584 lines
20 KiB
C
584 lines
20 KiB
C
/* Define control and data flow tables, and regsets.
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Copyright (C) 1987, 1997, 1998, 1999, 2000 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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#ifndef _BASIC_BLOCK_H
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#define _BASIC_BLOCK_H 1
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#include "bitmap.h"
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#include "sbitmap.h"
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#include "varray.h"
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#include "partition.h"
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/* Head of register set linked list. */
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typedef bitmap_head regset_head;
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/* A pointer to a regset_head. */
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typedef bitmap regset;
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/* Initialize a new regset. */
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#define INIT_REG_SET(HEAD) bitmap_initialize (HEAD)
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/* Clear a register set by freeing up the linked list. */
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#define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD)
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/* Copy a register set to another register set. */
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#define COPY_REG_SET(TO, FROM) bitmap_copy (TO, FROM)
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/* Compare two register sets. */
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#define REG_SET_EQUAL_P(A, B) bitmap_equal_p (A, B)
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/* `and' a register set with a second register set. */
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#define AND_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_AND)
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/* `and' the complement of a register set with a register set. */
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#define AND_COMPL_REG_SET(TO, FROM) \
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bitmap_operation (TO, TO, FROM, BITMAP_AND_COMPL)
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/* Inclusive or a register set with a second register set. */
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#define IOR_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_IOR)
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/* Exclusive or a register set with a second register set. */
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#define XOR_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_XOR)
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/* Or into TO the register set FROM1 `and'ed with the complement of FROM2. */
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#define IOR_AND_COMPL_REG_SET(TO, FROM1, FROM2) \
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bitmap_ior_and_compl (TO, FROM1, FROM2)
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/* Clear a single register in a register set. */
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#define CLEAR_REGNO_REG_SET(HEAD, REG) bitmap_clear_bit (HEAD, REG)
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/* Set a single register in a register set. */
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#define SET_REGNO_REG_SET(HEAD, REG) bitmap_set_bit (HEAD, REG)
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/* Return true if a register is set in a register set. */
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#define REGNO_REG_SET_P(TO, REG) bitmap_bit_p (TO, REG)
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/* Copy the hard registers in a register set to the hard register set. */
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extern void reg_set_to_hard_reg_set PARAMS ((HARD_REG_SET *, bitmap));
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#define REG_SET_TO_HARD_REG_SET(TO, FROM) \
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do { \
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CLEAR_HARD_REG_SET (TO); \
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reg_set_to_hard_reg_set (&TO, FROM); \
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} while (0)
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/* Loop over all registers in REGSET, starting with MIN, setting REGNUM to the
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register number and executing CODE for all registers that are set. */
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#define EXECUTE_IF_SET_IN_REG_SET(REGSET, MIN, REGNUM, CODE) \
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EXECUTE_IF_SET_IN_BITMAP (REGSET, MIN, REGNUM, CODE)
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/* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
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REGNUM to the register number and executing CODE for all registers that are
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set in the first regset and not set in the second. */
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#define EXECUTE_IF_AND_COMPL_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
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EXECUTE_IF_AND_COMPL_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
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/* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
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REGNUM to the register number and executing CODE for all registers that are
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set in both regsets. */
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#define EXECUTE_IF_AND_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
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EXECUTE_IF_AND_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
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/* Allocate a register set with oballoc. */
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#define OBSTACK_ALLOC_REG_SET(OBSTACK) BITMAP_OBSTACK_ALLOC (OBSTACK)
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/* Initialize a register set. Returns the new register set. */
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#define INITIALIZE_REG_SET(HEAD) bitmap_initialize (&HEAD)
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/* Do any cleanup needed on a regset when it is no longer used. */
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#define FREE_REG_SET(REGSET) BITMAP_FREE(REGSET)
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/* Do any one-time initializations needed for regsets. */
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#define INIT_ONCE_REG_SET() BITMAP_INIT_ONCE ()
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/* Grow any tables needed when the number of registers is calculated
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or extended. For the linked list allocation, nothing needs to
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be done, other than zero the statistics on the first allocation. */
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#define MAX_REGNO_REG_SET(NUM_REGS, NEW_P, RENUMBER_P)
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/* Control flow edge information. */
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typedef struct edge_def {
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/* Links through the predecessor and successor lists. */
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struct edge_def *pred_next, *succ_next;
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/* The two blocks at the ends of the edge. */
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struct basic_block_def *src, *dest;
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/* Instructions queued on the edge. */
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rtx insns;
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/* Auxiliary info specific to a pass. */
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void *aux;
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int flags; /* see EDGE_* below */
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int probability; /* biased by REG_BR_PROB_BASE */
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int count; /* Expected number of executions calculated
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in profile.c */
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} *edge;
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#define EDGE_FALLTHRU 1
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#define EDGE_CRITICAL 2
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#define EDGE_ABNORMAL 4
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#define EDGE_ABNORMAL_CALL 8
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#define EDGE_EH 16
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#define EDGE_FAKE 32
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#define EDGE_COMPLEX (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_EH)
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/* Basic blocks need not start with a label nor end with a jump insn.
