1 /* Function integration definitions for GNU C-Compiler
2 Copyright (C) 1990, 1995 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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. */
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.
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
30 This structure is used instead of static variables because
31 expand_inline_function may be called recursively via expand_expr. */
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. */
39 /* Definition of function be inlined. */
40 union tree_node
*fndecl
;
41 /* Place to put insns needed at start of function. */
43 /* Mapping from old registers to new registers.
44 It is allocated and deallocated in `expand_inline_function' */
46 /* Mapping from old code-labels to new code-labels.
47 The first element of this map is label_map[min_labelno]. */
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
55 int min_insnno
, max_insnno
;
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.
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. */
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. */
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
;
96 /* Indications for regs being pointers and their alignment. */
97 char *regno_pointer_flag
;
98 char *regno_pointer_align
;
100 /* The next few fields are used for subst_constants to record the SETs
107 } equiv_sets
[MAX_RECOG_OPERANDS
];
108 /* Record the last thing assigned to pc. This is used for folded
109 conditional branch insns. */
112 /* Record the last thing assigned to cc0. */
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
*));
121 extern void try_constants
PROTO((rtx
, struct inline_remap
*));
123 extern void mark_stores
PROTO((rtx
, rtx
));
125 /* Return the label indicated. */
126 extern rtx get_label_from_map
PROTO((struct inline_remap
*, int));
128 /* Set the label indicated. */
129 #define set_label_in_map(map, i, x) \
130 ((map)->label_map[i] = (x))
132 /* Unfortunately, we need a global copy of const_equiv map for communication
133 with a function called from note_stores. Be *very* careful that this
134 is used properly in the presence of recursion. */
136 extern rtx
*global_const_equiv_map
;
137 extern int global_const_equiv_map_size
;