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e0001a05 | 1 | /* Table of relaxations for Xtensa assembly. |
43cd72b9 | 2 | Copyright 2003, 2004 Free Software Foundation, Inc. |
e0001a05 NC |
3 | |
4 | This file is part of GAS, the GNU Assembler. | |
5 | ||
6 | GAS 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 | GAS 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 GAS; see the file COPYING. If not, write to | |
c138bc38 | 18 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, |
4b4da160 | 19 | MA 02110-1301, USA. */ |
e0001a05 NC |
20 | |
21 | #ifndef XTENSA_RELAX_H | |
22 | #define XTENSA_RELAX_H | |
23 | ||
24 | #include "xtensa-isa.h" | |
25 | ||
26 | ||
27 | /* Data structures for the table-driven relaxations for Xtensa processors. | |
28 | See xtensa-relax.c for details. */ | |
29 | ||
30 | typedef struct transition_list TransitionList; | |
31 | typedef struct transition_table TransitionTable; | |
32 | typedef struct transition_rule TransitionRule; | |
33 | typedef struct precondition_list PreconditionList; | |
34 | typedef struct precondition Precondition; | |
35 | ||
43cd72b9 BW |
36 | typedef struct req_or_option_list ReqOrOptionList; |
37 | typedef struct req_or_option_list ReqOrOption; | |
38 | typedef struct req_option_list ReqOptionList; | |
39 | typedef struct req_option_list ReqOption; | |
40 | ||
e0001a05 NC |
41 | struct transition_table |
42 | { | |
43 | int num_opcodes; | |
44 | TransitionList **table; /* Possible transitions for each opcode. */ | |
45 | }; | |
46 | ||
47 | struct transition_list | |
48 | { | |
49 | TransitionRule *rule; | |
50 | TransitionList *next; | |
51 | }; | |
52 | ||
53 | struct precondition_list | |
54 | { | |
55 | Precondition *precond; | |
56 | PreconditionList *next; | |
57 | }; | |
58 | ||
59 | ||
43cd72b9 BW |
60 | /* The required options for a rule are represented with a two-level |
61 | structure, with leaf expressions combined by logical ORs at the | |
62 | lower level, and the results then combined by logical ANDs at the | |
63 | top level. The AND terms are linked in a list, and each one can | |
64 | contain a reference to a list of OR terms. The leaf expressions, | |
65 | i.e., the OR options, can be negated by setting the is_true field | |
66 | to FALSE. There are two classes of leaf expressions: (1) those | |
67 | that are properties of the Xtensa configuration and can be | |
68 | evaluated once when building the tables, and (2) those that depend | |
69 | of the state of directives or other settings that may vary during | |
70 | the assembly. The following expressions may be used in group (1): | |
71 | ||
72 | IsaUse*: Xtensa configuration settings. | |
73 | realnop: TRUE if the instruction set includes a NOP instruction. | |
74 | ||
75 | There are currently no expressions in group (2), but they are still | |
76 | supported since there is a good chance they'll be needed again for | |
77 | something. */ | |
78 | ||
79 | struct req_option_list | |
80 | { | |
81 | ReqOrOptionList *or_option_terms; | |
82 | ReqOptionList *next; | |
83 | }; | |
84 | ||
85 | struct req_or_option_list | |
86 | { | |
87 | char *option_name; | |
88 | bfd_boolean is_true; | |
89 | ReqOrOptionList *next; | |
90 | }; | |
91 | ||
e0001a05 NC |
92 | /* Operand types and constraints on operands: */ |
93 | ||
94 | typedef enum op_type OpType; | |
95 | typedef enum cmp_op CmpOp; | |
96 | ||
97 | enum op_type | |
98 | { | |
99 | OP_CONSTANT, | |
100 | OP_OPERAND, | |
101 | OP_OPERAND_LOW8, /* Sign-extended low 8 bits of immed. */ | |
43cd72b9 | 102 | OP_OPERAND_HI24S, /* High 24 bits of immed, |
e0001a05 NC |
103 | plus 0x100 if low 8 bits are signed. */ |
104 | OP_OPERAND_F32MINUS, /* 32 - immed. */ | |
43cd72b9 BW |
105 | OP_OPERAND_LOW16U, /* Low 16 bits of immed. */ |
106 | OP_OPERAND_HI16U, /* High 16 bits of immed. */ | |
e0001a05 NC |
107 | OP_LITERAL, |
108 | OP_LABEL | |
109 | }; | |
110 | ||
111 | enum cmp_op | |
112 | { | |
113 | OP_EQUAL, | |
114 | OP_NOTEQUAL, | |
115 | }; | |
116 | ||
117 | struct precondition | |
118 | { | |
119 | CmpOp cmp; | |
120 | int op_num; | |
121 | OpType typ; /* CONSTANT: op_data is a constant. | |
122 | OPERAND: operand op_num must equal op_data. | |
123 | Cannot be LITERAL or LABEL. */ | |
124 | int op_data; | |
125 | }; | |
126 | ||
43cd72b9 | 127 | |
e0001a05 NC |
128 | typedef struct build_op BuildOp; |
129 | ||
130 | struct build_op | |
131 | { | |
132 | int op_num; | |
133 | OpType typ; | |
134 | unsigned op_data; /* CONSTANT: op_data is the value to encode. | |
135 | OPERAND: op_data is the field in the | |
136 | source instruction to take the value from | |
137 | and encode in the op_num field here. | |
138 | LITERAL or LABEL: op_data is the ordinal | |
139 | that identifies the appropriate one, i.e., | |
140 | there can be more than one literal or | |
141 | label in an expansion. */ | |
142 | BuildOp *next; | |
143 | }; | |
144 | ||
145 | typedef struct build_instr BuildInstr; | |
146 | typedef enum instr_type InstrType; | |
147 | ||
148 | enum instr_type | |
149 | { | |
150 | INSTR_INSTR, | |
151 | INSTR_LITERAL_DEF, | |
152 | INSTR_LABEL_DEF | |
153 | }; | |
154 | ||
155 | struct build_instr | |
156 | { | |
157 | InstrType typ; | |
158 | unsigned id; /* LITERAL_DEF or LABEL_DEF: an ordinal to | |
159 | identify which one. */ | |
43cd72b9 | 160 | xtensa_opcode opcode; /* Unused for LITERAL_DEF or LABEL_DEF. */ |
e0001a05 NC |
161 | BuildOp *ops; |
162 | BuildInstr *next; | |
163 | }; | |
164 | ||
165 | struct transition_rule | |
166 | { | |
167 | xtensa_opcode opcode; | |
168 | PreconditionList *conditions; | |
43cd72b9 | 169 | ReqOptionList *options; |
e0001a05 NC |
170 | BuildInstr *to_instr; |
171 | }; | |
172 | ||
43cd72b9 BW |
173 | typedef int (*transition_cmp_fn) (const TransitionRule *, |
174 | const TransitionRule *); | |
175 | ||
7fa3d080 BW |
176 | extern TransitionTable *xg_build_simplify_table (transition_cmp_fn); |
177 | extern TransitionTable *xg_build_widen_table (transition_cmp_fn); | |
e0001a05 | 178 | |
7fa3d080 BW |
179 | extern bfd_boolean xg_has_userdef_op_fn (OpType); |
180 | extern long xg_apply_userdef_op_fn (OpType, long); | |
e0001a05 NC |
181 | |
182 | #endif /* !XTENSA_RELAX_H */ |