gcc/basic-block.h

   1 /* Define control and data flow tables, and regsets.
   2    Copyright (C) 1987, 1997 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include "bitmap.h"
  23
  24 typedef bitmap regset;          /* Head of register set linked list.  */
  25
  26 /* Clear a register set by freeing up the linked list.  */
  27 #define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD)
  28
  29 /* Copy a register set to another register set.  */
  30 #define COPY_REG_SET(TO, FROM) bitmap_copy (TO, FROM)
  31
  32 /* `and' a register set with a second register set.  */
  33 #define AND_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_AND)
  34
  35 /* `and' the complement of a register set with a register set.  */
  36 #define AND_COMPL_REG_SET(TO, FROM) \
  37   bitmap_operation (TO, TO, FROM, BITMAP_AND_COMPL)
  38
  39 /* Inclusive or a register set with a second register set.  */
  40 #define IOR_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_IOR)
  41
  42 /* Or into TO the register set FROM1 `and'ed with the complement of FROM2.  */
  43 #define IOR_AND_COMPL_REG_SET(TO, FROM1, FROM2) \
  44   bitmap_ior_and_compl (TO, FROM1, FROM2)
  45
  46 /* Clear a single register in a register set.  */
  47 #define CLEAR_REGNO_REG_SET(HEAD, REG) bitmap_clear_bit (HEAD, REG)
  48
  49 /* Set a single register in a register set.  */
  50 #define SET_REGNO_REG_SET(HEAD, REG) bitmap_set_bit (HEAD, REG)
  51
  52 /* Return true if a register is set in a register set.  */
  53 #define REGNO_REG_SET_P(TO, REG) bitmap_bit_p (TO, REG)
  54
  55 /* Copy the hard registers in a register set to the hard register set.  */
  56 #define REG_SET_TO_HARD_REG_SET(TO, FROM)                               \
  57 do {                                                                    \
  58   int i_;                                                               \
  59   CLEAR_HARD_REG_SET (TO);                                              \
  60   for (i_ = 0; i_ < FIRST_PSEUDO_REGISTER; i_++)                        \
  61     if (REGNO_REG_SET_P (FROM, i_))                                     \
  62       SET_HARD_REG_BIT (TO, i_);                                        \
  63 } while (0)
  64
  65 /* Loop over all registers in REGSET, starting with MIN, setting REGNUM to the
  66    register number and executing CODE for all registers that are set. */
  67 #define EXECUTE_IF_SET_IN_REG_SET(REGSET, MIN, REGNUM, CODE)            \
  68   EXECUTE_IF_SET_IN_BITMAP (REGSET, MIN, REGNUM, CODE)
  69
  70 /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
  71    REGNUM to the register number and executing CODE for all registers that are
  72    set in the first regset and not set in the second. */
  73 #define EXECUTE_IF_AND_COMPL_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
  74   EXECUTE_IF_AND_COMPL_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
  75
  76 /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
  77    REGNUM to the register number and executing CODE for all registers that are
  78    set in both regsets. */
  79 #define EXECUTE_IF_AND_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
  80   EXECUTE_IF_AND_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
  81
  82 /* Allocate a register set with oballoc.  */
  83 #define OBSTACK_ALLOC_REG_SET(OBSTACK) BITMAP_OBSTACK_ALLOC (OBSTACK)
  84
  85 /* Allocate a register set with alloca.  */
  86 #define ALLOCA_REG_SET() BITMAP_ALLOCA ()
  87
  88 /* Do any cleanup needed on a regset when it is no longer used.  */
  89 #define FREE_REG_SET(REGSET) BITMAP_FREE(REGSET)
  90
  91 /* Do any one-time initializations needed for regsets.  */
  92 #define INIT_ONCE_REG_SET() BITMAP_INIT_ONCE ()
  93
  94 /* Grow any tables needed when the number of registers is calculated
  95    or extended.  For the linked list allocation, nothing needs to
  96    be done, other than zero the statistics on the first allocation.  */
  97 #define MAX_REGNO_REG_SET(NUM_REGS, NEW_P, RENUMBER_P)
  98
  99 /* Number of basic blocks in the current function.  */
 100
 101 extern int n_basic_blocks;
 102
 103 /* Index by basic block number, get first insn in the block.  */
 104
 105 extern rtx *basic_block_head;
 106
 107 /* Index by basic block number, get last insn in the block.  */
 108
 109 extern rtx *basic_block_end;
 110
 111 /* Index by basic block number, get address of regset
 112    describing the registers live at the start of that block.  */
 113
 114 extern regset *basic_block_live_at_start;
 115
 116 /* What registers are live at the setjmp call.  */
 117
 118 extern regset regs_live_at_setjmp;
 119
 120 /* Indexed by n, gives number of basic block that  (REG n) is used in.
 121    If the value is REG_BLOCK_GLOBAL (-2),
 122    it means (REG n) is used in more than one basic block.
 123    REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
 124    This information remains valid for the rest of the compilation
 125    of the current function; it is used to control register allocation.  */
 126
 127 #define REG_BLOCK_UNKNOWN -1
 128 #define REG_BLOCK_GLOBAL -2
 129
 130 #define REG_BASIC_BLOCK(N) (reg_n_info[(N)].basic_block)