M68K TLS support.

[pf3gnuchains/gcc-fork.git] / gcc / df.h

diff --git a/gcc/df.h b/gcc/df.h
index ef94656..f8084e0 100644 (file)
--- a/gcc/df.h
+++ b/gcc/df.h
@@ -1,13 +1,17 @@
 /* Form lists of pseudo register references for autoinc optimization
    for GNU compiler.  This is part of flow optimization.
 /* Form lists of pseudo register references for autoinc optimization
    for GNU compiler.  This is part of flow optimization.

-   Copyright (C) 1999, 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
-   Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz)
+   Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+   Free Software Foundation, Inc.
+   Originally contributed by Michael P. Hayes 
+             (m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com)
+   Major rewrite contributed by Danny Berlin (dberlin@dberlin.org)
+             and Kenneth Zadeck (zadeck@naturalbridge.com).

 
 This file is part of GCC.
 
 GCC 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
 
 This file is part of GCC.
 
 GCC 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
+Software Foundation; either version 3, or (at your option) any later

 version.
 
 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
 version.
 
 GCC is distributed in the hope that it will be useful, but WITHOUT ANY


@@ -16,354 +20,1072 @@ 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
 for more details.
 
 You should have received a copy of the GNU General Public License

-along with GCC; see the file COPYING.  If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA.  */
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */

 
 #ifndef GCC_DF_H
 #define GCC_DF_H
 
 #include "bitmap.h"
 
 #ifndef GCC_DF_H
 #define GCC_DF_H
 
 #include "bitmap.h"

-#include "sbitmap.h"

 #include "basic-block.h"
 #include "basic-block.h"

+#include "alloc-pool.h"
+#include "timevar.h"
+
+struct dataflow;
+struct df;
+struct df_problem;
+struct df_link;
+struct df_insn_info;
+union df_ref_d;
+
+/* Data flow problems.  All problems must have a unique id here.  */ 
+
+/* Scanning is not really a dataflow problem, but it is useful to have
+   the basic block functions in the vector so that things get done in
+   a uniform manner.  The last four problems can be added or deleted
+   at any time are always defined (though LIVE is always there at -O2
+   or higher); the others are always there.  */
+#define DF_SCAN    0 
+#define DF_LR      1      /* Live Registers backward. */
+#define DF_LIVE    2      /* Live Registers & Uninitialized Registers */
+#define DF_RD      3      /* Reaching Defs. */
+#define DF_CHAIN   4      /* Def-Use and/or Use-Def Chains. */
+#define DF_BYTE_LR 5      /* Subreg tracking lr.  */
+#define DF_NOTE    6      /* REG_DEF and REG_UNUSED notes. */
+
+#define DF_LAST_PROBLEM_PLUS1 (DF_NOTE + 1)

 
 

-#define DF_RD          1       /* Reaching definitions.  */
-#define DF_RU          2       /* Reaching uses.  */
-#define DF_LR          4       /* Live registers.  */
-#define DF_DU_CHAIN    8       /* Def-use chain.  */
-#define DF_UD_CHAIN    16      /* Use-def chain.  */
-#define DF_REG_INFO    32      /* Register info.  */
-#define DF_RD_CHAIN    64      /* Reg-def chain.  */
-#define DF_RU_CHAIN    128     /* Reg-use chain.  */
-#define DF_ALL         255
-#define DF_HARD_REGS   1024    /* Mark hard registers.  */
-#define DF_EQUIV_NOTES 2048    /* Mark uses present in EQUIV/EQUAL notes.  */
-#define DF_FOR_REGALLOC        4096    /* If called for the register allocator.  */
-
-enum df_ref_type {DF_REF_REG_DEF, DF_REF_REG_USE, DF_REF_REG_MEM_LOAD,
-                 DF_REF_REG_MEM_STORE};
-
-#define DF_REF_TYPE_NAMES {"def", "use", "mem load", "mem store"}
-
-/* Link on a def-use or use-def chain.  */
-struct df_link
-{
-  struct df_link *next;
-  struct ref *ref;
-};
+/* Dataflow direction.  */
+enum df_flow_dir
+  {
+    DF_NONE,
+    DF_FORWARD,
+    DF_BACKWARD
+  };
+
+/* Used in the byte scanning to determine if may or must info is to be
+   returned.  */
+enum df_mm
+  {
+    DF_MM_MAY,
+    DF_MM_MUST
+  };
+
+/* Descriminator for the various df_ref types.  */
+enum df_ref_class {DF_REF_BASE, DF_REF_ARTIFICIAL, DF_REF_REGULAR, DF_REF_EXTRACT};
+
+/* The first of these us a set of a registers.  The remaining three
+   are all uses of a register (the mem_load and mem_store relate to
+   how the register as an addressing operand).  */
+enum df_ref_type {DF_REF_REG_DEF, DF_REF_REG_USE,
+                 DF_REF_REG_MEM_LOAD, DF_REF_REG_MEM_STORE};

 
 enum df_ref_flags
   {
 
 enum df_ref_flags
   {

+    /* This flag is set if this ref occurs inside of a conditional
+       execution instruction.  */
+    DF_REF_CONDITIONAL = 1 << 0,
+
+    /* If this flag is set for an artificial use or def, that ref
+       logically happens at the top of the block.  If it is not set
+       for an artificial use or def, that ref logically happens at the
+       bottom of the block.  This is never set for regular refs.  */
+    DF_REF_AT_TOP = 1 << 1,
+
+    /* This flag is set if the use is inside a REG_EQUAL or REG_EQUIV
+       note.  */
+    DF_REF_IN_NOTE = 1 << 2,
+
+    /* This bit is true if this ref can make regs_ever_live true for
+       this regno.  */
+    DF_HARD_REG_LIVE = 1 << 3,
+
+
+    /* This flag is set if this ref is a partial use or def of the
+       associated register.  */
+    DF_REF_PARTIAL = 1 << 4,
+    

     /* Read-modify-write refs generate both a use and a def and
        these are marked with this flag to show that they are not
        independent.  */
     /* Read-modify-write refs generate both a use and a def and
        these are marked with this flag to show that they are not
        independent.  */

-    DF_REF_READ_WRITE = 1,
-
-    /* This flag is set on register references inside a subreg on
-       machines which have CANNOT_CHANGE_MODE_CLASS.
-       Note, that this flag can also be set on df_refs representing
-       the REG itself (i.e., one might not see the subreg anymore).
-       Also note, that this flag is set also for hardreg refs, i.e.,
-       you must check yourself if it's a pseudo.  */
-    DF_REF_MODE_CHANGE = 2,
-
-    /* This flag is set, if we stripped the subreg from the reference.
-       In this case we must make conservative guesses, at what the
-       outer mode was.  */
-    DF_REF_STRIPPED = 4,
-
-    /* This flag is set during register allocation if it's okay for
-    the reference's INSN to have one of its operands replaced with a
-    memory reference.  */
-    DF_REF_MEM_OK = 8
-  };
+    DF_REF_READ_WRITE = 1 << 5,

 
 

+    /* This flag is set if this ref, generally a def, may clobber the
+       referenced register.  This is generally only set for hard
+       registers that cross a call site.  With better information
+       about calls, some of these could be changed in the future to
+       DF_REF_MUST_CLOBBER.  */
+    DF_REF_MAY_CLOBBER = 1 << 6,

 
 

-/* Define a register reference structure.  One of these is allocated
-   for every register reference (use or def).  Note some register
-   references (e.g., post_inc, subreg) generate both a def and a use.  */
-struct ref
-{
-  rtx reg;                     /* The register referenced.  */
-  rtx insn;                    /* Insn containing ref.  */
-  rtx *loc;                    /* The location of the reg.  */
-  struct df_link *chain;       /* Head of def-use or use-def chain.  */
-  unsigned int id;             /* Ref index.  */
-  enum df_ref_type type;       /* Type of ref.  */
-  enum df_ref_flags flags;     /* Various flags.  */
-};
+    /* This flag is set if this ref, generally a def, is a real
+       clobber. This is not currently set for registers live across a
+       call because that clobbering may or may not happen.  

