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Annotation of gcc/basic-block.h, revision 1.1.1.3

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: 
1.1.1.2   root       25: typedef long *regset;
1.1       root       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.
1.1.1.3 ! root       55:    If the value is REG_BLOCK_GLOBAL (-2),
        !            56:    it means (REG n) is used in more than one basic block.
        !            57:    REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
        !            58:    This information remains valid for the rest of the compilation
        !            59:    of the current function; it is used to control register allocation.  */
1.1       root       60: 
1.1.1.3 ! root       61: #define REG_BLOCK_UNKNOWN -1
        !            62: #define REG_BLOCK_GLOBAL -2
1.1       root       63: extern short *reg_basic_block;

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