gcc/integrate.h

   1 /* Function integration definitions for GNU C-Compiler
   2    Copyright (C) 1990, 1995, 1998 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* This structure is used to remap objects in the function being inlined to
  22    those belonging to the calling function.  It is passed by
  23    expand_inline_function to its children.
  24
  25    This structure is also used when unrolling loops and otherwise
  26    replicating code, although not all fields are needed in this case;
  27    only those fields needed by copy_rtx_and_substitute() and its children
  28    are used.
  29
  30    This structure is used instead of static variables because
  31    expand_inline_function may be called recursively via expand_expr.  */
  32
  33 struct inline_remap
  34 {
  35   /* True if we are doing function integration, false otherwise.
  36      Used to control whether RTX_UNCHANGING bits are copied by
  37      copy_rtx_and_substitute. */
  38   int integrating;
  39   /* Definition of function be inlined.  */
  40   union tree_node *fndecl;
  41   /* Place to put insns needed at start of function.  */
  42   rtx insns_at_start;
  43   /* Mapping from old registers to new registers.
  44      It is allocated and deallocated in `expand_inline_function' */
  45   rtx *reg_map;
  46   /* Mapping from old code-labels to new code-labels.
  47      The first element of this map is label_map[min_labelno].  */
  48   rtx *label_map;
  49   /* Mapping from old insn uid's to copied insns.  The first element
  50    of this map is insn_map[min_insnno]; the last element is
  51    insn_map[max_insnno].  We keep the bounds here for when the map
  52    only covers a partial range of insns (such as loop unrolling or
  53    code replication).  */
  54   rtx *insn_map;
  55   int min_insnno, max_insnno;
  56
  57   /* Map pseudo reg number in calling function to equivalent constant.  We
  58      cannot in general substitute constants into parameter pseudo registers,
  59      since some machine descriptions (many RISCs) won't always handle
  60      the resulting insns.  So if an incoming parameter has a constant
  61      equivalent, we record it here, and if the resulting insn is
  62      recognizable, we go with it.
  63
  64      We also use this mechanism to convert references to incoming arguments
  65      and stacked variables.  copy_rtx_and_substitute will replace the virtual
  66      incoming argument and virtual stacked variables registers with new
  67      pseudos that contain pointers into the replacement area allocated for
  68      this inline instance.  These pseudos are then marked as being equivalent
  69      to the appropriate address and substituted if valid.  */
  70   rtx *const_equiv_map;
  71   /* Number of entries in const_equiv_map and const_arg_map.  */
  72   int const_equiv_map_size;
  73   /* This is incremented for each new basic block.
  74      It is used to store in const_age_map to record the domain of validity
  75      of each entry in const_equiv_map.
  76      A value of -1 indicates an entry for a reg which is a parm.
  77      All other values are "positive".  */
  78 #define CONST_AGE_PARM (-1)
  79   unsigned int const_age;
  80   /* In parallel with const_equiv_map, record the valid age for each entry.
  81      The entry is invalid if its age is less than const_age.  */
  82   unsigned int *const_age_map;
  83   /* Target of the inline function being expanded, or NULL if none.  */
  84   rtx inline_target;
  85   /* When an insn is being copied by copy_rtx_and_substitute,
  86      this is nonzero if we have copied an ASM_OPERANDS.
  87      In that case, it is the original input-operand vector.  */
  88   rtvec orig_asm_operands_vector;
  89   /* When an insn is being copied by copy_rtx_and_substitute,
  90      this is nonzero if we have copied an ASM_OPERANDS.
  91      In that case, it is the copied input-operand vector.  */
  92   rtvec copy_asm_operands_vector;
  93   /* Likewise, this is the copied constraints vector.  */
  94   rtvec copy_asm_constraints_vector;
  95
  96   /* Indications for regs being pointers and their alignment.  */
  97   char *regno_pointer_flag;
  98   char *regno_pointer_align;
  99
 100   /* The next few fields are used for subst_constants to record the SETs
 101      that it saw.  */
 102   int num_sets;
 103   struct equiv_table
 104     {
 105       rtx dest;
 106       rtx equiv;
 107     }  equiv_sets[MAX_RECOG_OPERANDS];
 108   /* Record the last thing assigned to pc.  This is used for folded
 109      conditional branch insns.  */
 110   rtx last_pc_value;
 111 #ifdef HAVE_cc0
 112   /* Record the last thing assigned to cc0.  */
 113   rtx last_cc0_value;
 114 #endif
 115 };
 116
 117 /* Return a copy of an rtx (as needed), substituting pseudo-register,
 118    labels, and frame-pointer offsets as necessary.  */
 119 extern rtx copy_rtx_and_substitute PROTO((rtx, struct inline_remap *));
 120
 121 extern void try_constants PROTO((rtx, struct inline_remap *));
 122
 123 extern void mark_stores PROTO((rtx, rtx));
 124
 125 /* Return the label indicated.  */
 126 extern rtx get_label_from_map PROTO((struct inline_remap *, int));
 127
 128 /* Set the label indicated.  */
 129 #define set_label_in_map(MAP, I, X) ((MAP)->label_map[I] = (X))
 130
 131 /* Unfortunately, we need a global copy of const_equiv map for communication
 132    with a function called from note_stores.  Be *very* careful that this
 133    is used properly in the presence of recursion.  */
 134
 135 extern rtx *global_const_equiv_map;
 136 extern int global_const_equiv_map_size;