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Annotation of gcc/basic-block.h, revision 1.1

1.1     ! root        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: /* Define the type for a pointer to a set with a bit for each
        !            22:    (hard or pseudo) register.  */
        !            23: 
        !            24: typedef long *regset;
        !            25: 
        !            26: /* Size of a regset for the current function,
        !            27:    in (1) bytes and (2) elements.  */
        !            28: 
        !            29: extern int regset_bytes;
        !            30: extern int regset_size;
        !            31: 
        !            32: /* Number of bits in each actual element of a regset.  */
        !            33: 
        !            34: #define REGSET_ELT_BITS HOST_BITS_PER_INT
        !            35: 
        !            36: /* Number of basic blocks in the current function.  */
        !            37: 
        !            38: extern int n_basic_blocks;
        !            39: 
        !            40: /* Index by basic block number, get first insn in the block.  */
        !            41: 
        !            42: extern rtx *basic_block_head;
        !            43: 
        !            44: /* Index by basic block number, get last insn in the block.  */
        !            45: 
        !            46: extern rtx *basic_block_end;
        !            47: 
        !            48: /* Index by basic block number, get address of regset
        !            49:    describing the registers live at the start of that block.  */
        !            50: 
        !            51: extern regset *basic_block_live_at_start;
        !            52: 
        !            53: /* Indexed by n, gives number of basic block that  (REG n) is used in.
        !            54:    If the value is REG_BLOCK_GLOBAL (-2),
        !            55:    it means (REG n) is used in more than one basic block.
        !            56:    REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
        !            57:    This information remains valid for the rest of the compilation
        !            58:    of the current function; it is used to control register allocation.  */
        !            59: 
        !            60: #define REG_BLOCK_UNKNOWN -1
        !            61: #define REG_BLOCK_GLOBAL -2
        !            62: extern short *reg_basic_block;

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