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For example, a previous basic block may just "conditionally fall"
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into the succeeding basic block, and the last basic block need not
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end with a jump insn. Block 0 is a descendant of the entry block.
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A basic block beginning with two labels cannot have notes between
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the labels.
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Data for jump tables are stored in jump_insns that occur in no
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basic block even though these insns can follow or precede insns in
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basic blocks. */
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/* Basic block information indexed by block number. */
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typedef struct basic_block_def {
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/* The first and last insns of the block. */
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rtx head, end;
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/* The edges into and out of the block. */
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edge pred, succ;
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/* Liveness info. Note that in SSA form, global_live_at_start does
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not reflect the use of regs in phi functions, since the liveness
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of these regs may depend on which edge was taken into the block. */
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regset local_set;
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regset cond_local_set;
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regset global_live_at_start;
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regset global_live_at_end;
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/* Auxiliary info specific to a pass. */
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void *aux;
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/* The index of this block. */
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int index;
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/* The loop depth of this block plus one. */
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int loop_depth;
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/* The active eh region before head and after end. */
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int eh_beg, eh_end;
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int count; /* Expected number of executions: calculated in
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profile.c */
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} *basic_block;
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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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/* Number of edges in the current function. */
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extern int n_edges;
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/* Index by basic block number, get basic block struct info. */
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extern varray_type basic_block_info;
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#define BASIC_BLOCK(N) (VARRAY_BB (basic_block_info, (N)))
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/* What registers are live at the setjmp call. */
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extern regset regs_live_at_setjmp;
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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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#define REG_BASIC_BLOCK(N) (VARRAY_REG (reg_n_info, N)->basic_block)
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/* Stuff for recording basic block info. */
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#define BLOCK_HEAD(B) (BASIC_BLOCK (B)->head)
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#define BLOCK_END(B) (BASIC_BLOCK (B)->end)
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/* Special block numbers [markers] for entry and exit. */
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#define ENTRY_BLOCK (-1)
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#define EXIT_BLOCK (-2)
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/* Special block number not valid for any block. */
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#define INVALID_BLOCK (-3)
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/* Similarly, block pointers for the edge list. */
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extern struct basic_block_def entry_exit_blocks[2];
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#define ENTRY_BLOCK_PTR (&entry_exit_blocks[0])
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#define EXIT_BLOCK_PTR (&entry_exit_blocks[1])
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extern varray_type basic_block_for_insn;
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#define BLOCK_FOR_INSN(INSN) VARRAY_BB (basic_block_for_insn, INSN_UID (INSN))
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#define BLOCK_NUM(INSN) (BLOCK_FOR_INSN (INSN)->index + 0)
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extern void compute_bb_for_insn PARAMS ((int));
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extern void update_bb_for_insn PARAMS ((basic_block));
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extern void set_block_for_insn PARAMS ((rtx, basic_block));
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extern void set_block_num PARAMS ((rtx, int));
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extern void free_basic_block_vars PARAMS ((int));
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extern edge split_block PARAMS ((basic_block, rtx));
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extern basic_block split_edge PARAMS ((edge));
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extern void insert_insn_on_edge PARAMS ((rtx, edge));
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extern void commit_edge_insertions PARAMS ((void));
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extern void remove_fake_edges PARAMS ((void));
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extern void add_noreturn_fake_exit_edges PARAMS ((void));
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extern void connect_infinite_loops_to_exit PARAMS ((void));
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extern int flow_call_edges_add PARAMS ((sbitmap));
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extern rtx flow_delete_insn PARAMS ((rtx));
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extern void flow_delete_insn_chain PARAMS ((rtx, rtx));
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extern void make_edge PARAMS ((sbitmap *, basic_block,
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basic_block, int));
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extern void remove_edge PARAMS ((edge));
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extern void redirect_edge_succ PARAMS ((edge, basic_block));
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extern void redirect_edge_pred PARAMS ((edge, basic_block));
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extern void create_basic_block PARAMS ((int, rtx, rtx, rtx));
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extern int flow_delete_block PARAMS ((basic_block));
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extern void merge_blocks_nomove PARAMS ((basic_block, basic_block));
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extern void tidy_fallthru_edge PARAMS ((edge, basic_block,
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basic_block));
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/* Structure to hold information for each natural loop. */
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struct loop
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{
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/* Index into loops array. */
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int num;
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/* Basic block of loop header. */
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basic_block header;
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/* Basic block of loop latch. */
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basic_block latch;
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/* Basic block of loop pre-header or NULL if it does not exist. */
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basic_block pre_header;
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/* Array of edges along the pre-header extended basic block trace.
