFINISH (rtl_obstack, const char *);
/* Add the function-call expression to the complete expression to be
evaluated. */
match_test_exp = rtx_alloc (MATCH_TEST);
XSTR (match_test_exp, 0) = match_test_str;
and_exp = rtx_alloc (AND);
XEXP (and_exp, 0) = p->exp;
XEXP (and_exp, 1) = match_test_exp;
p->exp = and_exp;
printf ("static inline int\n"
"%s_1 (rtx op ATTRIBUTE_UNUSED, machine_mode mode ATTRIBUTE_UNUSED)\n",
p->name);
rtx_reader_ptr->print_md_ptr_loc (p->c_block);
if (p->c_block[0] == '{')
fputs (p->c_block, stdout);
else
printf ("{\n %s\n}", p->c_block);
fputs ("\n\n", stdout);
}
/* Given a predicate expression EXP, from form NAME, determine whether
it refers to the variable given as VAR. */
static bool
needs_variable (rtx exp, const char *var)
{
switch (GET_CODE (exp))
{
/* Ternary, binary, unary expressions need a variable if
any of their subexpressions do. */
case IF_THEN_ELSE:
if (needs_variable (XEXP (exp, 2), var))
return true;
/* fall through */
case AND:
case IOR:
if (needs_variable (XEXP (exp, 1), var))
return true;
/* fall through */
case NOT:
return needs_variable (XEXP (exp, 0), var);
/* MATCH_CODE uses "op", but nothing else. */
case MATCH_CODE:
return !strcmp (var, "op");
/* MATCH_OPERAND uses "op" and may use "mode". */
case MATCH_OPERAND:
if (!strcmp (var, "op"))
return true;
if (!strcmp (var, "mode") && GET_MODE (exp) == VOIDmode)
return true;
return false;
/* MATCH_TEST uses var if XSTR (exp, 0) =~ /\b${var}\b/o; */
case MATCH_TEST:
{
const char *p = XSTR (exp, 0);
const char *q = strstr (p, var);
if (!q)
return false;
if (q != p && (ISALNUM (q[-1]) || q[-1] == '_'))
return false;
q += strlen (var);
if (ISALNUM (q[0]) || q[0] == '_')
return false;
}
return true;
default:
gcc_unreachable ();
}
}
/* Given an RTL expression EXP, find all subexpressions which we may
assume to perform mode tests. Normal MATCH_OPERAND does;
MATCH_CODE doesn't as such (although certain codes always have
VOIDmode); and we have to assume that MATCH_TEST does not.
These combine in almost-boolean fashion - the only exception is
that (not X) must be assumed not to perform a mode test, whether
or not X does.
The mark is the RTL /v flag, which is true for subexpressions which
do *not* perform mode tests.
*/
#define NO_MODE_TEST(EXP) RTX_FLAG (EXP, volatil)
static void
mark_mode_tests (rtx exp)
{
switch (GET_CODE (exp))
{
case MATCH_OPERAND:
{
struct pred_data *p = lookup_predicate (XSTR (exp, 1));
if (!p)
error ("reference to undefined predicate '%s'", XSTR (exp, 1));
else if (p->special || GET_MODE (exp) != VOIDmode)
NO_MODE_TEST (exp) = 1;
}
break;
case MATCH_CODE:
NO_MODE_TEST (exp) = 1;
break;
case MATCH_TEST:
case NOT:
NO_MODE_TEST (exp) = 1;
break;
case AND:
mark_mode_tests (XEXP (exp, 0));
mark_mode_tests (XEXP (exp, 1));
NO_MODE_TEST (exp) = (NO_MODE_TEST (XEXP (exp, 0))
&& NO_MODE_TEST (XEXP (exp, 1)));
break;
case IOR:
mark_mode_tests (XEXP (exp, 0));
mark_mode_tests (XEXP (exp, 1));
NO_MODE_TEST (exp) = (NO_MODE_TEST (XEXP (exp, 0))
|| NO_MODE_TEST (XEXP (exp, 1)));
break;
case IF_THEN_ELSE:
/* A ? B : C does a mode test if (one of A and B) does a mode
test, and C does too. */
mark_mode_tests (XEXP (exp, 0));
mark_mode_tests (XEXP (exp, 1));
mark_mode_tests (XEXP (exp, 2));
NO_MODE_TEST (exp) = ((NO_MODE_TEST (XEXP (exp, 0))
&& NO_MODE_TEST (XEXP (exp, 1)))
|| NO_MODE_TEST (XEXP (exp, 2)));
break;
default:
gcc_unreachable ();
}
}
/* Determine whether the expression EXP is a MATCH_CODE that should
be written as a switch statement. */
static bool
generate_switch_p (rtx exp)
{
return GET_CODE (exp) == MATCH_CODE
&& strchr (XSTR (exp, 0), ',');
}
/* Given a predicate, work out where in its RTL expression to add
tests for proper modes. Special predicates do not get any such
