1 /* Function integration definitions for GNU C-Compiler
2 Copyright (C) 1990 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* This structure is used to remap objects in the function being inlined to
21 those belonging to the calling function. It is passed by
22 expand_inline_function to its children.
24 This structure is also used when unrolling loops and otherwise
25 replicating code, although not all fields are needed in this case;
26 only those fields needed by copy_rtx_and_substitute() and its children
29 This structure is used instead of static variables because
30 expand_inline_function may be called recursively via expand_expr. */
34 /* True if we are doing function integration, false otherwise.
35 Used to control whether RTX_UNCHANGING bits are copied by
36 copy_rtx_and_substitute. */
38 /* Definition of function be inlined. */
39 union tree_node
*fndecl
;
40 /* Place to put insns needed at start of function. */
42 /* Mapping from old registers to new registers.
43 It is allocated and deallocated in `expand_inline_function' */
45 /* Mapping from old code-labels to new code-labels.
46 The first element of this map is label_map[min_labelno]. */
48 /* Mapping from old insn uid's to copied insns. The first element
49 of this map is insn_map[min_insnno]; the last element is
50 insn_map[max_insnno]. We keep the bounds here for when the map
51 only covers a partial range of insns (such as loop unrolling or
54 int min_insnno
, max_insnno
;
56 /* Map pseudo reg number in calling function to equivalent constant. We
57 cannot in general substitute constants into parameter pseudo registers,
58 since some machine descriptions (many RISCs) won't always handle
59 the resulting insns. So if an incoming parameter has a constant
60 equivalent, we record it here, and if the resulting insn is
61 recognizable, we go with it.
63 We also use this mechanism to convert references to incoming arguments
64 and stacked variables. copy_rtx_and_substitute will replace the virtual
65 incoming argument and virtual stacked variables registers with new
66 pseudos that contain pointers into the replacement area allocated for
67 this inline instance. These pseudos are then marked as being equivalent
68 to the appropriate address and substituted if valid. */
70 /* Number of entries in const_equiv_map and const_arg_map. */
71 int const_equiv_map_size
;
72 /* This is incremented for each new basic block.
73 It is used to store in const_age_map to record the domain of validity
74 of each entry in const_equiv_map.
75 A value of -1 indicates an entry for a reg which is a parm.
76 All other values are "positive". */
77 #define CONST_AGE_PARM (-1)
78 unsigned int const_age
;
79 /* In parallel with const_equiv_map, record the valid age for each entry.
80 The entry is invalid if its age is less than const_age. */
81 unsigned int *const_age_map
;
82 /* Target of the inline function being expanded, or NULL if none. */
84 /* When an insn is being copied by copy_rtx_and_substitute,
85 this is nonzero if we have copied an ASM_OPERANDS.
86 In that case, it is the original input-operand vector. */
87 rtvec orig_asm_operands_vector
;
88 /* When an insn is being copied by copy_rtx_and_substitute,
89 this is nonzero if we have copied an ASM_OPERANDS.
90 In that case, it is the copied input-operand vector. */
91 rtvec copy_asm_operands_vector
;
92 /* Likewise, this is the copied constraints vector. */
93 rtvec copy_asm_constraints_vector
;
95 /* The next few fields are used for subst_constants to record the SETs
102 } equiv_sets
[MAX_RECOG_OPERANDS
];
103 /* Record the last thing assigned to pc. This is used for folded
104 conditional branch insns. */
107 /* Record the last thing assigned to cc0. */
112 /* Return a copy of an rtx (as needed), substituting pseudo-register,
113 labels, and frame-pointer offsets as necessary. */
114 extern rtx copy_rtx_and_substitute
PROTO((rtx
, struct inline_remap
*));
116 extern void try_constants
PROTO((rtx
, struct inline_remap
*));
118 extern void mark_stores
PROTO((rtx
, rtx
));
120 extern rtx
*global_const_equiv_map
;