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The source of the first edge is the root node of pre-header
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extended basic block, if it exists. */
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edge *pre_header_edges;
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/* Number of edges along the pre_header extended basic block trace. */
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int num_pre_header_edges;
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/* The first block in the loop. This is not necessarily the same as
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the loop header. */
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basic_block first;
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/* The last block in the loop. This is not necessarily the same as
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the loop latch. */
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basic_block last;
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/* Bitmap of blocks contained within the loop. */
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sbitmap nodes;
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/* Number of blocks contained within the loop. */
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int num_nodes;
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/* Array of edges that enter the loop. */
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edge *entry_edges;
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/* Number of edges that enter the loop. */
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int num_entries;
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/* Array of edges that exit the loop. */
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edge *exit_edges;
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/* Number of edges that exit the loop. */
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int num_exits;
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/* Bitmap of blocks that dominate all exits of the loop. */
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sbitmap exits_doms;
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/* The loop nesting depth. */
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int depth;
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/* The height of the loop (enclosed loop levels) within the loop
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hierarchy tree. */
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int level;
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/* The outer (parent) loop or NULL if outermost loop. */
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struct loop *outer;
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/* The first inner (child) loop or NULL if innermost loop. */
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struct loop *inner;
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/* Link to the next (sibling) loop. */
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struct loop *next;
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/* Non-zero if the loop shares a header with another loop. */
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int shared;
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/* Non-zero if the loop is invalid (e.g., contains setjmp.). */
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int invalid;
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/* Auxiliary info specific to a pass. */
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void *aux;
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/* The following are currently used by loop.c but they are likely to
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disappear as loop.c is converted to use the CFG. */
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/* Non-zero if the loop has a NOTE_INSN_LOOP_VTOP. */
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rtx vtop;
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/* Non-zero if the loop has a NOTE_INSN_LOOP_CONT.
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A continue statement will generate a branch to NEXT_INSN (cont). */
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rtx cont;
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/* The dominator of cont. */
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rtx cont_dominator;
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/* The NOTE_INSN_LOOP_BEG. */
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rtx start;
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/* The NOTE_INSN_LOOP_END. */
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rtx end;
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/* For a rotated loop that is entered near the bottom,
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this is the label at the top. Otherwise it is zero. */
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rtx top;
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/* Place in the loop where control enters. */
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rtx scan_start;
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/* The position where to sink insns out of the loop. */
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rtx sink;
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/* List of all LABEL_REFs which refer to code labels outside the
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loop. Used by routines that need to know all loop exits, such as
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final_biv_value and final_giv_value.
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This does not include loop exits due to return instructions.