 
 

+       Most of the uses of this are with sets that have a
+       GET_CODE(..)==CLOBBER.  Note that this is set even if the
+       clobber is to a subreg.  So in order to tell if the clobber
+       wipes out the entire register, it is necessary to also check
+       the DF_REF_PARTIAL flag.  */
+    DF_REF_MUST_CLOBBER = 1 << 7,

 
 

-/* One of these structures is allocated for every insn.  */
-struct insn_info
-{
-  struct df_link *defs;                /* Head of insn-def chain.  */
-  struct df_link *uses;                /* Head of insn-use chain.  */
-  /* ???? The following luid field should be considered private so that
-     we can change it on the fly to accommodate new insns?  */
-  int luid;                    /* Logical UID.  */
-};

 
 

+    /* If the ref has one of the following two flags set, then the
+       struct df_ref can be cast to struct df_ref_extract to access
+       the width and offset fields.  */
+ 
+    /* This flag is set if the ref contains a SIGN_EXTRACT.  */
+    DF_REF_SIGN_EXTRACT = 1 << 8,

 
 

-/* One of these structures is allocated for every reg.  */
-struct reg_info
-{
-  struct df_link *defs;                /* Head of reg-def chain.  */
-  struct df_link *uses;                /* Head of reg-use chain.  */
-  int lifetime;
-  int n_defs;
-  int n_uses;
-};
+    /* This flag is set if the ref contains a ZERO_EXTRACT.  */
+    DF_REF_ZERO_EXTRACT = 1 << 9,

 
 

+    /* This flag is set if the ref contains a STRICT_LOW_PART.  */
+    DF_REF_STRICT_LOW_PART = 1 << 10,

 
 

-/* One of these structures is allocated for every basic block.  */
-struct bb_info
-{
-  /* Reaching def bitmaps have def_id elements.  */
-  bitmap rd_kill;
-  bitmap rd_gen;
-  bitmap rd_in;
-  bitmap rd_out;
-  /* Reaching use bitmaps have use_id elements.  */
-  bitmap ru_kill;
-  bitmap ru_gen;
-  bitmap ru_in;
-  bitmap ru_out;
-  /* Live variable bitmaps have n_regs elements.  */
-  bitmap lr_def;
-  bitmap lr_use;
-  bitmap lr_in;
-  bitmap lr_out;
-  int rd_valid;
-  int ru_valid;
-  int lr_valid;
+    /* This flag is set if the ref contains a SUBREG.  */
+    DF_REF_SUBREG = 1 << 11,
+
+
+    /* This bit is true if this ref is part of a multiword hardreg.  */
+    DF_REF_MW_HARDREG = 1 << 12,
+
+    /* This flag is set if this ref is a usage of the stack pointer by
+       a function call.  */
+    DF_REF_CALL_STACK_USAGE = 1 << 13,
+
+    /* This flag is used for verification of existing refs. */
+    DF_REF_REG_MARKER = 1 << 14,
+
+    /* This flag is set if this ref is inside a pre/post modify.  */
+    DF_REF_PRE_POST_MODIFY = 1 << 15
+
+  };
+
+/* The possible ordering of refs within the df_ref_info.  */
+enum df_ref_order
+  {
+    /* There is not table.  */ 
+    DF_REF_ORDER_NO_TABLE,
+
+    /* There is a table of refs but it is not (or no longer) organized
+       by one of the following methods.  */
+    DF_REF_ORDER_UNORDERED,
+    DF_REF_ORDER_UNORDERED_WITH_NOTES,
+  
+    /* Organize the table by reg order, all of the refs with regno 0
+       followed by all of the refs with regno 1 ... .  Within all of
+       the regs for a particular regno, the refs are unordered.  */
+    DF_REF_ORDER_BY_REG,
+
+    /* For uses, the refs within eq notes may be added for
+       DF_REF_ORDER_BY_REG.  */
+    DF_REF_ORDER_BY_REG_WITH_NOTES,
+
+    /* Organize the refs in insn order.  The insns are ordered within a
+       block, and the blocks are ordered by FOR_ALL_BB.  */  
+    DF_REF_ORDER_BY_INSN,
+
+    /* For uses, the refs within eq notes may be added for
+       DF_REF_ORDER_BY_INSN.  */
+    DF_REF_ORDER_BY_INSN_WITH_NOTES
+  };
+
+/* Function prototypes added to df_problem instance.  */
+
+/* Allocate the problem specific data.  */
+typedef void (*df_alloc_function) (bitmap);
+
+/* This function is called if the problem has global data that needs
+   to be cleared when ever the set of blocks changes.  The bitmap
+   contains the set of blocks that may require special attention.
+   This call is only made if some of the blocks are going to change.
+   If everything is to be deleted, the wholesale deletion mechanisms
+   apply. */
+typedef void (*df_reset_function) (bitmap);
+
+/* Free the basic block info.  Called from the block reordering code
+   to get rid of the blocks that have been squished down.   */
+typedef void (*df_free_bb_function) (basic_block, void *);
+
+/* Local compute function.  */
+typedef void (*df_local_compute_function) (bitmap);
+
+/* Init the solution specific data.  */
+typedef void (*df_init_function) (bitmap);
+
+/* Iterative dataflow function.  */
+typedef void (*df_dataflow_function) (struct dataflow *, bitmap, int *, int);
+
+/* Confluence operator for blocks with 0 out (or in) edges.  */
+typedef void (*df_confluence_function_0) (basic_block);
+
+/* Confluence operator for blocks with 1 or more out (or in) edges.  */
+typedef void (*df_confluence_function_n) (edge);
+
+/* Transfer function for blocks.  */
+typedef bool (*df_transfer_function) (int);
+
+/* Function to massage the information after the problem solving.  */
+typedef void (*df_finalizer_function) (bitmap);
+
+/* Function to free all of the problem specific datastructures.  */
+typedef void (*df_free_function) (void);
+
+/* Function to remove this problem from the stack of dataflow problems
+   without effecting the other problems in the stack except for those
+   that depend on this problem.  */
+typedef void (*df_remove_problem_function) (void);
+
+/* Function to dump basic block independent results to FILE.  */
+typedef void (*df_dump_problem_function) (FILE *);
+
+/* Function to dump top or bottom of basic block results to FILE.  */
+typedef void (*df_dump_bb_problem_function) (basic_block, FILE *);
+
+/* Function to dump top or bottom of basic block results to FILE.  */
+typedef void (*df_verify_solution_start) (void);
+
+/* Function to dump top or bottom of basic block results to FILE.  */
+typedef void (*df_verify_solution_end) (void);
+
+/* The static description of a dataflow problem to solve.  See above
+   typedefs for doc for the function fields.  */
+
+struct df_problem {
+  /* The unique id of the problem.  This is used it index into
+     df->defined_problems to make accessing the problem data easy.  */
+  unsigned int id;                        
+  enum df_flow_dir dir;                        /* Dataflow direction.  */
+  df_alloc_function alloc_fun;
+  df_reset_function reset_fun;
+  df_free_bb_function free_bb_fun;
+  df_local_compute_function local_compute_fun;
+  df_init_function init_fun;
+  df_dataflow_function dataflow_fun;
+  df_confluence_function_0 con_fun_0;
+  df_confluence_function_n con_fun_n;
+  df_transfer_function trans_fun;
+  df_finalizer_function finalize_fun;
+  df_free_function free_fun;
+  df_remove_problem_function remove_problem_fun;
+  df_dump_problem_function dump_start_fun;
+  df_dump_bb_problem_function dump_top_fun;
+  df_dump_bb_problem_function dump_bottom_fun;
+  df_verify_solution_start verify_start_fun;
+  df_verify_solution_end verify_end_fun;
+  struct df_problem *dependent_problem;
+
+  /* The timevar id associated with this pass.  */
+  timevar_id_t tv_id;
+
+  /* True if the df_set_blocks should null out the basic block info if
+     this block drops out of df->blocks_to_analyze.  */
+  bool free_blocks_on_set_blocks;

 };
 
