gcc/integrate.h

   1 /* Function integration definitions for GNU C-Compiler
   2    Copyright (C) 1990, 1995, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.  */
  20
  21 #include "varray.h"
  22
  23 /* This structure is used to remap objects in the function being inlined to
  24    those belonging to the calling function.  It is passed by
  25    expand_inline_function to its children.
  26
  27    This structure is also used when unrolling loops and otherwise
  28    replicating code, although not all fields are needed in this case;
  29    only those fields needed by copy_rtx_and_substitute() and its children
  30    are used.
  31
  32    This structure is used instead of static variables because
  33    expand_inline_function may be called recursively via expand_expr.  */
  34
  35 struct inline_remap
  36 {
  37   /* True if we are doing function integration, false otherwise.
  38      Used to control whether RTX_UNCHANGING bits are copied by
  39      copy_rtx_and_substitute.  */
  40   int integrating;
  41   /* Definition of function be inlined.  */
  42   union tree_node *fndecl;
  43   /* Place to put insns needed at start of function.  */
  44   rtx insns_at_start;
  45   /* Mapping from old BLOCKs to new BLOCKs.  */
  46   varray_type block_map;
  47   /* Mapping from old registers to new registers.
  48      It is allocated and deallocated in `expand_inline_function' */
  49   rtx *reg_map;
  50 #if defined (LEAF_REGISTERS) && defined (LEAF_REG_REMAP)
  51   /* Mapping from old leaf registers to new leaf registers.  */
  52   rtx leaf_reg_map[FIRST_PSEUDO_REGISTER][NUM_MACHINE_MODES];
  53 #endif
  54   /* Mapping from old code-labels to new code-labels.
  55      The first element of this map is label_map[min_labelno].  */
  56   rtx *label_map;
  57   /* Mapping from old insn uid's to copied insns.  The first element
  58    of this map is insn_map[min_insnno]; the last element is
  59    insn_map[max_insnno].  We keep the bounds here for when the map
  60    only covers a partial range of insns (such as loop unrolling or
  61    code replication).  */
  62   rtx *insn_map;
  63   int min_insnno, max_insnno;
  64
  65   /* Map pseudo reg number in calling function to equivalent constant.  We
  66      cannot in general substitute constants into parameter pseudo registers,
  67      since some machine descriptions (many RISCs) won't always handle
  68      the resulting insns.  So if an incoming parameter has a constant
  69      equivalent, we record it here, and if the resulting insn is
  70      recognizable, we go with it.
  71
  72      We also use this mechanism to convert references to incoming arguments
  73      and stacked variables.  copy_rtx_and_substitute will replace the virtual
  74      incoming argument and virtual stacked variables registers with new
  75      pseudos that contain pointers into the replacement area allocated for
  76      this inline instance.  These pseudos are then marked as being equivalent
  77      to the appropriate address and substituted if valid.  */
  78   varray_type const_equiv_varray;
  79   /* This is incremented for each new basic block.
  80      It is used to store in the age field to record the domain of validity
  81      of each entry in const_equiv_varray.
  82      A value of -1 indicates an entry for a reg which is a parm.
  83      All other values are "positive".  */
  84 #define CONST_AGE_PARM (-1)
  85   unsigned int const_age;
  86
  87   /* Target of the inline function being expanded, or NULL if none.  */
  88   rtx inline_target;
  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 original input-operand vector.  */
  92   rtvec orig_asm_operands_vector;
  93   /* When an insn is being copied by copy_rtx_and_substitute,
  94      this is nonzero if we have copied an ASM_OPERANDS.
