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Education Sampler 1992 [NeXTSTEP]
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cc-61.0.1
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cc
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basic-block.h
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1991-06-03
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/* Define control and data flow tables, and regsets.
Copyright (C) 1987 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Define the type for a pointer to a set with a bit for each
(hard or pseudo) register. */
typedef long *regset;
/* Size of a regset for the current function,
in (1) bytes and (2) elements. */
extern int regset_bytes;
extern int regset_size;
/* Number of bits in each actual element of a regset. */
#define REGSET_ELT_BITS HOST_BITS_PER_INT
/* Number of basic blocks in the current function. */
extern int n_basic_blocks;
/* Index by basic block number, get first insn in the block. */
extern rtx *basic_block_head;
/* Index by basic block number, get last insn in the block. */
extern rtx *basic_block_end;
/* Index by basic block number, get address of regset
describing the registers live at the start of that block. */
extern regset *basic_block_live_at_start;
/* Indexed by n, gives number of basic block that (REG n) is used in.
If the value is REG_BLOCK_GLOBAL (-2),
it means (REG n) is used in more than one basic block.
REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
This information remains valid for the rest of the compilation
of the current function; it is used to control register allocation. */
#define REG_BLOCK_UNKNOWN -1
#define REG_BLOCK_GLOBAL -2
extern short *reg_basic_block;