mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
263 lines
8.8 KiB
C
263 lines
8.8 KiB
C
/* Define control and data flow tables, and regsets.
|
||
Copyright (C) 1987, 1997, 1998, 1999 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, 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
|
||
#include "bitmap.h"
|
||
#include "sbitmap.h"
|
||
#include "varray.h"
|
||
|
||
typedef bitmap regset; /* Head of register set linked list. */
|
||
|
||
/* Clear a register set by freeing up the linked list. */
|
||
#define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD)
|
||
|
||
/* Copy a register set to another register set. */
|
||
#define COPY_REG_SET(TO, FROM) bitmap_copy (TO, FROM)
|
||
|
||
/* `and' a register set with a second register set. */
|
||
#define AND_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_AND)
|
||
|
||
/* `and' the complement of a register set with a register set. */
|
||
#define AND_COMPL_REG_SET(TO, FROM) \
|
||
bitmap_operation (TO, TO, FROM, BITMAP_AND_COMPL)
|
||
|
||
/* Inclusive or a register set with a second register set. */
|
||
#define IOR_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_IOR)
|
||
|
||
/* Or into TO the register set FROM1 `and'ed with the complement of FROM2. */
|
||
#define IOR_AND_COMPL_REG_SET(TO, FROM1, FROM2) \
|
||
bitmap_ior_and_compl (TO, FROM1, FROM2)
|
||
|
||
/* Clear a single register in a register set. */
|
||
#define CLEAR_REGNO_REG_SET(HEAD, REG) bitmap_clear_bit (HEAD, REG)
|
||
|
||
/* Set a single register in a register set. */
|
||
#define SET_REGNO_REG_SET(HEAD, REG) bitmap_set_bit (HEAD, REG)
|
||
|
||
/* Return true if a register is set in a register set. */
|
||
#define REGNO_REG_SET_P(TO, REG) bitmap_bit_p (TO, REG)
|
||
|
||
/* Copy the hard registers in a register set to the hard register set. */
|
||
#define REG_SET_TO_HARD_REG_SET(TO, FROM) \
|
||
do { \
|
||
int i_; \
|
||
CLEAR_HARD_REG_SET (TO); \
|
||
for (i_ = 0; i_ < FIRST_PSEUDO_REGISTER; i_++) \
|
||
if (REGNO_REG_SET_P (FROM, i_)) \
|
||
SET_HARD_REG_BIT (TO, i_); \
|
||
} while (0)
|
||
|
||
/* Loop over all registers in REGSET, starting with MIN, setting REGNUM to the
|
||
register number and executing CODE for all registers that are set. */
|
||
#define EXECUTE_IF_SET_IN_REG_SET(REGSET, MIN, REGNUM, CODE) \
|
||
EXECUTE_IF_SET_IN_BITMAP (REGSET, MIN, REGNUM, CODE)
|
||
|
||
/* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
|
||
REGNUM to the register number and executing CODE for all registers that are
|
||
set in the first regset and not set in the second. */
|
||
#define EXECUTE_IF_AND_COMPL_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
|
||
EXECUTE_IF_AND_COMPL_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
|
||
|
||
/* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
|
||
REGNUM to the register number and executing CODE for all registers that are
|
||
set in both regsets. */
|
||
#define EXECUTE_IF_AND_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
|
||
EXECUTE_IF_AND_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
|
||
|
||
/* Allocate a register set with oballoc. */
|
||
#define OBSTACK_ALLOC_REG_SET(OBSTACK) BITMAP_OBSTACK_ALLOC (OBSTACK)
|
||
|
||
/* Allocate a register set with alloca. */
|
||
#define ALLOCA_REG_SET() BITMAP_ALLOCA ()
|
||
|
||
/* Do any cleanup needed on a regset when it is no longer used. */
|
||
#define FREE_REG_SET(REGSET) BITMAP_FREE(REGSET)
|
||
|
||
/* Do any one-time initializations needed for regsets. */
|
||
#define INIT_ONCE_REG_SET() BITMAP_INIT_ONCE ()
|
||
|
||
/* Grow any tables needed when the number of registers is calculated
|
||
or extended. For the linked list allocation, nothing needs to
|
||
be done, other than zero the statistics on the first allocation. */
|
||
#define MAX_REGNO_REG_SET(NUM_REGS, NEW_P, RENUMBER_P)
|
||
|
||
/* Control flow edge information. */
|
||
typedef struct edge_def {
|
||
/* Links through the predecessor and successor lists. */
|
||
struct edge_def *pred_next, *succ_next;
|
||
|
||
/* The two blocks at the ends of the edge. */
|
||
struct basic_block_def *src, *dest;
|
||
|
||
/* Instructions queued on the edge. */
|
||
rtx insns;
|
||
|
||
/* Auxiliary info specific to a pass. */
|
||
void *aux;
|
||
|
||
int flags; /* see EDGE_* below */
|
||
int probability; /* biased by REG_BR_PROB_BASE */
|
||
} *edge;
|
||
|
||
#define EDGE_FALLTHRU 1
|
||
#define EDGE_CRITICAL 2
|
||
#define EDGE_ABNORMAL 4
|
||
#define EDGE_ABNORMAL_CALL 8
|
||
#define EDGE_EH 16
|
||
#define EDGE_FAKE 32
|
||
|
||
|
||
/* Basic block information indexed by block number. */
|
||
typedef struct basic_block_def {
|
||
/* The first and last insns of the block. */
|
||
rtx head, end;
|
||
|
||
/* The edges into and out of the block. */
|
||
edge pred, succ;
|
||
|
||
/* Liveness info. */
|
||
regset local_set;
|
||
regset global_live_at_start;
|
||
regset global_live_at_end;
|
||
|
||
/* Auxiliary info specific to a pass. */
|
||
void *aux;
|
||
|
||
/* The index of this block. */
|
||
int index;
|
||
/* The loop depth of this block plus one. */
|
||
int loop_depth;
|
||
} *basic_block;
|
||
|
||
/* Number of basic blocks in the current function. */
|
||
|
||
extern int n_basic_blocks;
|
||
|
||
/* Index by basic block number, get basic block struct info. */
|
||
|
||
extern varray_type basic_block_info;
|
||
|
||
#define BASIC_BLOCK(N) (VARRAY_BB (basic_block_info, (N)))
|
||
|
||
/* What registers are live at the setjmp call. */
|
||
|
||
extern regset regs_live_at_setjmp;
|
||
|
||
/* 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
|
||
|
||
#define REG_BASIC_BLOCK(N) (VARRAY_REG (reg_n_info, N)->basic_block)
|
||
|
||
/* List of integers.