tests. We try to avoid adding tests when we don't have to; in
particular, other normal predicates can be counted on to do it for
us. */
static void
add_mode_tests (struct pred_data *p)
{
rtx match_test_exp, and_exp;
rtx *pos;
/* Don't touch special predicates. */
if (p->special)
return;
/* Check whether the predicate accepts const scalar ints (which always
have a stored mode of VOIDmode, but logically have a real mode)
and whether it matches anything besides const scalar ints. */
bool matches_const_scalar_int_p = false;
bool matches_other_p = false;
for (int i = 0; i < NUM_RTX_CODE; ++i)
if (p->codes[i])
switch (i)
{
case CONST_INT:
case CONST_WIDE_INT:
/* Special handling for (VOIDmode) LABEL_REFs. */
case LABEL_REF:
matches_const_scalar_int_p = true;
break;
case CONST_DOUBLE:
if (!TARGET_SUPPORTS_WIDE_INT)
matches_const_scalar_int_p = true;
matches_other_p = true;
break;
default:
matches_other_p = true;
break;
}
/* There's no need for a mode check if the predicate only accepts
constant integers. The code checks in the predicate are enough
to establish that the mode is VOIDmode.
Note that the predicate itself should check whether a scalar
integer is in range of the given mode. */
if (!matches_other_p)
return;
mark_mode_tests (p->exp);
/* If the whole expression already tests the mode, we're done. */
if (!NO_MODE_TEST (p->exp))
return;
match_test_exp = rtx_alloc (MATCH_TEST);
if (matches_const_scalar_int_p)
XSTR (match_test_exp, 0) = ("mode == VOIDmode || GET_MODE (op) == mode"
" || GET_MODE (op) == VOIDmode");
else
XSTR (match_test_exp, 0) = "mode == VOIDmode || GET_MODE (op) == mode";
and_exp = rtx_alloc (AND);
XEXP (and_exp, 1) = match_test_exp;
/* It is always correct to rewrite p->exp as
(and (...) (match_test "mode == VOIDmode || GET_MODE (op) == mode"))
but there are a couple forms where we can do better. If the
top-level pattern is an IOR, and one of the two branches does test
the mode, we can wrap just the branch that doesn't. Likewise, if
we have an IF_THEN_ELSE, and one side of it tests the mode, we can
wrap just the side that doesn't. And, of course, we can repeat this
descent as many times as it works. */
pos = &p->exp;
for (;;)
{
rtx subexp = *pos;
switch (GET_CODE (subexp))
{
case AND:
/* The switch code generation in write_predicate_stmts prefers
rtx code tests to be at the top of the expression tree. So
push this AND down into the second operand of an existing
AND expression. */
if (generate_switch_p (XEXP (subexp, 0)))
pos = &XEXP (subexp, 1);
goto break_loop;
case IOR:
{
int test0 = NO_MODE_TEST (XEXP (subexp, 0));
int test1 = NO_MODE_TEST (XEXP (subexp, 1));
gcc_assert (test0 || test1);
if (test0 && test1)
goto break_loop;
pos = test0 ? &XEXP (subexp, 0) : &XEXP (subexp, 1);
}
break;
case IF_THEN_ELSE:
{
int test0 = NO_MODE_TEST (XEXP (subexp, 0));
int test1 = NO_MODE_TEST (XEXP (subexp, 1));
int test2 = NO_MODE_TEST (XEXP (subexp, 2));
gcc_assert ((test0 && test1) || test2);
if (test0 && test1 && test2)
goto break_loop;
if (test0 && test1)
/* Must put it on the dependent clause, not the
controlling expression, or we change the meaning of
the test. */
pos = &XEXP (subexp, 1);
else
pos = &XEXP (subexp, 2);
}
break;
default:
goto break_loop;
}
}
break_loop:
XEXP (and_exp, 0) = *pos;
*pos = and_exp;
}
/* PATH is a string describing a path from the root of an RTL
expression to an inner subexpression to be tested. Output
code which computes the subexpression from the variable
holding the root of the expression. */
static void
write_extract_subexp (const char *path)
{
int len = strlen (path);
int i;
/* We first write out the operations (XEXP or XVECEXP) in reverse
order, then write "op", 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 ("op", 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 ();
