gcc/rtl-tests.c

   1 /* Unit tests for RTL-handling.
   2    Copyright (C) 2015-2021 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tm.h"
  24 #include "opts.h"
  25 #include "hash-set.h"
  26 #include "fixed-value.h"
  27 #include "alias.h"
  28 #include "flags.h"
  29 #include "symtab.h"
  30 #include "tree-core.h"
  31 #include "stor-layout.h"
  32 #include "tree.h"
  33 #include "stringpool.h"
  34 #include "stor-layout.h"
  35 #include "rtl.h"
  36 #include "pretty-print.h"
  37 #include "cfgbuild.h"
  38 #include "print-rtl.h"
  39 #include "selftest.h"
  40 #include "selftest-rtl.h"
  41 #include "function.h"
  42 #include "memmodel.h"
  43 #include "emit-rtl.h"
  44
  45 #if CHECKING_P
  46
  47 namespace selftest {
  48
  49 /* Verify that PAT is printed as EXPECTED.  Helper function for
  50    selftests.  */
  51
  52 static void
  53 verify_print_pattern (const char *expected, rtx pat)
  54 {
  55   pretty_printer pp;
  56   print_pattern (&pp, pat, 1);
  57   ASSERT_STREQ (expected, pp_formatted_text (&pp));
  58 }
  59
  60 /* Verify that X is dumped as EXPECTED_DUMP, using compact mode.
  61    Use LOC as the effective location when reporting errors.  */
  62
  63 void
  64 assert_rtl_dump_eq (const location &loc, const char *expected_dump, rtx x,
  65                     rtx_reuse_manager *reuse_manager)
  66 {
  67   named_temp_file tmp_out (".rtl");
  68   FILE *outfile = fopen (tmp_out.get_filename (), "w");
  69   rtx_writer w (outfile, 0, false, true, reuse_manager);
  70   w.print_rtl (x);
  71   fclose (outfile);
  72
  73   char *dump = read_file (SELFTEST_LOCATION, tmp_out.get_filename ());
  74   ASSERT_STREQ_AT (loc, expected_dump, dump);
  75   free (dump);
  76 }
  77
  78 /* Verify that regs are dumped as expected (in compact mode).  */
  79
  80 static void
  81 test_dumping_regs ()
  82 {
  83   /* Dumps of hard regs contain a target-specific name, so we don't test
  84      it here; this can be tested in target-specific selftests.  */
  85
  86   /* Test dumping of virtual regs.  The various virtual regs are inited as
  87      Pmode, so this is target-specific.  The tests below assume DImode, so
  88      only run the tests for targets where Pmode is DImode.  */
  89   if (Pmode == DImode)
  90     {
  91       ASSERT_RTL_DUMP_EQ ("(reg:DI virtual-incoming-args)",
  92                           virtual_incoming_args_rtx);
  93       ASSERT_RTL_DUMP_EQ ("(reg:DI virtual-stack-vars)",
  94                           virtual_stack_vars_rtx);
  95       ASSERT_RTL_DUMP_EQ ("(reg:DI virtual-stack-dynamic)",
  96                           virtual_stack_dynamic_rtx);
  97       ASSERT_RTL_DUMP_EQ ("(reg:DI virtual-outgoing-args)",
  98                           virtual_outgoing_args_rtx);
  99       ASSERT_RTL_DUMP_EQ ("(reg:DI virtual-cfa)",
 100                           virtual_cfa_rtx);
 101       ASSERT_RTL_DUMP_EQ ("(reg:DI virtual-preferred-stack-boundary)",
 102                           virtual_preferred_stack_boundary_rtx);
 103     }
 104
 105   /* Test dumping of non-virtual pseudos.  */
 106   ASSERT_RTL_DUMP_EQ ("(reg:SI <0>)",
 107     gen_raw_REG (SImode, LAST_VIRTUAL_REGISTER + 1));
 108   ASSERT_RTL_DUMP_EQ ("(reg:SI <1>)",
 109     gen_raw_REG (SImode, LAST_VIRTUAL_REGISTER + 2));
 110 }
 111
 112 /* Verify that insns are dumped as expected (in compact mode).  */
 113
 114 static void
 115 test_dumping_insns ()
 116 {
 117   /* Barriers.  */
 118   rtx_barrier *barrier = as_a <rtx_barrier *> (rtx_alloc (BARRIER));
 119   SET_NEXT_INSN (barrier) = NULL;
 120   ASSERT_RTL_DUMP_EQ ("(cbarrier 0)\n", barrier);
 121
 122   /* Labels.  */