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This is because all bivs and givs are pseudos, and hence must be
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dead after a return, so the presense of a return does not affect
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any of the optimizations that use this info. It is simpler to
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just not include return instructions on this list. */
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rtx exit_labels;
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/* The number of LABEL_REFs on exit_labels for this loop and all
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loops nested inside it. */
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int exit_count;
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};
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/* Structure to hold CFG information about natural loops within a function. */
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struct loops
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{
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/* Number of natural loops in the function. */
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int num;
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/* Maxium nested loop level in the function. */
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int levels;
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/* Array of natural loop descriptors (scanning this array in reverse order
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will find the inner loops before their enclosing outer loops). */
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struct loop *array;
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/* Pointer to root of loop heirachy tree. */
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struct loop *tree;
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/* Information derived from the CFG. */
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struct cfg
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{
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/* The bitmap vector of dominators or NULL if not computed. */
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sbitmap *dom;
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/* The ordering of the basic blocks in a depth first search. */
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int *dfs_order;
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/* The reverse completion ordering of the basic blocks found in a
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depth first search. */
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int *rc_order;
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} cfg;
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/* Headers shared by multiple loops that should be merged. */
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sbitmap shared_headers;
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};
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extern int flow_loops_find PARAMS ((struct loops *, int flags));
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extern int flow_loops_update PARAMS ((struct loops *, int flags));
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extern void flow_loops_free PARAMS ((struct loops *));
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||
extern void flow_loops_dump PARAMS ((const struct loops *, FILE *,
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void (*)(const struct loop *,
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FILE *, int), int));
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||
extern void flow_loop_dump PARAMS ((const struct loop *, FILE *,
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void (*)(const struct loop *,
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FILE *, int), int));
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extern int flow_loop_scan PARAMS ((struct loops *, struct loop *, int));
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||
|
||
/* This structure maintains an edge list vector. */
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||
struct edge_list
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||
{
|
||
int num_blocks;
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||
int num_edges;
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||
edge *index_to_edge;
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||
};
|
||
|
||
/* This is the value which indicates no edge is present. */
|
||
#define EDGE_INDEX_NO_EDGE -1
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/* EDGE_INDEX returns an integer index for an edge, or EDGE_INDEX_NO_EDGE
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||
if there is no edge between the 2 basic blocks. */
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#define EDGE_INDEX(el, pred, succ) (find_edge_index ((el), (pred), (succ)))
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||
|
||
/* INDEX_EDGE_PRED_BB and INDEX_EDGE_SUCC_BB return a pointer to the basic
|
||
block which is either the pred or succ end of the indexed edge. */
|
||
#define INDEX_EDGE_PRED_BB(el, index) ((el)->index_to_edge[(index)]->src)
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||
#define INDEX_EDGE_SUCC_BB(el, index) ((el)->index_to_edge[(index)]->dest)
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||
|
||
/* INDEX_EDGE returns a pointer to the edge. */
