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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 distributed in the hope that it will be useful,
        !             7: but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: accepts responsibility to anyone for the consequences of using it
        !             9: or for whether it serves any particular purpose or works at all,
        !            10: unless he says so in writing.  Refer to the GNU CC General Public
        !            11: License for full details.
        !            12: 
        !            13: Everyone is granted permission to copy, modify and redistribute
        !            14: GNU CC, but only under the conditions described in the
        !            15: GNU CC General Public License.   A copy of this license is
        !            16: supposed to have been given to you along with GNU CC so you
        !            17: can know your rights and responsibilities.  It should be in a
        !            18: file named COPYING.  Among other things, the copyright notice
        !            19: and this notice must be preserved on all copies.  */
        !            20: 
        !            21: 
        !            22: /* Define the type for a pointer to a set with a bit for each
        !            23:    (hard or pseudo) register.  */
        !            24: 
        !            25: typedef int *regset;
        !            26: 
        !            27: /* Size of a regset for the current function,
        !            28:    in (1) bytes and (2) elements.  */
        !            29: 
        !            30: extern int regset_bytes;
        !            31: extern int regset_size;
        !            32: 
        !            33: /* Number of bits in each actual element of a regset.  */
        !            34: 
        !            35: #define REGSET_ELT_BITS HOST_BITS_PER_INT
        !            36: 
        !            37: /* Number of basic blocks in the current function.  */
        !            38: 
        !            39: extern int n_basic_blocks;
        !            40: 
        !            41: /* Index by basic block number, get first insn in the block.  */
        !            42: 
        !            43: extern rtx *basic_block_head;
        !            44: 
        !            45: /* Index by basic block number, get last insn in the block.  */
        !            46: 
        !            47: extern rtx *basic_block_end;
        !            48: 
        !            49: /* Index by basic block number, get address of regset
        !            50:    describing the registers live at the start of that block.  */
        !            51: 
        !            52: extern regset *basic_block_live_at_start;
        !            53: 
        !            54: /* Indexed by n, gives number of basic block that  (REG n) is used in.
        !            55:    Or gives -2 if (REG n) is used in more than one basic block.
        !            56:    Or -1 if it has not yet been seen so no basic block is known.  */
        !            57: 
        !            58: extern short *reg_basic_block;

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