/usr/lib/gcc-cross/powerpc64-linux-gnu/7/plugin/include/rtl-iter.h is in gcc-7-plugin-dev-powerpc64-linux-gnu 7.3.0-16ubuntu3cross1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 | /* RTL iterators
Copyright (C) 2014-2017 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/>. */
/* This structure describes the subrtxes of an rtx as follows:
- if the rtx has no subrtxes, START and COUNT are both 0.
- if all the subrtxes of an rtx are stored in a contiguous block
of XEXPs ("e"s), START is the index of the first XEXP and COUNT
is the number of them.
- otherwise START is arbitrary and COUNT is UCHAR_MAX.
rtx_all_subrtx_bounds applies to all codes. rtx_nonconst_subrtx_bounds
is like rtx_all_subrtx_bounds except that all constant rtxes are treated
as having no subrtxes. */
struct rtx_subrtx_bound_info {
unsigned char start;
unsigned char count;
};
extern rtx_subrtx_bound_info rtx_all_subrtx_bounds[];
extern rtx_subrtx_bound_info rtx_nonconst_subrtx_bounds[];
/* Return true if CODE has no subrtxes. */
static inline bool
leaf_code_p (enum rtx_code code)
{
return rtx_all_subrtx_bounds[code].count == 0;
}
/* Used to iterate over subrtxes of an rtx. T abstracts the type of
access. */
template <typename T>
class generic_subrtx_iterator
{
static const size_t LOCAL_ELEMS = 16;
typedef typename T::value_type value_type;
typedef typename T::rtx_type rtx_type;
typedef typename T::rtunion_type rtunion_type;
public:
struct array_type
{
array_type ();
~array_type ();
value_type stack[LOCAL_ELEMS];
vec <value_type, va_heap, vl_embed> *heap;
};
generic_subrtx_iterator (array_type &, value_type,
const rtx_subrtx_bound_info *);
value_type operator * () const;
bool at_end () const;
void next ();
void skip_subrtxes ();
void substitute (value_type);
private:
/* The bounds to use for iterating over subrtxes. */
const rtx_subrtx_bound_info *m_bounds;
/* The storage used for the worklist. */
array_type &m_array;
/* The current rtx. */
value_type m_current;
/* The base of the current worklist. */
value_type *m_base;
/* The number of subrtxes in M_BASE. */
size_t m_end;
/* The following booleans shouldn't end up in registers or memory
but just direct control flow. */
/* True if the iteration is over. */
bool m_done;
/* True if we should skip the subrtxes of M_CURRENT. */
bool m_skip;
/* True if M_CURRENT has been replaced with a different rtx. */
bool m_substitute;
static void free_array (array_type &);
static size_t add_subrtxes_to_queue (array_type &, value_type *, size_t,
rtx_type);
static value_type *add_single_to_queue (array_type &, value_type *, size_t,
value_type);
};
template <typename T>
inline generic_subrtx_iterator <T>::array_type::array_type () : heap (0) {}
template <typename T>
inline generic_subrtx_iterator <T>::array_type::~array_type ()
{
if (__builtin_expect (heap != 0, false))
free_array (*this);
}
/* Iterate over X and its subrtxes, in arbitrary order. Use ARRAY to
store the worklist. We use an external array in order to avoid
capturing the fields of this structure when taking the address of
the array. Use BOUNDS to find the bounds of simple "e"-string codes. */
template <typename T>
inline generic_subrtx_iterator <T>::
generic_subrtx_iterator (array_type &array, value_type x,
const rtx_subrtx_bound_info *bounds)
: m_bounds (bounds),
m_array (array),
m_current (x),
m_base (m_array.stack),
m_end (0),
m_done (false),
m_skip (false),
m_substitute (false)
{
}
/* Return the current subrtx. */
template <typename T>
inline typename T::value_type
generic_subrtx_iterator <T>::operator * () const
{
return m_current;
}
/* Return true if the iteration has finished. */
template <typename T>
inline bool
generic_subrtx_iterator <T>::at_end () const
{
return m_done;
}
/* Move on to the next subrtx. */