 
 };
 
 

-struct df
+/* The specific instance of the problem to solve.  */
+struct dataflow

 {
 {

-  int flags;                   /* Indicates what's recorded.  */
-  struct bb_info *bbs;         /* Basic block table.  */
-  struct ref **defs;           /* Def table, indexed by def_id.  */
-  struct ref **uses;           /* Use table, indexed by use_id.  */
-  struct ref **reg_def_last;   /* Indexed by regno.  */
-  struct reg_info *regs;       /* Regs table, index by regno.  */
-  unsigned int reg_size;       /* Size of regs table.  */
-  struct insn_info *insns;     /* Insn table, indexed by insn UID.  */
-  unsigned int insn_size;      /* Size of insn table.  */
-  unsigned int def_id;         /* Next def ID.  */
-  unsigned int def_size;       /* Size of def table.  */
-  unsigned int n_defs;         /* Size of def bitmaps.  */
-  unsigned int use_id;         /* Next use ID.  */
-  unsigned int use_size;       /* Size of use table.  */
-  unsigned int n_uses;         /* Size of use bitmaps.  */
-  unsigned int n_bbs;          /* Number of basic blocks.  */
-  unsigned int n_regs;         /* Number of regs.  */
-  unsigned int def_id_save;    /* Saved next def ID.  */
-  unsigned int use_id_save;    /* Saved next use ID.  */
-  bitmap insns_modified;       /* Insns that (may) have changed.  */
-  bitmap bbs_modified;         /* Blocks that (may) have changed.  */
-  bitmap all_blocks;           /* All blocks in CFG.  */
-  /* The sbitmap vector of dominators or NULL if not computed.
-     Ideally, this should be a pointer to a CFG object.  */
-  sbitmap *dom;
-  int *dfs_order;              /* DFS order -> block number.  */
-  int *rc_order;               /* Reverse completion order -> block number.  */
-  int *rts_order;              /* Reverse top sort order -> block number.  */
-  int *inverse_rc_map;         /* Block number -> reverse completion order.  */
-  int *inverse_dfs_map;                /* Block number -> DFS order.  */
-  int *inverse_rts_map;                /* Block number -> reverse top-sort order.  */
+  struct df_problem *problem;           /* The problem to be solved.  */
+
+  /* Array indexed by bb->index, that contains basic block problem and
+     solution specific information.  */
+  void **block_info;
+  unsigned int block_info_size;
+
+  /* The pool to allocate the block_info from. */
+  alloc_pool block_pool;                
+
+  /* The lr and live problems have their transfer functions recomputed
+     only if necessary.  This is possible for them because, the
+     problems are kept active for the entire backend and their
+     transfer functions are indexed by the REGNO.  These are not
+     defined for any other problem.  */
+  bitmap out_of_date_transfer_functions;
+
+  /* Other problem specific data that is not on a per basic block
+     basis.  The structure is generally defined privately for the
+     problem.  The exception being the scanning problem where it is
+     fully public.  */
+  void *problem_data;
+
+  /* Local flags for some of the problems. */
+  unsigned int local_flags;
+  
+  /* True if this problem of this instance has been initialized.  This
+     is used by the dumpers to keep garbage out of the dumps if, for
+     debugging a dump is produced before the first call to
+     df_analyze after a new problem is added.  */
+  bool computed;
+
+  /* True if the something has changed which invalidates the dataflow
+     solutions.  Note that this bit is always true for all problems except 
+     lr and live.  */
+  bool solutions_dirty;
+
+  /* If true, this pass is deleted by df_finish_pass.  This is never
+     true for DF_SCAN and DF_LR.  It is true for DF_LIVE if optimize >
+     1.  It is always true for the other problems.  */
+  bool optional_p;

 };
 
 
 };
 
 

-struct df_map
+/* The set of multiword hardregs used as operands to this
+   instruction. These are factored into individual uses and defs but
+   the aggregate is still needed to service the REG_DEAD and
+   REG_UNUSED notes.  */
+struct df_mw_hardreg

 {
 {

-  rtx old;
-  rtx new;
+  rtx mw_reg;                   /* The multiword hardreg.  */ 
+  /* These two bitfields are intentionally oversized, in the hope that
+     accesses to 16-bit fields will usually be quicker.  */
+  ENUM_BITFIELD(df_ref_type) type : 16;
+                               /* Used to see if the ref is read or write.  */
+  int flags : 16;              /* Various df_ref_flags.  */
+  unsigned int start_regno;     /* First word of the multi word subreg.  */
+  unsigned int end_regno;       /* Last word of the multi word subreg.  */
+  unsigned int mw_order;        /* Same as df_ref.ref_order.  */

 };
 };

+ 

 
 

+/* Define a register reference structure.  One of these is allocated
+    for every register reference (use or def).  Note some register
+    references (e.g., post_inc, subreg) generate both a def and a use.  */
+struct df_base_ref
+{
+  /* These three bitfields are intentionally oversized, in the hope that
+     accesses to 8 and 16-bit fields will usually be quicker.  */
+  ENUM_BITFIELD(df_ref_class) cl : 8;

 
 

-#define DF_BB_INFO(REFS, BB) (&REFS->bbs[(BB)->index])
-
+  ENUM_BITFIELD(df_ref_type) type : 8;
+                               /* Type of ref.  */
+  int flags : 16;              /* Various df_ref_flags.  */
+  rtx reg;                     /* The register referenced.  */
+  struct df_link *chain;       /* Head of def-use, use-def.  */
+  /* Pointer to the insn info of the containing instruction.  FIXME! 
+     Currently this is NULL for artificial refs but this will be used
+     when FUDs are added.  */ 
+  struct df_insn_info *insn_info;
+  /* For each regno, there are three chains of refs, one for the uses,
+     the eq_uses and the defs.  These chains go thru the refs
+     themselves rather than using an external structure.  */
+  union df_ref_d *next_reg;     /* Next ref with same regno and type.  */
+  union df_ref_d *prev_reg;     /* Prev ref with same regno and type.  */
+  unsigned int regno;          /* The register number referenced.  */
+  /* Location in the ref table.  This is only valid after a call to 
+     df_maybe_reorganize_[use,def]_refs which is an expensive operation.  */
+  int id;
+  /* The index at which the operand was scanned in the insn.  This is
+     used to totally order the refs in an insn.  */
+  unsigned int ref_order;
+};

 
 

-/* Macros to access the elements within the ref structure.  */

 
 

-#define DF_REF_REAL_REG(REF) (GET_CODE ((REF)->reg) == SUBREG \
-                               ? SUBREG_REG ((REF)->reg) : ((REF)->reg))
-#define DF_REF_REGNO(REF) REGNO (DF_REF_REAL_REG (REF))
-#define DF_REF_REAL_LOC(REF) (GET_CODE ((REF)->reg) == SUBREG \
-                               ? &SUBREG_REG ((REF)->reg) : ((REF)->loc))
-#define DF_REF_REG(REF) ((REF)->reg)
-#define DF_REF_LOC(REF) ((REF)->loc)
-#define DF_REF_BB(REF) (BLOCK_FOR_INSN ((REF)->insn))
-#define DF_REF_BBNO(REF) (BLOCK_FOR_INSN ((REF)->insn)->index)
-#define DF_REF_INSN(REF) ((REF)->insn)
-#define DF_REF_INSN_UID(REF) (INSN_UID ((REF)->insn))
-#define DF_REF_TYPE(REF) ((REF)->type)
-#define DF_REF_CHAIN(REF) ((REF)->chain)
-#define DF_REF_ID(REF) ((REF)->id)
-#define DF_REF_FLAGS(REF) ((REF)->flags)
+/* The three types of df_refs.  Note that the df_ref_extract is an
+   extension of the df_regular_ref, not the df_base_ref.  */  
+struct df_artificial_ref
+{
+  struct df_base_ref base;

 
 

-/* Macros to determine the reference type.  */
+  /* Artificial refs do not have an insn, so to get the basic block,
+     it must be explicitly here.  */
+  basic_block bb;
+};

 
 