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||
#define INDEX_EDGE(el, index) ((el)->index_to_edge[(index)])
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||
|
||
/* Number of edges in the compressed edge list. */
|
||
#define NUM_EDGES(el) ((el)->num_edges)
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||
|
||
struct edge_list * create_edge_list PARAMS ((void));
|
||
void free_edge_list PARAMS ((struct edge_list *));
|
||
void print_edge_list PARAMS ((FILE *, struct edge_list *));
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||
void verify_edge_list PARAMS ((FILE *, struct edge_list *));
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||
int find_edge_index PARAMS ((struct edge_list *,
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||
basic_block, basic_block));
|
||
|
||
|
||
enum update_life_extent
|
||
{
|
||
UPDATE_LIFE_LOCAL = 0,
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||
UPDATE_LIFE_GLOBAL = 1,
|
||
UPDATE_LIFE_GLOBAL_RM_NOTES = 2
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||
};
|
||
|
||
/* Flags for life_analysis and update_life_info. */
|
||
|
||
#define PROP_DEATH_NOTES 1 /* Create DEAD and UNUSED notes. */
|
||
#define PROP_LOG_LINKS 2 /* Create LOG_LINKS. */
|
||
#define PROP_REG_INFO 4 /* Update regs_ever_live et al. */
|
||
#define PROP_KILL_DEAD_CODE 8 /* Remove dead code. */
|
||
#define PROP_SCAN_DEAD_CODE 16 /* Scan for dead code. */
|
||
#define PROP_AUTOINC 32 /* Create autoinc mem references. */
|
||
#define PROP_FINAL 63 /* All of the above. */
|
||
|
||
/* Flags for loop discovery. */
|
||
|
||
#define LOOP_TREE 1 /* Build loop hierarchy tree. */
|
||
#define LOOP_PRE_HEADER 2 /* Analyse loop pre-header. */
|
||
#define LOOP_ENTRY_EDGES 4 /* Find entry edges. */
|
||
#define LOOP_EXIT_EDGES 8 /* Find exit edges. */
|
||
#define LOOP_EDGES (LOOP_ENTRY_EDGES | LOOP_EXIT_EDGES)
|
||
#define LOOP_EXITS_DOMS 16 /* Find nodes that dom. all exits. */
|
||
#define LOOP_ALL 31 /* All of the above */
|
||
|
||
extern void life_analysis PARAMS ((rtx, FILE *, int));
|
||
extern void update_life_info PARAMS ((sbitmap, enum update_life_extent,
|
||
int));
|
||
extern int count_or_remove_death_notes PARAMS ((sbitmap, int));
|
||
extern void propagate_block PARAMS ((basic_block, regset, regset, regset,
|
||
int));
|
||
|
||
struct propagate_block_info;
|
||
extern rtx propagate_one_insn PARAMS ((struct propagate_block_info *, rtx));
|
||
extern struct propagate_block_info *init_propagate_block_info
|
||
PARAMS ((basic_block, regset, regset, regset, int));
|
||
extern void free_propagate_block_info PARAMS ((struct propagate_block_info *));
|
||
|
||
/* In lcm.c */
|
||
extern struct edge_list *pre_edge_lcm PARAMS ((FILE *, int, sbitmap *,
|
||
sbitmap *, sbitmap *,
|
||
sbitmap *, sbitmap **,
|
||
sbitmap **));
|
||
extern struct edge_list *pre_edge_rev_lcm PARAMS ((FILE *, int, sbitmap *,
|
||
sbitmap *, sbitmap *,
|
||
sbitmap *, sbitmap **,
|
||
sbitmap **));
|
||
extern void compute_available PARAMS ((sbitmap *, sbitmap *,
|
||
sbitmap *, sbitmap *));
|
||
extern int optimize_mode_switching PARAMS ((FILE *));
|
||
|
||
/* In emit-rtl.c. */
|
||
extern rtx emit_block_insn_after PARAMS ((rtx, rtx, basic_block));
|
||
extern rtx emit_block_insn_before PARAMS ((rtx, rtx, basic_block));
|
||
|
||
/* In predict.c */
|
||
extern void estimate_probability PARAMS ((struct loops *));
|
||
extern void expected_value_to_br_prob PARAMS ((void));
|
||
|
||
/* In flow.c */
|
||
extern void init_flow PARAMS ((void));
|
||
extern void reorder_basic_blocks PARAMS ((void));
|
||
extern void dump_bb PARAMS ((basic_block, FILE *));
|
||
extern void debug_bb PARAMS ((basic_block));
|
||
extern void debug_bb_n PARAMS ((int));
|
||
extern void dump_regset PARAMS ((regset, FILE *));
|
||
extern void debug_regset PARAMS ((regset));
|
||
extern void allocate_reg_life_data PARAMS ((void));
|
||
|
||
/* This function is always defined so it can be called from the
|
||
debugger, and it is declared extern so we don't get warnings about
|
||
it being unused. */
|
||
extern void verify_flow_info PARAMS ((void));
|
||
extern int flow_loop_outside_edge_p PARAMS ((const struct loop *, edge));
|
||
|
||
typedef struct conflict_graph_def *conflict_graph;
|
||
|
||
/* Callback function when enumerating conflicts. The arguments are
|
||
the smaller and larger regno in the conflict. Returns zero if
|
||
enumeration is to continue, non-zero to halt enumeration. */
|
||
typedef int (*conflict_graph_enum_fn) PARAMS ((int, int, void *));
|
||
|
||
|
||
/* Prototypes of operations on conflict graphs. */
|
||
|
||
extern conflict_graph conflict_graph_new
|
||
PARAMS ((int));
|
||
extern void conflict_graph_delete PARAMS ((conflict_graph));
|
||
extern int conflict_graph_add PARAMS ((conflict_graph,
|
||
int, int));
|
||
extern int conflict_graph_conflict_p PARAMS ((conflict_graph,
|
||
int, int));
|
||
extern void conflict_graph_enum PARAMS ((conflict_graph, int,
|
||
conflict_graph_enum_fn,
|
||
void *));
|
||
extern void conflict_graph_merge_regs PARAMS ((conflict_graph, int,
|
||
int));
|
||
extern void conflict_graph_print PARAMS ((conflict_graph, FILE*));
|
||
extern conflict_graph conflict_graph_compute
|
||
PARAMS ((regset,
|
||
partition));
|
||
|
||
/* In dominance.c */
|
||
|
||
enum cdi_direction
|
||
{
|
||
CDI_DOMINATORS,
|
||
CDI_POST_DOMINATORS
|
||
};
|
||
|
||
extern void calculate_dominance_info PARAMS ((int *, sbitmap *,
|
||
enum cdi_direction));
|
||
|
||
#endif /* _BASIC_BLOCK_H */
|