}
}
/* CODES is a list of RTX codes. Write out an expression which
determines whether the operand has one of those codes. */
static void
write_match_code (const char *path, const char *codes)
{
const char *code;
while ((code = scan_comma_elt (&codes)) != 0)
{
fputs ("GET_CODE (", stdout);
write_extract_subexp (path);
fputs (") == ", stdout);
while (code < codes)
{
putchar (TOUPPER (*code));
code++;
}
if (*codes == ',')
fputs (" || ", stdout);
}
}
/* EXP is an RTL (sub)expression for a predicate. Recursively
descend the expression and write out an equivalent C expression. */
static void
write_predicate_expr (rtx exp)
{
switch (GET_CODE (exp))
{
case AND:
putchar ('(');
write_predicate_expr (XEXP (exp, 0));
fputs (") && (", stdout);
write_predicate_expr (XEXP (exp, 1));
putchar (')');
break;
case IOR:
putchar ('(');
write_predicate_expr (XEXP (exp, 0));
fputs (") || (", stdout);
write_predicate_expr (XEXP (exp, 1));
putchar (')');
break;
case NOT:
fputs ("!(", stdout);
write_predicate_expr (XEXP (exp, 0));
putchar (')');
break;
case IF_THEN_ELSE:
putchar ('(');
write_predicate_expr (XEXP (exp, 0));
fputs (") ? (", stdout);
write_predicate_expr (XEXP (exp, 1));
fputs (") : (", stdout);
write_predicate_expr (XEXP (exp, 2));
putchar (')');
break;
case MATCH_OPERAND:
if (GET_MODE (exp) == VOIDmode)
printf ("%s (op, mode)", XSTR (exp, 1));
else
printf ("%s (op, %smode)", XSTR (exp, 1), mode_name[GET_MODE (exp)]);
break;
case MATCH_CODE:
write_match_code (XSTR (exp, 1), XSTR (exp, 0));
break;
case MATCH_TEST:
rtx_reader_ptr->print_c_condition (XSTR (exp, 0));
break;
default:
gcc_unreachable ();
}
}
/* Write the MATCH_CODE expression EXP as a switch statement. */
static void
write_match_code_switch (rtx exp)
{
const char *codes = XSTR (exp, 0);
const char *path = XSTR (exp, 1);
const char *code;
fputs (" switch (GET_CODE (", stdout);
write_extract_subexp (path);
fputs ("))\n {\n", stdout);
while ((code = scan_comma_elt (&codes)) != 0)
{
fputs (" case ", stdout);
while (code < codes)
{
putchar (TOUPPER (*code));
code++;
}
fputs (":\n", stdout);
}
}
/* Given a predicate expression EXP, write out a sequence of stmts
to evaluate it. This is similar to write_predicate_expr but can
generate efficient switch statements. */
static void
write_predicate_stmts (rtx exp)
{
switch (GET_CODE (exp))
{
case MATCH_CODE:
if (generate_switch_p (exp))
{
write_match_code_switch (exp);
puts (" return true;\n"
" default:\n"
" break;\n"
" }\n"
" return false;");
return;
}
break;
case AND:
if (generate_switch_p (XEXP (exp, 0)))
{
write_match_code_switch (XEXP (exp, 0));
puts (" break;\n"
" default:\n"
" return false;\n"
" }");
exp = XEXP (exp, 1);
}
break;
case IOR:
if (generate_switch_p (XEXP (exp, 0)))
{
write_match_code_switch (XEXP (exp, 0));
puts (" return true;\n"
" default:\n"
" break;\n"
" }");
exp = XEXP (exp, 1);
}
break;
case NOT:
if (generate_switch_p (XEXP (exp, 0)))
{
write_match_code_switch (XEXP (exp, 0));
puts (" return false;\n"
" default:\n"
" break;\n"
" }\n"
" return true;");
return;
}
break;
default:
break;
}
fputs (" return ",stdout);
write_predicate_expr (exp);
fputs (";\n", stdout);
}
/* Given a predicate, write out a complete C function to compute it. */
static void
write_one_predicate_function (struct pred_data *p)
{
if (!p->exp)
return;
write_predicate_subfunction (p);
add_mode_tests (p);
/* A normal predicate can legitimately not look at machine_mode
if it accepts only CONST_INTs and/or CONST_WIDE_INT and/or CONST_DOUBLEs. */
printf ("int\n%s (rtx op, machine_mode mode ATTRIBUTE_UNUSED)\n{\n",
p->name);
write_predicate_stmts (p->exp);
fputs ("}\n\n", stdout);
}
/* Constraints fall into two categories: register constraints
(define_register_constraint), and others (define_constraint,