 123   rtx_insn *label = gen_label_rtx ();
 124   CODE_LABEL_NUMBER (label) = 42;
 125   ASSERT_RTL_DUMP_EQ ("(clabel 0 42)\n", label);
 126
 127   LABEL_NAME (label)= "some_label";
 128   ASSERT_RTL_DUMP_EQ ("(clabel 0 42 (\"some_label\"))\n", label);
 129 }
 130
 131 /* Manually exercise the rtx_reuse_manager code.  */
 132
 133 static void
 134 test_dumping_rtx_reuse ()
 135 {
 136   rtx_reuse_manager r;
 137
 138   rtx x = rtx_alloc (SCRATCH);
 139   rtx y = rtx_alloc (SCRATCH);
 140   rtx z = rtx_alloc (SCRATCH);
 141
 142   /* x and y will be seen more than once.  */
 143   r.preprocess (x);
 144   r.preprocess (x);
 145   r.preprocess (y);
 146   r.preprocess (y);
 147
 148   /* z will be only seen once.  */
 149   r.preprocess (z);
 150
 151   /* Verify that x and y have been assigned reuse IDs.  */
 152   int reuse_id_for_x;
 153   ASSERT_TRUE (r.has_reuse_id (x, &reuse_id_for_x));
 154   ASSERT_EQ (0, reuse_id_for_x);
 155
 156   int reuse_id_for_y;
 157   ASSERT_TRUE (r.has_reuse_id (y, &reuse_id_for_y));
 158   ASSERT_EQ (1, reuse_id_for_y);
 159
 160   /* z is only seen once and thus shouldn't get a reuse ID.  */
 161   ASSERT_FALSE (r.has_reuse_id (z, NULL));
 162
 163   /* The first dumps of x and y should be prefixed by reuse ID;
 164      all subsequent dumps of them should show up as "reuse_rtx".  */
 165   ASSERT_RTL_DUMP_EQ_WITH_REUSE ("(0|scratch)", x, &r);
 166   ASSERT_RTL_DUMP_EQ_WITH_REUSE ("(reuse_rtx 0)", x, &r);
 167   ASSERT_RTL_DUMP_EQ_WITH_REUSE ("(reuse_rtx 0)", x, &r);
 168
 169   ASSERT_RTL_DUMP_EQ_WITH_REUSE ("(1|scratch)", y, &r);
 170   ASSERT_RTL_DUMP_EQ_WITH_REUSE ("(reuse_rtx 1)", y, &r);
 171   ASSERT_RTL_DUMP_EQ_WITH_REUSE ("(reuse_rtx 1)", y, &r);
 172
 173   /* z only appears once and thus shouldn't be prefixed with a
 174      reuse ID.  */
 175   ASSERT_RTL_DUMP_EQ_WITH_REUSE ("(scratch)", z, &r);
 176 }
 177
 178 /* Unit testing of "single_set".  */
 179
 180 static void
 181 test_single_set ()
 182 {
 183   /* A label is not a SET.  */
 184   ASSERT_EQ (NULL_RTX, single_set (gen_label_rtx ()));
 185
 186   /* An unconditional jump insn is a single SET.  */
 187   rtx set_pc = gen_rtx_SET (pc_rtx,
 188                             gen_rtx_LABEL_REF (VOIDmode,
 189                                                gen_label_rtx ()));
 190   rtx_insn *jump_insn = emit_jump_insn (set_pc);
 191   ASSERT_EQ (set_pc, single_set (jump_insn));
 192
 193   /* etc */
 194 }
 195
 196 /* Construct an unconditional jump to a label, and verify that
 197    various properties of it are sane.  */
 198
 199 static void
 200 test_uncond_jump ()
 201 {
 202   set_new_first_and_last_insn (NULL, NULL);
 203   rtx_insn *label = gen_label_rtx ();
 204   rtx jump_pat = gen_rtx_SET (pc_rtx,
 205                               gen_rtx_LABEL_REF (VOIDmode,
 206                                                  label));
 207   ASSERT_EQ (SET, jump_pat->code);
 208   ASSERT_EQ (LABEL_REF, SET_SRC (jump_pat)->code);
 209   ASSERT_EQ (label, label_ref_label (SET_SRC (jump_pat)));
 210   ASSERT_EQ (PC, SET_DEST (jump_pat)->code);
 211
 212   verify_print_pattern ("pc=L0", jump_pat);
 213
 214   ASSERT_RTL_DUMP_EQ ("(set (pc)\n"
 215                       "    (label_ref 0))",
 216                       jump_pat);
 217
 218   rtx_insn *jump_insn = emit_jump_insn (jump_pat);
 219   ASSERT_FALSE (any_condjump_p (jump_insn));
 220   ASSERT_TRUE (any_uncondjump_p (jump_insn));
 221   ASSERT_TRUE (pc_set (jump_insn));
 222   ASSERT_TRUE (simplejump_p (jump_insn));
 223   ASSERT_TRUE (onlyjump_p (jump_insn));
 224   ASSERT_TRUE (control_flow_insn_p (jump_insn));
 225
