70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
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/* Define control and data flow tables, and regsets.
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Copyright (C) 1987 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Number of bits in each actual element of a regset. */
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#define REGSET_ELT_BITS HOST_BITS_PER_WIDE_INT
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/* Type to use for a regset element. Note that lots of code assumes
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that the initial part of a regset that contains information on the
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hard registers is the same format as a HARD_REG_SET. */
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#define REGSET_ELT_TYPE unsigned HOST_WIDE_INT
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/* Define the type for a pointer to a set with a bit for each
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(hard or pseudo) register. */
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typedef REGSET_ELT_TYPE *regset;
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/* Size of a regset for the current function,
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in (1) bytes and (2) elements. */
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extern int regset_bytes;
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extern int regset_size;
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/* Number of basic blocks in the current function. */
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extern int n_basic_blocks;
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/* Index by basic block number, get first insn in the block. */
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extern rtx *basic_block_head;
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/* Index by basic block number, get last insn in the block. */
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extern rtx *basic_block_end;
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/* Index by basic block number, get address of regset
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describing the registers live at the start of that block. */
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extern regset *basic_block_live_at_start;
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/* Indexed by n, gives number of basic block that (REG n) is used in.
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If the value is REG_BLOCK_GLOBAL (-2),
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it means (REG n) is used in more than one basic block.
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REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
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This information remains valid for the rest of the compilation
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of the current function; it is used to control register allocation. */
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#define REG_BLOCK_UNKNOWN -1
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#define REG_BLOCK_GLOBAL -2
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extern int *reg_basic_block;
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