define_memory_constraint, define_special_memory_constraint,
define_address_constraint). We work out automatically which of the
various old-style macros they correspond to, and produce
appropriate code. They all go in the same hash table so we can
verify that there are no duplicate names. */
/* All data from one constraint definition. */
class constraint_data
{
public:
class constraint_data *next_this_letter;
class constraint_data *next_textual;
const char *name;
const char *c_name; /* same as .name unless mangling is necessary */
file_location loc; /* location of definition */
size_t namelen;
const char *regclass; /* for register constraints */
rtx exp; /* for other constraints */
unsigned int is_register : 1;
unsigned int is_const_int : 1;
unsigned int is_const_dbl : 1;
unsigned int is_extra : 1;
unsigned int is_memory : 1;
unsigned int is_special_memory: 1;
unsigned int is_address : 1;
unsigned int maybe_allows_reg : 1;
unsigned int maybe_allows_mem : 1;
};
/* Overview of all constraints beginning with a given letter. */
static class constraint_data *
constraints_by_letter_table[1<<CHAR_BIT];
/* For looking up all the constraints in the order that they appeared
in the machine description. */
static class constraint_data *first_constraint;
static class constraint_data **last_constraint_ptr = &first_constraint;
#define FOR_ALL_CONSTRAINTS(iter_) \
for (iter_ = first_constraint; iter_; iter_ = iter_->next_textual)
/* Contraint letters that have a special meaning and that cannot be used
in define*_constraints. */
static const char generic_constraint_letters[] = "g";
/* Machine-independent code expects that constraints with these
(initial) letters will allow only (a subset of all) CONST_INTs. */
static const char const_int_constraints[] = "IJKLMNOP";
/* Machine-independent code expects that constraints with these
(initial) letters will allow only (a subset of all) CONST_DOUBLEs. */
static const char const_dbl_constraints[] = "GH";
/* Summary data used to decide whether to output various functions and
macro definitions. */
static unsigned int constraint_max_namelen;
static bool have_register_constraints;
static bool have_memory_constraints;
static bool have_special_memory_constraints;
static bool have_address_constraints;
static bool have_extra_constraints;
static bool have_const_int_constraints;
static unsigned int num_constraints;
static const constraint_data **enum_order;
static unsigned int register_start, register_end;
static unsigned int satisfied_start;
static unsigned int const_int_start, const_int_end;
static unsigned int memory_start, memory_end;
static unsigned int special_memory_start, special_memory_end;
static unsigned int address_start, address_end;
static unsigned int maybe_allows_none_start, maybe_allows_none_end;
static unsigned int maybe_allows_reg_start, maybe_allows_reg_end;
static unsigned int maybe_allows_mem_start, maybe_allows_mem_end;
/* Convert NAME, which contains angle brackets and/or underscores, to
a string that can be used as part of a C identifier. The string
comes from the rtl_obstack. */
static const char *
mangle (const char *name)
{
for (; *name; name++)
switch (*name)
{
case '_': obstack_grow (rtl_obstack, "__", 2); break;
case '<': obstack_grow (rtl_obstack, "_l", 2); break;
case '>': obstack_grow (rtl_obstack, "_g", 2); break;
default: obstack_1grow (rtl_obstack, *name); break;
}
obstack_1grow (rtl_obstack, '\0');
return XOBFINISH (rtl_obstack, const char *);
}
/* Add one constraint, of any sort, to the tables. NAME is its name;
REGCLASS is the register class, if any; EXP is the expression to
test, if any; IS_MEMORY, IS_SPECIAL_MEMORY and IS_ADDRESS indicate
memory, special memory, and address constraints, respectively; LOC
is the .md file location.