 226   ASSERT_RTL_DUMP_EQ ("(cjump_insn 1 (set (pc)\n"
 227                       "        (label_ref 0)))\n",
 228                       jump_insn);
 229 }
 230
 231 template<unsigned int N>
 232 struct const_poly_int_tests
 233 {
 234   static void run ();
 235 };
 236
 237 template<>
 238 struct const_poly_int_tests<1>
 239 {
 240   static void run () {}
 241 };
 242
 243 /* Test various CONST_POLY_INT properties.  */
 244
 245 template<unsigned int N>
 246 void
 247 const_poly_int_tests<N>::run ()
 248 {
 249   rtx x1 = gen_int_mode (poly_int64 (1, 1), QImode);
 250   rtx x255 = gen_int_mode (poly_int64 (1, 255), QImode);
 251
 252   /* Test that constants are unique.  */
 253   ASSERT_EQ (x1, gen_int_mode (poly_int64 (1, 1), QImode));
 254   ASSERT_NE (x1, gen_int_mode (poly_int64 (1, 1), HImode));
 255   ASSERT_NE (x1, x255);
 256
 257   /* Test const_poly_int_value.  */
 258   ASSERT_KNOWN_EQ (const_poly_int_value (x1), poly_int64 (1, 1));
 259   ASSERT_KNOWN_EQ (const_poly_int_value (x255), poly_int64 (1, -1));
 260
 261   /* Test rtx_to_poly_int64.  */
 262   ASSERT_KNOWN_EQ (rtx_to_poly_int64 (x1), poly_int64 (1, 1));
 263   ASSERT_KNOWN_EQ (rtx_to_poly_int64 (x255), poly_int64 (1, -1));
 264   ASSERT_MAYBE_NE (rtx_to_poly_int64 (x255), poly_int64 (1, 255));
 265
 266   /* Test plus_constant of a symbol.  */
 267   rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "foo");
 268   rtx offset1 = gen_int_mode (poly_int64 (9, 11), Pmode);
 269   rtx sum1 = gen_rtx_CONST (Pmode, gen_rtx_PLUS (Pmode, symbol, offset1));
 270   ASSERT_RTX_EQ (plus_constant (Pmode, symbol, poly_int64 (9, 11)), sum1);
 271
 272   /* Test plus_constant of a CONST.  */
 273   rtx offset2 = gen_int_mode (poly_int64 (12, 20), Pmode);
 274   rtx sum2 = gen_rtx_CONST (Pmode, gen_rtx_PLUS (Pmode, symbol, offset2));
 275   ASSERT_RTX_EQ (plus_constant (Pmode, sum1, poly_int64 (3, 9)), sum2);
 276
 277   /* Test a cancelling plus_constant.  */
 278   ASSERT_EQ (plus_constant (Pmode, sum2, poly_int64 (-12, -20)), symbol);
 279
 280   /* Test plus_constant on integer constants.  */
 281   ASSERT_EQ (plus_constant (QImode, const1_rtx, poly_int64 (4, -2)),
 282              gen_int_mode (poly_int64 (5, -2), QImode));
 283   ASSERT_EQ (plus_constant (QImode, x1, poly_int64 (4, -2)),
 284              gen_int_mode (poly_int64 (5, -1), QImode));
 285 }
 286
 287 /* Check dumping of repeated RTL vectors.  */
 288
 289 static void
 290 test_dumping_repeat ()
 291 {
 292   rtx p = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (3));
 293   XVECEXP (p, 0, 0) = const0_rtx;
 294   XVECEXP (p, 0, 1) = const0_rtx;
 295   XVECEXP (p, 0, 2) = const0_rtx;
 296   ASSERT_RTL_DUMP_EQ ("(parallel [\n"
 297                       "        (const_int 0) repeated x3\n"
 298                       "    ])",
 299                       p);
 300
 301   XVECEXP (p, 0, 1) = const1_rtx;
 302   ASSERT_RTL_DUMP_EQ ("(parallel [\n"
 303                       "        (const_int 0)\n"
 304                       "        (const_int 1)\n"
 305                       "        (const_int 0)\n"
 306                       "    ])",
 307                       p);
 308 }
 309
 310 /* Run all of the selftests within this file.  */
 311
 312 void
 313 rtl_tests_c_tests ()
 314 {
 315   test_dumping_regs ();
 316   test_dumping_insns ();
 317   test_dumping_rtx_reuse ();
 318   test_single_set ();
 319   test_uncond_jump ();
 320   const_poly_int_tests<NUM_POLY_INT_COEFFS>::run ();
 321   test_dumping_repeat ();
 322
 323   /* Purge state.  */
 324   set_first_insn (NULL);
 325   set_last_insn (NULL);
 326 }
 327
 328 } // namespace selftest
 329 #endif /* #if CHECKING_P */