projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 9bf86ebb PR |
1 | /* Define control and data flow tables, and regsets. |
| 2 | Copyright (C) 1987 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, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| 19 | ||
| 20 | ||
| 21 | /* Number of bits in each actual element of a regset. */ | |
| 22 | ||
| 23 | #define REGSET_ELT_BITS HOST_BITS_PER_WIDE_INT | |
| 24 | ||
| 25 | /* Type to use for a regset element. Note that lots of code assumes | |
| 26 | that the initial part of a regset that contains information on the | |
| 27 | hard registers is the same format as a HARD_REG_SET. */ | |
| 28 | ||
| 29 | #define REGSET_ELT_TYPE HOST_WIDE_INT | |
| 30 | ||
| 31 | /* Define the type for a pointer to a set with a bit for each | |
| 32 | (hard or pseudo) register. */ | |
| 33 | ||
| 34 | typedef REGSET_ELT_TYPE *regset; | |
| 35 | ||
| 36 | /* Size of a regset for the current function, | |
| 37 | in (1) bytes and (2) elements. */ | |
| 38 | ||
| 39 | extern int regset_bytes; | |
| 40 | extern int regset_size; | |
| 41 | ||
| 42 | /* Number of basic blocks in the current function. */ | |
| 43 | ||
| 44 | extern int n_basic_blocks; | |
| 45 | ||
| 46 | /* Index by basic block number, get first insn in the block. */ | |
| 47 | ||
| 48 | extern rtx *basic_block_head; | |
| 49 | ||
| 50 | /* Index by basic block number, get last insn in the block. */ | |
| 51 | ||
| 52 | extern rtx *basic_block_end; | |
| 53 | ||
| 54 | /* Index by basic block number, get address of regset | |
| 55 | describing the registers live at the start of that block. */ | |
| 56 | ||
| 57 | extern regset *basic_block_live_at_start; | |
| 58 | ||
| 59 | /* Indexed by n, gives number of basic block that (REG n) is used in. | |
| 60 | If the value is REG_BLOCK_GLOBAL (-2), | |
| 61 | it means (REG n) is used in more than one basic block. | |
| 62 | REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know. | |
| 63 | This information remains valid for the rest of the compilation | |
| 64 | of the current function; it is used to control register allocation. */ | |
| 65 | ||
| 66 | #define REG_BLOCK_UNKNOWN -1 | |
| 67 | #define REG_BLOCK_GLOBAL -2 | |
| 68 | extern int *reg_basic_block; |