|
||
These are used for storing things like predecessors, etc.
|
||
|
||
This scheme isn't very space efficient, especially on 64 bit machines.
|
||
The interface is designed so that the implementation can be replaced with
|
||
something more efficient if desirable. */
|
||
|
||
typedef struct int_list {
|
||
struct int_list *next;
|
||
int val;
|
||
} int_list;
|
||
|
||
typedef int_list *int_list_ptr;
|
||
|
||
/* Integer list elements are allocated in blocks to reduce the frequency
|
||
of calls to malloc and to reduce the associated space overhead. */
|
||
|
||
typedef struct int_list_block {
|
||
struct int_list_block *next;
|
||
int nodes_left;
|
||
#define INT_LIST_NODES_IN_BLK 500
|
||
struct int_list nodes[INT_LIST_NODES_IN_BLK];
|
||
} int_list_block;
|
||
|
||
/* Given a pointer to the list, return pointer to first element. */
|
||
#define INT_LIST_FIRST(il) (il)
|
||
|
||
/* Given a pointer to a list element, return pointer to next element. */
|
||
#define INT_LIST_NEXT(p) ((p)->next)
|
||
|
||
/* Return non-zero if P points to the end of the list. */
|
||
#define INT_LIST_END(p) ((p) == NULL)
|
||
|
||
/* Return element pointed to by P. */
|
||
#define INT_LIST_VAL(p) ((p)->val)
|
||
|
||
#define INT_LIST_SET_VAL(p, new_val) ((p)->val = (new_val))
|
||
|
||
extern void free_int_list PROTO ((int_list_block **));
|
||
|
||
/* Stuff for recording basic block info. */
|
||
|
||
#define BLOCK_HEAD(B) (BASIC_BLOCK (B)->head)
|
||
#define BLOCK_END(B) (BASIC_BLOCK (B)->end)
|
||
|
||
/* Special block numbers [markers] for entry and exit. */
|
||
#define ENTRY_BLOCK (-1)
|
||
#define EXIT_BLOCK (-2)
|
||
|
||
/* Similarly, block pointers for the edge list. */
|
||
extern struct basic_block_def entry_exit_blocks[2];
|
||
#define ENTRY_BLOCK_PTR (&entry_exit_blocks[0])
|
||
#define EXIT_BLOCK_PTR (&entry_exit_blocks[1])
|
||
|
||
/* from flow.c */
|
||
extern void free_regset_vector PROTO ((regset *, int nelts));
|
||
|
||
extern varray_type basic_block_for_insn;
|
||
#define BLOCK_FOR_INSN(INSN) VARRAY_BB (basic_block_for_insn, INSN_UID (INSN))
|
||
#define BLOCK_NUM(INSN) (BLOCK_FOR_INSN (INSN)->index + 0)
|
||
|
||
extern void set_block_for_insn PROTO ((rtx, basic_block));
|
||
|
||
extern void dump_bb_data PROTO ((FILE *, int_list_ptr *,
|
||
int_list_ptr *, int));
|
||
extern void free_bb_mem PROTO ((void));
|
||
extern void free_basic_block_vars PROTO ((int));
|
||
|
||
extern basic_block split_edge PROTO ((edge));
|
||
extern void insert_insn_on_edge PROTO ((rtx, edge));
|
||
extern void commit_edge_insertions PROTO ((void));
|
||
|
||
extern void compute_preds_succs PROTO ((int_list_ptr *, int_list_ptr *,
|
||
int *, int *));
|
||
extern void compute_dominators PROTO ((sbitmap *, sbitmap *,
|
||
int_list_ptr *,
|
||
int_list_ptr *));
|
||
extern void compute_immediate_dominators PROTO ((int *, sbitmap *));
|
||
|
||
/* In lcm.c */
|
||
extern void pre_lcm PROTO ((int, int, int_list_ptr *,
|
||
int_list_ptr *,
|
||
sbitmap *, sbitmap *,
|
||
sbitmap *, sbitmap *));
|
||
extern void pre_rev_lcm PROTO ((int, int, int_list_ptr *,
|
||
int_list_ptr *,
|
||
sbitmap *, sbitmap *,
|
||
sbitmap *, sbitmap *));
|