-#define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
-#define DF_REF_REG_USE_P(REF) ((REF) && ! DF_REF_REG_DEF_P (REF))
-#define DF_REF_REG_MEM_STORE_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_STORE)
-#define DF_REF_REG_MEM_LOAD_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_LOAD)
-#define DF_REF_REG_MEM_P(REF) (DF_REF_REG_MEM_STORE_P (REF) \
-                               || DF_REF_REG_MEM_LOAD_P (REF))

 
 

+struct df_regular_ref
+{
+  struct df_base_ref base;
+  /* The loc is the address in the insn of the reg.  This is not
+     defined for special registers, such as clobbers and stack
+     pointers that are also associated with call insns and so those
+     just use the base.  */
+  rtx *loc;
+};

 
 

-/* Macros to access the elements within the reg_info structure table.  */

 
 

-#define DF_REGNO_FIRST_DEF(DF, REGNUM) \
-((DF)->regs[REGNUM].defs ? (DF)->regs[REGNUM].defs->ref : 0)
-#define DF_REGNO_LAST_USE(DF, REGNUM) \
-((DF)->regs[REGNUM].uses ? (DF)->regs[REGNUM].uses->ref : 0)
+/* A df_ref_extract is just a df_ref with a width and offset field at
+   the end of it.  It is used to hold this information if the ref was
+   wrapped by a SIGN_EXTRACT or a ZERO_EXTRACT and to pass this info
+   to passes that wish to process partial regs precisely.  */
+struct df_extract_ref
+{
+  struct df_regular_ref base;
+  int width;
+  int offset;
+  enum machine_mode mode;
+};

 
 

-#define DF_REGNO_FIRST_BB(DF, REGNUM) \
-(DF_REGNO_FIRST_DEF (DF, REGNUM) \
-? DF_REF_BB (DF_REGNO_FIRST_DEF (DF, REGNUM)) : 0)
-#define DF_REGNO_LAST_BB(DF, REGNUM) \
-(DF_REGNO_LAST_USE (DF, REGNUM) \
-? DF_REF_BB (DF_REGNO_LAST_USE (DF, REGNUM)) : 0)
+/* Union of the different kinds of defs/uses placeholders.  */
+union df_ref_d
+{
+  struct df_base_ref base;
+  struct df_regular_ref regular_ref;
+  struct df_artificial_ref artificial_ref;
+  struct df_extract_ref extract_ref;
+};
+typedef union df_ref_d *df_ref;

 
 
 
 

-/* Macros to access the elements within the insn_info structure table.  */
+/* One of these structures is allocated for every insn.  */
+struct df_insn_info
+{
+  rtx insn;                     /* The insn this info comes from.  */
+  df_ref *defs;                        /* Head of insn-def chain.  */
+  df_ref *uses;                        /* Head of insn-use chain.  */
+  /* Head of insn-use chain for uses in REG_EQUAL/EQUIV notes.  */
+  df_ref *eq_uses;       
+  struct df_mw_hardreg **mw_hardregs;
+  /* The logical uid of the insn in the basic block.  This is valid
+     after any call to df_analyze but may rot after insns are added,
+     deleted or moved. */
+  int luid; 
+};
+ 
+/* These links are used for ref-ref chains.  Currently only DEF-USE and
+   USE-DEF chains can be built by DF.  */
+struct df_link
+{
+  df_ref ref;
+  struct df_link *next;
+};

 
 

-#define DF_INSN_LUID(DF, INSN) ((DF)->insns[INSN_UID (INSN)].luid)
-#define DF_INSN_DEFS(DF, INSN) ((DF)->insns[INSN_UID (INSN)].defs)
-#define DF_INSN_USES(DF, INSN) ((DF)->insns[INSN_UID (INSN)].uses)
+\f
+enum df_chain_flags
+{
+  /* Flags that control the building of chains.  */
+  DF_DU_CHAIN      =  1, /* Build DU chains.  */  
+  DF_UD_CHAIN      =  2  /* Build UD chains.  */
+};

 
 

+enum df_changeable_flags 
+{
+  /* Scanning flags.  */
+  /* Flag to control the running of dce as a side effect of building LR.  */
+  DF_LR_RUN_DCE           = 1 << 0, /* Run DCE.  */
+  DF_NO_HARD_REGS         = 1 << 1, /* Skip hard registers in RD and CHAIN Building.  */

 
 

-/* Functions to build and analyze dataflow information.  */
+  DF_EQ_NOTES             = 1 << 2, /* Build chains with uses present in EQUIV/EQUAL notes. */
+  DF_NO_REGS_EVER_LIVE    = 1 << 3, /* Do not compute the regs_ever_live.  */

 
 

-extern struct df *df_init (void);
+  /* Cause df_insn_rescan df_notes_rescan and df_insn_delete, to
+  return immediately.  This is used by passes that know how to update
+  the scanning them selves.  */
+  DF_NO_INSN_RESCAN       = 1 << 4,

 
 

-extern int df_analyze (struct df *, bitmap, int);
+  /* Cause df_insn_rescan df_notes_rescan and df_insn_delete, to
+  return after marking the insn for later processing.  This allows all
+  rescans to be batched.  */
+  DF_DEFER_INSN_RESCAN    = 1 << 5,

 
 

-extern void df_finish (struct df *);
+  DF_VERIFY_SCHEDULED     = 1 << 6
+};

 
 

-extern void df_dump (struct df *, int, FILE *);
+/* Two of these structures are inline in df, one for the uses and one
+   for the defs.  This structure is only contains the refs within the
+   boundary of the df_set_blocks if that has been defined.  */
+struct df_ref_info
+{
+  df_ref *refs;                 /* Ref table, indexed by id.  */
+  unsigned int *begin;          /* First ref_index for this pseudo.  */
+  unsigned int *count;          /* Count of refs for this pseudo.  */
+  unsigned int refs_size;       /* Size of currently allocated refs table.  */
+
+  /* Table_size is the number of elements in the refs table.  This
+     will also be the width of the bitvectors in the rd and ru
+     problems.  Total_size is the number of refs.  These will be the
+     same if the focus has not been reduced by df_set_blocks.  If the
+     focus has been reduced, table_size will be smaller since it only
+     contains the refs in the set blocks.  */
+  unsigned int table_size;
+  unsigned int total_size;
+
+  enum df_ref_order ref_order;
+};

 
 

+/* Three of these structures are allocated for every pseudo reg. One
+   for the uses, one for the eq_uses and one for the defs.  */
+struct df_reg_info
+{
+  /* Head of chain for refs of that type and regno.  */
+  df_ref reg_chain;
+  /* Number of refs in the chain.  */
+  unsigned int n_refs;
+};

 
 

-/* Functions to modify insns.  */

 
 

-extern void df_insn_modify (struct df *, basic_block, rtx);
+/*----------------------------------------------------------------------------
+   Problem data for the scanning dataflow problem.  Unlike the other
+   dataflow problems, the problem data for scanning is fully exposed and
+   used by owners of the problem.
+----------------------------------------------------------------------------*/

 
 

-extern rtx df_insn_delete (struct df *, basic_block, rtx);
+struct df
+{

 
 