Not all combinations of arguments are valid; most importantly,
REGCLASS is mutually exclusive with EXP, and
IS_MEMORY/IS_SPECIAL_MEMORY/IS_ADDRESS are only meaningful for
constraints with EXP.
This function enforces all syntactic and semantic rules about what
constraints can be defined. */
static void
add_constraint (const char *name, const char *regclass,
rtx exp, bool is_memory, bool is_special_memory,
bool is_address, file_location loc)
{
class constraint_data *c, **iter, **slot;
const char *p;
bool need_mangled_name = false;
bool is_const_int;
bool is_const_dbl;
size_t namelen;
if (strcmp (name, "TARGET_MEM_CONSTRAINT") == 0)
name = general_mem;
if (exp && validate_exp (exp, name, loc))
return;
for (p = name; *p; p++)
if (!ISALNUM (*p))
{
if (*p == '<' || *p == '>' || *p == '_')
need_mangled_name = true;
else
{
error_at (loc, "constraint name '%s' must be composed of letters,"
" digits, underscores, and angle brackets", name);
return;
}
}
if (strchr (generic_constraint_letters, name[0]))
{
if (name[1] == '\0')
error_at (loc, "constraint letter '%s' cannot be "
"redefined by the machine description", name);
else
error_at (loc, "constraint name '%s' cannot be defined by the machine"
" description, as it begins with '%c'", name, name[0]);
return;
}
namelen = strlen (name);
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_at (loc, "redefinition of constraint '%s'", name);
message_at ((*iter)->loc, "previous definition is here");
return;
}
else if (!strncmp ((*iter)->name, name, (*iter)->namelen))
{
error_at (loc, "defining constraint '%s' here", name);
message_at ((*iter)->loc, "renders constraint '%s' "
"(defined here) a prefix", (*iter)->name);
return;
}
else if (!strncmp ((*iter)->name, name, namelen))
{
error_at (loc, "constraint '%s' is a prefix", name);
message_at ((*iter)->loc, "of constraint '%s' (defined here)",
(*iter)->name);
return;
}
}
is_const_int = strchr (const_int_constraints, name[0]) != 0;
is_const_dbl = strchr (const_dbl_constraints, name[0]) != 0;
if (is_const_int || is_const_dbl)
{
enum rtx_code appropriate_code
= is_const_int ? CONST_INT : CONST_DOUBLE;
/* Consider relaxing this requirement in the future. */
if (regclass
|| GET_CODE (exp) != AND
|| GET_CODE (XEXP (exp, 0)) != MATCH_CODE
|| strcmp (XSTR (XEXP (exp, 0), 0),
GET_RTX_NAME (appropriate_code)))
{
if (name[1] == '\0')
error_at (loc, "constraint letter '%c' is reserved "
"for %s constraints", name[0],
GET_RTX_NAME (appropriate_code));
else
error_at (loc, "constraint names beginning with '%c' "
"(%s) are reserved for %s constraints",
name[0], name, GET_RTX_NAME (appropriate_code));
return;
}
if (is_memory)
{
if (name[1] == '\0')
error_at (loc, "constraint letter '%c' cannot be a "
"memory constraint", name[0]);
else
error_at (loc, "constraint name '%s' begins with '%c', "
"and therefore cannot be a memory constraint",
name, name[0]);
return;
}
else if (is_special_memory)
{
if (name[1] == '\0')
