1 | /* Define control and data flow tables, and regsets. |
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2 | Copyright (C) 1987 Free Software Foundation, Inc. |
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3 | |
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4 | This file is part of GNU CC. |
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5 | |
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6 | GNU CC is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 2, or (at your option) |
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9 | any later version. |
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10 | |
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11 | GNU CC is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with GNU CC; see the file COPYING. If not, write to |
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18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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19 | Boston, MA 02111-1307, USA. */ |
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20 | |
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21 | |
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22 | /* Number of bits in each actual element of a regset. */ |
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23 | |
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24 | #define REGSET_ELT_BITS HOST_BITS_PER_WIDE_INT |
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25 | |
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26 | /* Type to use for a regset element. Note that lots of code assumes |
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27 | that the initial part of a regset that contains information on the |
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28 | hard registers is the same format as a HARD_REG_SET. */ |
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29 | |
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30 | #define REGSET_ELT_TYPE unsigned HOST_WIDE_INT |
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31 | |
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32 | /* Define the type for a pointer to a set with a bit for each |
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33 | (hard or pseudo) register. */ |
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34 | |
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35 | typedef REGSET_ELT_TYPE *regset; |
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36 | |
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37 | /* Size of a regset for the current function, |
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38 | in (1) bytes and (2) elements. */ |
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39 | |
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40 | extern int regset_bytes; |
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41 | extern int regset_size; |
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42 | |
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43 | /* Number of basic blocks in the current function. */ |
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44 | |
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45 | extern int n_basic_blocks; |
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46 | |
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47 | /* Index by basic block number, get first insn in the block. */ |
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48 | |
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49 | extern rtx *basic_block_head; |
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50 | |
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51 | /* Index by basic block number, get last insn in the block. */ |
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52 | |
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53 | extern rtx *basic_block_end; |
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54 | |
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55 | /* Index by basic block number, get address of regset |
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56 | describing the registers live at the start of that block. */ |
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57 | |
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58 | extern regset *basic_block_live_at_start; |
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59 | |
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60 | /* Indexed by n, gives number of basic block that (REG n) is used in. |
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61 | If the value is REG_BLOCK_GLOBAL (-2), |
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62 | it means (REG n) is used in more than one basic block. |
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63 | REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know. |
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64 | This information remains valid for the rest of the compilation |
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65 | of the current function; it is used to control register allocation. */ |
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66 | |
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67 | #define REG_BLOCK_UNKNOWN -1 |
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68 | #define REG_BLOCK_GLOBAL -2 |
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69 | extern int *reg_basic_block; |
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