-extern rtx df_pattern_emit_before (struct df *, rtx, basic_block, rtx);
+  /* The set of problems to be solved is stored in two arrays.  In
+     PROBLEMS_IN_ORDER, the problems are stored in the order that they
+     are solved.  This is an internally dense array that may have
+     nulls at the end of it.  In PROBLEMS_BY_INDEX, the problem is
+     stored by the value in df_problem.id.  These are used to access
+     the problem local data without having to search the first
+     array.  */
+
+  struct dataflow *problems_in_order[DF_LAST_PROBLEM_PLUS1]; 
+  struct dataflow *problems_by_index[DF_LAST_PROBLEM_PLUS1]; 
+
+  /* If not NULL, this subset of blocks of the program to be
+     considered for analysis.  At certain times, this will contain all
+     the blocks in the function so it cannot be used as an indicator
+     of if we are analyzing a subset.  See analyze_subset.  */ 
+  bitmap blocks_to_analyze;
+
+  /* The following information is really the problem data for the
+     scanning instance but it is used too often by the other problems
+     to keep getting it from there.  */
+  struct df_ref_info def_info;   /* Def info.  */
+  struct df_ref_info use_info;   /* Use info.  */
+
+  /* The following three arrays are allocated in parallel.   They contain
+     the sets of refs of each type for each reg.  */
+  struct df_reg_info **def_regs;       /* Def reg info.  */
+  struct df_reg_info **use_regs;       /* Eq_use reg info.  */
+  struct df_reg_info **eq_use_regs;    /* Eq_use info.  */
+  unsigned int regs_size;       /* Size of currently allocated regs table.  */
+  unsigned int regs_inited;     /* Number of regs with reg_infos allocated.  */
+
+
+  struct df_insn_info **insns;   /* Insn table, indexed by insn UID.  */
+  unsigned int insns_size;       /* Size of insn table.  */
+
+  int num_problems_defined;
+
+  bitmap hardware_regs_used;     /* The set of hardware registers used.  */
+  /* The set of hard regs that are in the artificial uses at the end
+     of a regular basic block.  */
+  bitmap regular_block_artificial_uses;
+  /* The set of hard regs that are in the artificial uses at the end
+     of a basic block that has an EH pred.  */
+  bitmap eh_block_artificial_uses;
+  /* The set of hardware registers live on entry to the function.  */
+  bitmap entry_block_defs;
+  bitmap exit_block_uses;        /* The set of hardware registers used in exit block.  */
+
+  /* Insns to delete, rescan or reprocess the notes at next
+     df_rescan_all or df_process_deferred_rescans. */
+  bitmap insns_to_delete;
+  bitmap insns_to_rescan;
+  bitmap insns_to_notes_rescan;
+  int *postorder;                /* The current set of basic blocks 
+                                    in reverse postorder.  */
+  int *postorder_inverted;       /* The current set of basic blocks 
+                                    in reverse postorder of inverted CFG.  */
+  int n_blocks;                  /* The number of blocks in reverse postorder.  */
+  int n_blocks_inverted;         /* The number of blocks 
+                                    in reverse postorder of inverted CFG.  */
+
+  /* An array [FIRST_PSEUDO_REGISTER], indexed by regno, of the number
+     of refs that qualify as being real hard regs uses.  Artificial
+     uses and defs as well as refs in eq notes are ignored.  If the
+     ref is a def, it cannot be a MAY_CLOBBER def.  If the ref is a
+     use, it cannot be the emim_reg_set or be the frame or arg pointer
+     register.
+
+     IT IS NOT ACCEPTABLE TO MANUALLY CHANGE THIS ARRAY.  This array
+     always reflects the actual number of refs in the insn stream that
+     satisfy the above criteria.  */
+  unsigned int *hard_regs_live_count;
+
+  /* This counter provides a way to totally order refs without using
+     addresses.  It is incremented whenever a ref is created.  */
+  unsigned int ref_order;
+
+  /* Problem specific control information.  This is a combination of
+     enum df_changeable_flags values.  */
+  int changeable_flags : 8;
+
+  /* If this is true, then only a subset of the blocks of the program
+     is considered to compute the solutions of dataflow problems.  */
+  bool analyze_subset;
+
+  /* True if someone added or deleted something from regs_ever_live so
+     that the entry and exit blocks need be reprocessed.  */
+  bool redo_entry_and_exit;
+};

 
 

-extern rtx df_jump_pattern_emit_after (struct df *, rtx, basic_block, rtx);
+#define DF_SCAN_BB_INFO(BB) (df_scan_get_bb_info((BB)->index))
+#define DF_RD_BB_INFO(BB) (df_rd_get_bb_info((BB)->index))
+#define DF_LR_BB_INFO(BB) (df_lr_get_bb_info((BB)->index))
+#define DF_LIVE_BB_INFO(BB) (df_live_get_bb_info((BB)->index))
+#define DF_BYTE_LR_BB_INFO(BB) (df_byte_lr_get_bb_info((BB)->index))
+
+/* Most transformations that wish to use live register analysis will
+   use these macros.  This info is the and of the lr and live sets.  */
+#define DF_LIVE_IN(BB) (DF_LIVE_BB_INFO(BB)->in) 
+#define DF_LIVE_OUT(BB) (DF_LIVE_BB_INFO(BB)->out) 
+
+/* These macros are used by passes that are not tolerant of
+   uninitialized variables.  This intolerance should eventually
+   be fixed.  */
+#define DF_LR_IN(BB) (DF_LR_BB_INFO(BB)->in) 
+#define DF_LR_OUT(BB) (DF_LR_BB_INFO(BB)->out) 
+
+/* These macros are used by passes that are not tolerant of
+   uninitialized variables.  This intolerance should eventually
+   be fixed.  */
+#define DF_BYTE_LR_IN(BB) (DF_BYTE_LR_BB_INFO(BB)->in) 
+#define DF_BYTE_LR_OUT(BB) (DF_BYTE_LR_BB_INFO(BB)->out) 

 
 

-extern rtx df_pattern_emit_after (struct df *, rtx, basic_block, rtx);
+/* Macros to access the elements within the ref structure.  */

 
 

-extern rtx df_insn_move_before (struct df *, basic_block, rtx, basic_block,
-                               rtx);

 
 

-extern int df_reg_replace (struct df *, bitmap, rtx, rtx);
+#define DF_REF_REAL_REG(REF) (GET_CODE ((REF)->base.reg) == SUBREG \
+                               ? SUBREG_REG ((REF)->base.reg) : ((REF)->base.reg))
+#define DF_REF_REGNO(REF) ((REF)->base.regno)
+#define DF_REF_REAL_LOC(REF) (GET_CODE (*((REF)->regular_ref.loc)) == SUBREG \
+                               ? &SUBREG_REG (*((REF)->regular_ref.loc)) : ((REF)->regular_ref.loc))
+#define DF_REF_REG(REF) ((REF)->base.reg)
+#define DF_REF_LOC(REF) ((DF_REF_CLASS(REF) == DF_REF_REGULAR || DF_REF_CLASS(REF) == DF_REF_EXTRACT) ? \
+                        (REF)->regular_ref.loc : NULL)
+#define DF_REF_BB(REF) (DF_REF_IS_ARTIFICIAL(REF) ? \
+                        (REF)->artificial_ref.bb : BLOCK_FOR_INSN (DF_REF_INSN(REF)))
+#define DF_REF_BBNO(REF) (DF_REF_BB (REF)->index)
+#define DF_REF_INSN_INFO(REF) ((REF)->base.insn_info)
+#define DF_REF_INSN(REF) ((REF)->base.insn_info->insn)
+#define DF_REF_INSN_UID(REF) (INSN_UID (DF_REF_INSN(REF)))
+#define DF_REF_CLASS(REF) ((REF)->base.cl)
+#define DF_REF_TYPE(REF) ((REF)->base.type)
+#define DF_REF_CHAIN(REF) ((REF)->base.chain)
+#define DF_REF_ID(REF) ((REF)->base.id)
+#define DF_REF_FLAGS(REF) ((REF)->base.flags)
+#define DF_REF_FLAGS_IS_SET(REF, v) ((DF_REF_FLAGS (REF) & (v)) != 0)
+#define DF_REF_FLAGS_SET(REF, v) (DF_REF_FLAGS (REF) |= (v))
+#define DF_REF_FLAGS_CLEAR(REF, v) (DF_REF_FLAGS (REF) &= ~(v))
+#define DF_REF_ORDER(REF) ((REF)->base.ref_order)
+/* If DF_REF_IS_ARTIFICIAL () is true, this is not a real
+   definition/use, but an artificial one created to model always live
+   registers, eh uses, etc.  */
+#define DF_REF_IS_ARTIFICIAL(REF) (DF_REF_CLASS(REF) == DF_REF_ARTIFICIAL)
+#define DF_REF_REG_MARK(REF) (DF_REF_FLAGS_SET ((REF),DF_REF_REG_MARKER))
+#define DF_REF_REG_UNMARK(REF) (DF_REF_FLAGS_CLEAR ((REF),DF_REF_REG_MARKER))
+#define DF_REF_IS_REG_MARKED(REF) (DF_REF_FLAGS_IS_SET ((REF),DF_REF_REG_MARKER))
+#define DF_REF_NEXT_REG(REF) ((REF)->base.next_reg)
+#define DF_REF_PREV_REG(REF) ((REF)->base.prev_reg)
+/* The following two macros may only be applied if one of 
+   DF_REF_SIGN_EXTRACT | DF_REF_ZERO_EXTRACT is true. */ 
+#define DF_REF_EXTRACT_WIDTH(REF) ((REF)->extract_ref.width)
+#define DF_REF_EXTRACT_OFFSET(REF) ((REF)->extract_ref.offset)
+#define DF_REF_EXTRACT_MODE(REF) ((REF)->extract_ref.mode)