error_at (loc, "constraint letter '%c' cannot be a "
"special memory constraint", name[0]);
else
error_at (loc, "constraint name '%s' begins with '%c', "
"and therefore cannot be a special memory constraint",
name, name[0]);
return;
}
else if (is_address)
{
if (name[1] == '\0')
error_at (loc, "constraint letter '%c' cannot be an "
"address constraint", name[0]);
else
error_at (loc, "constraint name '%s' begins with '%c', "
"and therefore cannot be an address constraint",
name, name[0]);
return;
}
}
c = XOBNEW (rtl_obstack, class constraint_data);
c->name = name;
c->c_name = need_mangled_name ? mangle (name) : name;
c->loc = loc;
c->namelen = namelen;
c->regclass = regclass;
c->exp = exp;
c->is_register = regclass != 0;
c->is_const_int = is_const_int;
c->is_const_dbl = is_const_dbl;
c->is_extra = !(regclass || is_const_int || is_const_dbl);
c->is_memory = is_memory;
c->is_special_memory = is_special_memory;
c->is_address = is_address;
c->maybe_allows_reg = true;
c->maybe_allows_mem = true;
if (exp)
{
char codes[NUM_RTX_CODE];
compute_test_codes (exp, loc, codes);
if (!codes[REG] && !codes[SUBREG])
c->maybe_allows_reg = false;
if (!codes[MEM])
c->maybe_allows_mem = false;
}
c->next_this_letter = *slot;
*slot = c;
/* Insert this constraint in the list of all constraints in textual
order. */
c->next_textual = 0;
*last_constraint_ptr = c;
last_constraint_ptr = &c->next_textual;
constraint_max_namelen = MAX (constraint_max_namelen, strlen (name));
have_register_constraints |= c->is_register;
have_const_int_constraints |= c->is_const_int;
have_extra_constraints |= c->is_extra;
have_memory_constraints |= c->is_memory;
have_special_memory_constraints |= c->is_special_memory;
have_address_constraints |= c->is_address;
num_constraints += 1;
}
/* Process a DEFINE_CONSTRAINT, DEFINE_MEMORY_CONSTRAINT,
DEFINE_SPECIAL_MEMORY_CONSTRAINT, or DEFINE_ADDRESS_CONSTRAINT
expression, C. */
static void
process_define_constraint (md_rtx_info *info)
{
add_constraint (XSTR (info->def, 0), 0, XEXP (info->def, 2),
GET_CODE (info->def) == DEFINE_MEMORY_CONSTRAINT,
GET_CODE (info->def) == DEFINE_SPECIAL_MEMORY_CONSTRAINT,
GET_CODE (info->def) == DEFINE_ADDRESS_CONSTRAINT,
info->loc);
}
/* Process a DEFINE_REGISTER_CONSTRAINT expression, C. */
static void
process_define_register_constraint (md_rtx_info *info)
{
add_constraint (XSTR (info->def, 0), XSTR (info->def, 1),
0, false, false, false, info->loc);
}
/* Put the constraints into enum order. We want to keep constraints
of the same type together so that query functions can be simple
range checks. */
static void
choose_enum_order (void)
{
class constraint_data *c;
enum_order = XNEWVEC (const constraint_data *, num_constraints);
unsigned int next = 0;
register_start = next;
FOR_ALL_CONSTRAINTS (c)
if (c->is_register)
enum_order[next++] = c;
register_end = next;
satisfied_start = next;
const_int_start = next;
FOR_ALL_CONSTRAINTS (c)
if (c->is_const_int)
enum_order[next++] = c;
const_int_end = next;