template <typename T>
inline void
generic_subrtx_iterator <T>::next ()
{
if (m_substitute)
{
m_substitute = false;
m_skip = false;
return;
}
if (!m_skip)
{
/* Add the subrtxes of M_CURRENT. */
rtx_type x = T::get_rtx (m_current);
if (__builtin_expect (x != 0, true))
{
enum rtx_code code = GET_CODE (x);
ssize_t count = m_bounds[code].count;
if (count > 0)
{
/* Handle the simple case of a single "e" block that is known
to fit into the current array. */
if (__builtin_expect (m_end + count <= LOCAL_ELEMS + 1, true))
{
/* Set M_CURRENT to the first subrtx and queue the rest. */
ssize_t start = m_bounds[code].start;
rtunion_type *src = &x->u.fld[start];
if (__builtin_expect (count > 2, false))
m_base[m_end++] = T::get_value (src[2].rt_rtx);
if (count > 1)
m_base[m_end++] = T::get_value (src[1].rt_rtx);
m_current = T::get_value (src[0].rt_rtx);
return;
}
/* Handle cases which aren't simple "e" sequences or where
the sequence might overrun M_BASE. */
count = add_subrtxes_to_queue (m_array, m_base, m_end, x);
if (count > 0)
{
m_end += count;
if (m_end > LOCAL_ELEMS)
m_base = m_array.heap->address ();
m_current = m_base[--m_end];
return;
}
}
}
}
else
m_skip = false;
if (m_end == 0)
m_done = true;
else
m_current = m_base[--m_end];
}
/* Skip the subrtxes of the current rtx. */
template <typename T>
inline void
generic_subrtx_iterator <T>::skip_subrtxes ()
{
m_skip = true;
}
/* Ignore the subrtxes of the current rtx and look at X instead. */
template <typename T>
inline void
generic_subrtx_iterator <T>::substitute (value_type x)
{
m_substitute = true;
m_current = x;
}
/* Iterators for const_rtx. */
struct const_rtx_accessor
{
typedef const_rtx value_type;
typedef const_rtx rtx_type;
typedef const rtunion rtunion_type;
static rtx_type get_rtx (value_type x) { return x; }
static value_type get_value (rtx_type x) { return x; }
};
typedef generic_subrtx_iterator <const_rtx_accessor> subrtx_iterator;
/* Iterators for non-constant rtx. */
struct rtx_var_accessor
{
typedef rtx value_type;
typedef rtx rtx_type;
typedef rtunion rtunion_type;
static rtx_type get_rtx (value_type x) { return x; }
static value_type get_value (rtx_type x) { return x; }
};
typedef generic_subrtx_iterator <rtx_var_accessor> subrtx_var_iterator;
/* Iterators for rtx *. */
struct rtx_ptr_accessor
{
typedef rtx *value_type;
typedef rtx rtx_type;
typedef rtunion rtunion_type;
static rtx_type get_rtx (value_type ptr) { return *ptr; }
static value_type get_value (rtx_type &x) { return &x; }
};
typedef generic_subrtx_iterator <rtx_ptr_accessor> subrtx_ptr_iterator;
#define ALL_BOUNDS rtx_all_subrtx_bounds
#define NONCONST_BOUNDS rtx_nonconst_subrtx_bounds
/* Use ITER to iterate over const_rtx X and its recursive subrtxes,
using subrtx_iterator::array ARRAY as the storage for the worklist.
ARRAY can be reused for multiple consecutive iterations but shouldn't
be shared by two concurrent iterations. TYPE is ALL if all subrtxes
are of interest or NONCONST if it is safe to ignore subrtxes of
constants. */
#define FOR_EACH_SUBRTX(ITER, ARRAY, X, TYPE) \
for (subrtx_iterator ITER (ARRAY, X, TYPE##_BOUNDS); !ITER.at_end (); \
ITER.next ())
/* Like FOR_EACH_SUBRTX, but iterate over subrtxes of an rtx X. */
#define FOR_EACH_SUBRTX_VAR(ITER, ARRAY, X, TYPE) \
for (subrtx_var_iterator ITER (ARRAY, X, TYPE##_BOUNDS); !ITER.at_end (); \
ITER.next ())
/* Like FOR_EACH_SUBRTX, but iterate over subrtx pointers of rtx pointer X.
For example, if X is &PATTERN (insn) and the pattern is a SET, iterate
over &PATTERN (insn), &SET_DEST (PATTERN (insn)), etc. */
#define FOR_EACH_SUBRTX_PTR(ITER, ARRAY, X, TYPE) \
for (subrtx_ptr_iterator ITER (ARRAY, X, TYPE##_BOUNDS); !ITER.at_end (); \
ITER.next ())
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