 
 

-extern int df_ref_reg_replace (struct df *, struct ref *, rtx, rtx);
+/* Macros to determine the reference type.  */
+#define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
+#define DF_REF_REG_USE_P(REF) ((REF) && !DF_REF_REG_DEF_P (REF))
+#define DF_REF_REG_MEM_STORE_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_STORE)
+#define DF_REF_REG_MEM_LOAD_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_LOAD)
+#define DF_REF_REG_MEM_P(REF) (DF_REF_REG_MEM_STORE_P (REF) \
+                               || DF_REF_REG_MEM_LOAD_P (REF))

 
 

-extern int df_ref_remove (struct df *, struct ref *);
+#define DF_MWS_REG_DEF_P(MREF) (DF_MWS_TYPE (MREF) == DF_REF_REG_DEF)
+#define DF_MWS_REG_USE_P(MREF) ((MREF) && !DF_MWS_REG_DEF_P (MREF))
+#define DF_MWS_TYPE(MREF) ((MREF)->type)
+
+/* Macros to get the refs out of def_info or use_info refs table.  If
+   the focus of the dataflow has been set to some subset of blocks
+   with df_set_blocks, these macros will only find the uses and defs
+   in that subset of blocks.  
+
+   These macros should be used with care.  The def macros are only
+   usable after a call to df_maybe_reorganize_def_refs and the use
+   macros are only usable after a call to
+   df_maybe_reorganize_use_refs.  HOWEVER, BUILDING AND USING THESE
+   ARRAYS ARE A CACHE LOCALITY KILLER.  */
+
+#define DF_DEFS_TABLE_SIZE() (df->def_info.table_size)
+#define DF_DEFS_GET(ID) (df->def_info.refs[(ID)])
+#define DF_DEFS_SET(ID,VAL) (df->def_info.refs[(ID)]=(VAL))
+#define DF_DEFS_COUNT(ID) (df->def_info.count[(ID)])
+#define DF_DEFS_BEGIN(ID) (df->def_info.begin[(ID)])
+#define DF_USES_TABLE_SIZE() (df->use_info.table_size)
+#define DF_USES_GET(ID) (df->use_info.refs[(ID)])
+#define DF_USES_SET(ID,VAL) (df->use_info.refs[(ID)]=(VAL))
+#define DF_USES_COUNT(ID) (df->use_info.count[(ID)])
+#define DF_USES_BEGIN(ID) (df->use_info.begin[(ID)])
+
+/* Macros to access the register information from scan dataflow record.  */
+
+#define DF_REG_SIZE(DF) (df->regs_inited)
+#define DF_REG_DEF_GET(REG) (df->def_regs[(REG)])
+#define DF_REG_DEF_CHAIN(REG) (df->def_regs[(REG)]->reg_chain)
+#define DF_REG_DEF_COUNT(REG) (df->def_regs[(REG)]->n_refs)
+#define DF_REG_USE_GET(REG) (df->use_regs[(REG)])
+#define DF_REG_USE_CHAIN(REG) (df->use_regs[(REG)]->reg_chain)
+#define DF_REG_USE_COUNT(REG) (df->use_regs[(REG)]->n_refs)
+#define DF_REG_EQ_USE_GET(REG) (df->eq_use_regs[(REG)])
+#define DF_REG_EQ_USE_CHAIN(REG) (df->eq_use_regs[(REG)]->reg_chain)
+#define DF_REG_EQ_USE_COUNT(REG) (df->eq_use_regs[(REG)]->n_refs)

 
 

-extern int df_insn_reg_replace (struct df *, basic_block, rtx, rtx, rtx);
+/* Macros to access the elements within the reg_info structure table.  */

 
 

-extern int df_insn_mem_replace (struct df *, basic_block, rtx, rtx, rtx);
+#define DF_REGNO_FIRST_DEF(REGNUM) \
+(DF_REG_DEF_GET(REGNUM) ? DF_REG_DEF_GET(REGNUM) : 0)
+#define DF_REGNO_LAST_USE(REGNUM) \
+(DF_REG_USE_GET(REGNUM) ? DF_REG_USE_GET(REGNUM) : 0)

 
 

-extern struct ref *df_bb_def_use_swap (struct df *, basic_block, rtx, rtx,
-                                      unsigned int);
+/* Macros to access the elements within the insn_info structure table.  */

 
 

+#define DF_INSN_SIZE() ((df)->insns_size)
+#define DF_INSN_INFO_GET(INSN) (df->insns[(INSN_UID(INSN))])
+#define DF_INSN_INFO_SET(INSN,VAL) (df->insns[(INSN_UID (INSN))]=(VAL))
+#define DF_INSN_INFO_LUID(II) ((II)->luid)
+#define DF_INSN_INFO_DEFS(II) ((II)->defs)
+#define DF_INSN_INFO_USES(II) ((II)->uses)
+#define DF_INSN_INFO_EQ_USES(II) ((II)->eq_uses)
+
+#define DF_INSN_LUID(INSN) (DF_INSN_INFO_LUID (DF_INSN_INFO_GET(INSN)))
+#define DF_INSN_DEFS(INSN) (DF_INSN_INFO_DEFS (DF_INSN_INFO_GET(INSN)))
+#define DF_INSN_USES(INSN) (DF_INSN_INFO_USES (DF_INSN_INFO_GET(INSN)))
+#define DF_INSN_EQ_USES(INSN) (DF_INSN_INFO_EQ_USES (DF_INSN_INFO_GET(INSN)))
+
+#define DF_INSN_UID_GET(UID) (df->insns[(UID)])
+#define DF_INSN_UID_SET(UID,VAL) (df->insns[(UID)]=(VAL))
+#define DF_INSN_UID_SAFE_GET(UID) (((unsigned)(UID) < DF_INSN_SIZE())  \
+                                     ? DF_INSN_UID_GET (UID) \
+                                     : NULL)
+#define DF_INSN_UID_LUID(INSN) (DF_INSN_UID_GET(INSN)->luid)
+#define DF_INSN_UID_DEFS(INSN) (DF_INSN_UID_GET(INSN)->defs)
+#define DF_INSN_UID_USES(INSN) (DF_INSN_UID_GET(INSN)->uses)
+#define DF_INSN_UID_EQ_USES(INSN) (DF_INSN_UID_GET(INSN)->eq_uses)
+#define DF_INSN_UID_MWS(INSN) (DF_INSN_UID_GET(INSN)->mw_hardregs)
+
+/* An obstack for bitmap not related to specific dataflow problems.
+   This obstack should e.g. be used for bitmaps with a short life time
+   such as temporary bitmaps.  This obstack is declared in df-core.c.  */
+
+extern bitmap_obstack df_bitmap_obstack;

 
 

-/* Functions to query dataflow information.  */

 
 

-extern basic_block df_regno_bb (struct df *, unsigned int);
+/* One of these structures is allocated for every basic block.  */
+struct df_scan_bb_info
+{
+  /* The entry block has many artificial defs and these are at the
+     bottom of the block.

 
 

-extern int df_reg_lifetime (struct df *, rtx);
+     Blocks that are targets of exception edges may have some
+     artificial defs.  These are logically located at the top of the
+     block.