  95      In that case, it is the copied input-operand vector.  */
  96   rtvec copy_asm_operands_vector;
  97   /* Likewise, this is the copied constraints vector.  */
  98   rtvec copy_asm_constraints_vector;
  99
 100   /* Target of a return insn, if needed and inlining.  */
 101   rtx local_return_label;
 102
 103   /* Indications for regs being pointers and their alignment.  */
 104   unsigned char *regno_pointer_align;
 105   rtx *x_regno_reg_rtx;
 106
 107   /* The next few fields are used for subst_constants to record the SETs
 108      that it saw.  */
 109   int num_sets;
 110   struct equiv_table
 111     {
 112       rtx dest;
 113       rtx equiv;
 114     }  equiv_sets[MAX_RECOG_OPERANDS];
 115   /* Record the last thing assigned to pc.  This is used for folded
 116      conditional branch insns.  */
 117   rtx last_pc_value;
 118 #ifdef HAVE_cc0
 119   /* Record the last thing assigned to cc0.  */
 120   rtx last_cc0_value;
 121 #endif
 122   /* Note mode of COMPARE if the mode would be otherwise lost (comparing of
 123      two VOIDmode constants.  */
 124   rtx compare_src;
 125   enum machine_mode compare_mode;
 126 };
 127
 128 /* Return a copy of an rtx (as needed), substituting pseudo-register,
 129    labels, and frame-pointer offsets as necessary.  */
 130 extern rtx copy_rtx_and_substitute PARAMS ((rtx, struct inline_remap *, int));
 131
 132 /* Return a pseudo that corresponds to the value in the specified hard
 133    reg as of the start of the function (for inlined functions, the
 134    value at the start of the parent function).  */
 135 extern rtx get_hard_reg_initial_val             PARAMS ((enum machine_mode, int));
 136 /* Likewise, but for a different than the current function, or
 137    arbitrary expression.  */
 138 extern rtx get_func_hard_reg_initial_val        PARAMS ((struct function *, rtx));
 139 /* Likewise, but iff someone else has caused it to become allocated.  */
 140 extern rtx has_func_hard_reg_initial_val        PARAMS ((struct function *, rtx));
 141 /* Likewise, but for common cases.  */
 142 extern rtx has_hard_reg_initial_val             PARAMS ((enum machine_mode, int));
 143 /* If a pseudo represents an initial hard reg (or expression), return
 144    it, else return NULL_RTX.  */
 145 extern rtx get_hard_reg_initial_reg             PARAMS ((struct function *, rtx));
 146 /* Called from rest_of_compilation.  */
 147 extern void emit_initial_value_sets             PARAMS ((void));
 148 extern void allocate_initial_values             PARAMS ((rtx *));
 149
 150 /* Copy a declaration when one function is substituted inline into
 151    another.  */
 152 extern union tree_node *copy_decl_for_inlining PARAMS ((union tree_node *,
 153                                                       union tree_node *,
 154                                                       union tree_node *));
 155
 156 /* Check whether there's any attribute in a function declaration that
 157    makes the function uninlinable.  Returns false if it finds any,
 158    true otherwise.  */
 159 extern bool function_attribute_inlinable_p PARAMS ((union tree_node *));
 160
 161 extern void try_constants PARAMS ((rtx, struct inline_remap *));
 162
 163 /* Return the label indicated.  */
 164 extern rtx get_label_from_map PARAMS ((struct inline_remap *, int));
 165
 166 /* Set the label indicated.  */
 167 #define set_label_in_map(MAP, I, X) ((MAP)->label_map[I] = (X))
 168
 169 /* Unfortunately, we need a global copy of const_equiv varray for
 170    communication with a function called from note_stores.  Be *very*
 171    careful that this is used properly in the presence of recursion.  */
 172
 173 extern varray_type global_const_equiv_varray;
 174
 175 #define MAYBE_EXTEND_CONST_EQUIV_VARRAY(MAP,MAX)                        \
 176   {                                                                     \
 177     if ((size_t)(MAX) >= VARRAY_SIZE ((MAP)->const_equiv_varray))       \
 178       {                                                                 \
 179         int is_global = (global_const_equiv_varray                      \
 180                          == (MAP)->const_equiv_varray);                 \
 181         VARRAY_GROW ((MAP)->const_equiv_varray, (MAX)+1);               \
 182         if (is_global)                                                  \
 183            global_const_equiv_varray = (MAP)->const_equiv_varray;       \
 184       }                                                                 \
 185   }
 186
 187 #define SET_CONST_EQUIV_DATA(MAP,REG,RTX,AGE)                           \
 188   {                                                                     \
 189     struct const_equiv_data *p;                                         \
 190     MAYBE_EXTEND_CONST_EQUIV_VARRAY ((MAP), REGNO (REG));               \
 191     p = &VARRAY_CONST_EQUIV ((MAP)->const_equiv_varray, REGNO (REG));   \
 192     p->rtx = (RTX);                                                     \
 193     p->age = (AGE);                                                     \
 194   }