 
 

-extern int df_reg_global_p (struct df *, rtx);
+     Blocks that are the targets of non-local goto's have the hard
+     frame pointer defined at the top of the block.  */
+  df_ref *artificial_defs;

 
 

-extern int df_insn_regno_def_p (struct df *, basic_block, rtx, unsigned int);
+  /* Blocks that are targets of exception edges may have some
+     artificial uses.  These are logically at the top of the block.

 
 

-extern int df_insn_dominates_all_uses_p (struct df *, basic_block, rtx);
+     Most blocks have artificial uses at the bottom of the block.  */
+  df_ref *artificial_uses;
+};

 
 

-extern int df_insn_dominates_uses_p (struct df *, basic_block, rtx, bitmap);

 
 

-extern int df_bb_reg_live_start_p (struct df *, basic_block, rtx);
+/* Reaching definitions.  All bitmaps are indexed by the id field of
+   the ref except sparse_kill which is indexed by regno.  */
+struct df_rd_bb_info 
+{
+  /* Local sets to describe the basic blocks.   */
+  bitmap kill;  
+  bitmap sparse_kill;
+  bitmap gen;   /* The set of defs generated in this block.  */
+
+  /* The results of the dataflow problem.  */
+  bitmap in;    /* At the top of the block.  */
+  bitmap out;   /* At the bottom of the block.  */
+};

 
 

-extern int df_bb_reg_live_end_p (struct df *, basic_block, rtx);

 
 

-extern int df_bb_regs_lives_compare (struct df *, basic_block, rtx, rtx);
+/* Live registers, a backwards dataflow problem.  All bitmaps are
+   referenced by the register number.  */

 
 

-extern rtx df_bb_single_def_use_insn_find (struct df *, basic_block, rtx,
-                                          rtx);
-extern struct ref *df_bb_regno_last_use_find (struct df *, basic_block, unsigned int);
+struct df_lr_bb_info 
+{
+  /* Local sets to describe the basic blocks.  */
+  bitmap def;   /* The set of registers set in this block 
+                   - except artificial defs at the top.  */
+  bitmap use;   /* The set of registers used in this block.  */
+
+  /* The results of the dataflow problem.  */
+  bitmap in;    /* Just before the block itself. */
+  bitmap out;   /* At the bottom of the block.  */
+};

 
 

-extern struct ref *df_bb_regno_first_def_find (struct df *, basic_block, unsigned int);

 
 

-extern struct ref *df_bb_regno_last_def_find (struct df *, basic_block, unsigned int);
+/* Uninitialized registers.  All bitmaps are referenced by the
+   register number.  Anded results of the forwards and backward live
+   info.  Note that the forwards live information is not available
+   separately.  */
+struct df_live_bb_info 
+{
+  /* Local sets to describe the basic blocks.  */
+  bitmap kill;  /* The set of registers unset in this block.  Calls,
+                  for instance, unset registers.  */
+  bitmap gen;   /* The set of registers set in this block.  */
+
+  /* The results of the dataflow problem.  */
+  bitmap in;    /* At the top of the block.  */
+  bitmap out;   /* At the bottom of the block.  */
+};

 
 

-extern struct ref *df_find_def (struct df *, rtx, rtx);

 
 

-extern int df_reg_used (struct df *, rtx, rtx);
+/* Live registers, a backwards dataflow problem.  These bitmaps are
+indexed by the df_byte_lr_offset array which is indexed by pseudo.  */

 
 

+struct df_byte_lr_bb_info 
+{
+  /* Local sets to describe the basic blocks.  */
+  bitmap def;   /* The set of registers set in this block 
+                   - except artificial defs at the top.  */
+  bitmap use;   /* The set of registers used in this block.  */
+
+  /* The results of the dataflow problem.  */
+  bitmap in;    /* Just before the block itself. */
+  bitmap out;   /* At the bottom of the block.  */
+};

 
 

-/* Functions for debugging from GDB.  */

 
 

+/* This is used for debugging and for the dumpers to find the latest
+   instance so that the df info can be added to the dumps.  This
+   should not be used by regular code.  */ 
+extern struct df *df;
+#define df_scan    (df->problems_by_index[DF_SCAN])
+#define df_rd      (df->problems_by_index[DF_RD])
+#define df_lr      (df->problems_by_index[DF_LR])
+#define df_live    (df->problems_by_index[DF_LIVE])
+#define df_chain   (df->problems_by_index[DF_CHAIN])
+#define df_byte_lr (df->problems_by_index[DF_BYTE_LR])
+#define df_note    (df->problems_by_index[DF_NOTE])
+
+/* This symbol turns on checking that each modification of the cfg has
+  been identified to the appropriate df routines.  It is not part of
+  verification per se because the check that the final solution has
+  not changed covers this.  However, if the solution is not being
+  properly recomputed because the cfg is being modified, adding in
+  calls to df_check_cfg_clean can be used to find the source of that
+  kind of problem.  */
+#if 0
+#define DF_DEBUG_CFG
+#endif
+
+
+/* Functions defined in df-core.c.  */
+
+extern void df_add_problem (struct df_problem *);
+extern int df_set_flags (int);
+extern int df_clear_flags (int);
+extern void df_set_blocks (bitmap);
+extern void df_remove_problem (struct dataflow *);
+extern void df_finish_pass (bool);
+extern void df_analyze_problem (struct dataflow *, bitmap, int *, int);
+extern void df_analyze (void);
+extern int df_get_n_blocks (enum df_flow_dir);
+extern int *df_get_postorder (enum df_flow_dir);
+extern void df_simple_dataflow (enum df_flow_dir, df_init_function,
+                               df_confluence_function_0, df_confluence_function_n,
+                               df_transfer_function, bitmap, int *, int);
+extern void df_mark_solutions_dirty (void);
+extern bool df_get_bb_dirty (basic_block);
+extern void df_set_bb_dirty (basic_block);
+extern void df_compact_blocks (void);
+extern void df_bb_replace (int, basic_block);
+extern void df_bb_delete (int);
+extern void df_verify (void);
+#ifdef DF_DEBUG_CFG
+extern void df_check_cfg_clean (void);
+#endif
+extern df_ref df_bb_regno_first_def_find (basic_block, unsigned int);
+extern df_ref df_bb_regno_last_def_find (basic_block, unsigned int);
+extern df_ref df_find_def (rtx, rtx);
+extern bool df_reg_defined (rtx, rtx);
+extern df_ref df_find_use (rtx, rtx);
+extern bool df_reg_used (rtx, rtx);
+extern void df_worklist_dataflow (struct dataflow *,bitmap, int *, int);
+extern void df_print_regset (FILE *file, bitmap r);
+extern void df_print_byte_regset (FILE *file, bitmap r);
+extern void df_dump (FILE *);
+extern void df_dump_region (FILE *);
+extern void df_dump_start (FILE *);
+extern void df_dump_top (basic_block, FILE *);
+extern void df_dump_bottom (basic_block, FILE *);
+extern void df_refs_chain_dump (df_ref *, bool, FILE *);
+extern void df_regs_chain_dump (df_ref,  FILE *);
+extern void df_insn_debug (rtx, bool, FILE *);
+extern void df_insn_debug_regno (rtx, FILE *);
+extern void df_regno_debug (unsigned int, FILE *);
+extern void df_ref_debug (df_ref, FILE *);

 extern void debug_df_insn (rtx);
 extern void debug_df_insn (rtx);

-

 extern void debug_df_regno (unsigned int);
 extern void debug_df_regno (unsigned int);

-

 extern void debug_df_reg (rtx);
 extern void debug_df_reg (rtx);

-

 extern void debug_df_defno (unsigned int);
 extern void debug_df_defno (unsigned int);

-

 extern void debug_df_useno (unsigned int);
 extern void debug_df_useno (unsigned int);

-
-extern void debug_df_ref (struct ref *);
-
+extern void debug_df_ref (df_ref);

 extern void debug_df_chain (struct df_link *);
 
 extern void debug_df_chain (struct df_link *);
 

-extern void df_insn_debug (struct df *, rtx, FILE *);
-
-extern void df_insn_debug_regno (struct df *, rtx, FILE *);
+/* Functions defined in df-problems.c. */
+
+extern struct df_link *df_chain_create (df_ref, df_ref);
+extern void df_chain_unlink (df_ref);
+extern void df_chain_copy (df_ref, struct df_link *);
+extern bitmap df_get_live_in (basic_block);
+extern bitmap df_get_live_out (basic_block);
+extern void df_grow_bb_info (struct dataflow *);
+extern void df_chain_dump (struct df_link *, FILE *);
+extern void df_print_bb_index (basic_block bb, FILE *file);
+extern void df_rd_add_problem (void);
+extern void df_rd_simulate_artificial_defs_at_top (basic_block, bitmap);
+extern void df_rd_simulate_one_insn (basic_block, rtx, bitmap);
+extern void df_lr_add_problem (void);
+extern void df_lr_verify_transfer_functions (void);
+extern void df_live_verify_transfer_functions (void);
+extern void df_live_add_problem (void);
+extern void df_live_set_all_dirty (void);
+extern void df_chain_add_problem (unsigned int);
+extern void df_byte_lr_add_problem (void);
+extern int df_byte_lr_get_regno_start (unsigned int);
+extern int df_byte_lr_get_regno_len (unsigned int);
+extern void df_byte_lr_simulate_defs (rtx, bitmap);
+extern void df_byte_lr_simulate_uses (rtx, bitmap);
+extern void df_byte_lr_simulate_artificial_refs_at_top (basic_block, bitmap);
+extern void df_byte_lr_simulate_artificial_refs_at_end (basic_block, bitmap);
+extern void df_note_add_problem (void);
+extern void df_simulate_find_defs (rtx, bitmap);
+extern void df_simulate_defs (rtx, bitmap);
+extern void df_simulate_uses (rtx, bitmap);
+extern void df_simulate_initialize_backwards (basic_block, bitmap);
+extern void df_simulate_one_insn_backwards (basic_block, rtx, bitmap);
+extern void df_simulate_finalize_backwards (basic_block, bitmap);
+extern void df_simulate_initialize_forwards (basic_block, bitmap);
+extern void df_simulate_one_insn_forwards (basic_block, rtx, bitmap);
+extern void df_simulate_finalize_forwards (basic_block, bitmap);
+
+/* Functions defined in df-scan.c.  */
+
+extern void df_scan_alloc (bitmap);
+extern void df_scan_add_problem (void);
+extern void df_grow_reg_info (void);
+extern void df_grow_insn_info (void);
+extern void df_scan_blocks (void);
+extern df_ref df_ref_create (rtx, rtx *, rtx,basic_block, 
+                                    enum df_ref_type, int ref_flags,
+                                    int, int, enum machine_mode);
+extern void df_ref_remove (df_ref);
+extern struct df_insn_info * df_insn_create_insn_record (rtx);
+extern void df_insn_delete (basic_block, unsigned int);
+extern void df_bb_refs_record (int, bool);
+extern bool df_insn_rescan (rtx);
+extern void df_insn_rescan_all (void);
+extern void df_process_deferred_rescans (void);
+extern void df_recompute_luids (basic_block);
+extern void df_insn_change_bb (rtx, basic_block);
+extern void df_maybe_reorganize_use_refs (enum df_ref_order);
+extern void df_maybe_reorganize_def_refs (enum df_ref_order);
+extern void df_ref_change_reg_with_loc (int, int, rtx);
+extern void df_notes_rescan (rtx);
+extern void df_hard_reg_init (void);
+extern void df_update_entry_block_defs (void);
+extern void df_update_exit_block_uses (void);
+extern void df_update_entry_exit_and_calls (void);
+extern bool df_hard_reg_used_p (unsigned int);
+extern unsigned int df_hard_reg_used_count (unsigned int);
+extern bool df_regs_ever_live_p (unsigned int);
+extern void df_set_regs_ever_live (unsigned int, bool);
+extern void df_compute_regs_ever_live (bool);
+extern bool df_read_modify_subreg_p (rtx);
+extern void df_scan_verify (void);
+
+/* Functions defined in df-byte-scan.c.  */
+extern bool df_compute_accessed_bytes (df_ref, enum df_mm, 
+                                      unsigned int *, unsigned int *);
+
+
+/* Get basic block info.  */
+
+static inline struct df_scan_bb_info *
+df_scan_get_bb_info (unsigned int index)
+{
+  if (index < df_scan->block_info_size)
+    return (struct df_scan_bb_info *) df_scan->block_info[index];
+  else
+    return NULL;
+}
+
+static inline struct df_rd_bb_info *
+df_rd_get_bb_info (unsigned int index)
+{
+  if (index < df_rd->block_info_size)
+    return (struct df_rd_bb_info *) df_rd->block_info[index];
+  else
+    return NULL;
+}
+
+static inline struct df_lr_bb_info *
+df_lr_get_bb_info (unsigned int index)
+{
+  if (index < df_lr->block_info_size)
+    return (struct df_lr_bb_info *) df_lr->block_info[index];
+  else
+    return NULL;
+}
+
+static inline struct df_live_bb_info *
+df_live_get_bb_info (unsigned int index)
+{
+  if (index < df_live->block_info_size)
+    return (struct df_live_bb_info *) df_live->block_info[index];
+  else
+    return NULL;
+}
+
+static inline struct df_byte_lr_bb_info *
+df_byte_lr_get_bb_info (unsigned int index)
+{
+  if (index < df_byte_lr->block_info_size)
+    return (struct df_byte_lr_bb_info *) df_byte_lr->block_info[index];
+  else
+    return NULL;
+}

 
 

+/* Get the artificial defs for a basic block.  */

 
 

-/* Meet over any path (UNION) or meet over all paths (INTERSECTION).  */
-enum df_confluence_op
-  {
-    DF_UNION,
-    DF_INTERSECTION
-  };
+static inline df_ref *
+df_get_artificial_defs (unsigned int bb_index)
+{
+  return df_scan_get_bb_info (bb_index)->artificial_defs;
+}

 
 
 
 

-/* Dataflow direction.  */
-enum df_flow_dir
-  {
-    DF_FORWARD,
-    DF_BACKWARD
-  };
+/* Get the artificial uses for a basic block.  */

 
 

+static inline df_ref *
+df_get_artificial_uses (unsigned int bb_index)
+{
+  return df_scan_get_bb_info (bb_index)->artificial_uses;
+}

 
 

-typedef void (*transfer_function_sbitmap) (int, int *, sbitmap, sbitmap,
-                                          sbitmap, sbitmap, void *);

 
 

-typedef void (*transfer_function_bitmap) (int, int *, bitmap, bitmap,
-                                         bitmap, bitmap, void *);
+/* web */

 
 

-extern void iterative_dataflow_sbitmap (sbitmap *, sbitmap *, sbitmap *,
-                                       sbitmap *, bitmap, enum df_flow_dir,
-                                       enum df_confluence_op,
-                                       transfer_function_sbitmap,
-                                       int *, void *);
+/* This entry is allocated for each reference in the insn stream.  */
+struct web_entry
+{
+  /* Pointer to the parent in the union/find tree.  */
+  struct web_entry *pred;
+  /* Newly assigned register to the entry.  Set only for roots.  */
+  rtx reg;
+  void* extra_info;
+};

 
 

-extern void iterative_dataflow_bitmap (bitmap *, bitmap *, bitmap *,
-                                      bitmap *, bitmap,
-                                      enum df_flow_dir,
-                                      enum df_confluence_op,
-                                      transfer_function_bitmap,
-                                      int *, void *);
-extern bool read_modify_subreg_p (rtx);
+extern struct web_entry *unionfind_root (struct web_entry *);
+extern bool unionfind_union (struct web_entry *, struct web_entry *);
+extern void union_defs (df_ref,
+                        struct web_entry *, struct web_entry *,
+                       bool (*fun) (struct web_entry *, struct web_entry *));

 
 #endif /* GCC_DF_H */
 
 #endif /* GCC_DF_H */