1 /* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
8 * irmode -- Modes for ir operators
10 * @author Christian Schaefer, Matthias Heil
12 * This module specifies the modes that type the firm nodes. It defines
13 * a datasturcture that describes a mode and implements constructors and
14 * access routines to this datastructure. Further it defines a set of
18 * UKA tech report 1999-44 for more information about modes.
26 #ifndef _TARVAL_TYPEDEF_
27 #define _TARVAL_TYPEDEF_
28 typedef struct tarval tarval;
32 * Contains relevant information about a mode.
34 * Neccessary information about a mode is stored in this struct
35 * which is used by the tarval module to perform calculations
36 * and comparisons of values of a such described mode.
39 * - modecode code: An unambigous int (enum) for the mode
40 * - ident *name: Name of this mode. Two modes are different if the name is different.
41 * - mode_sort sort: sort of mode specifying possible usage kategories
42 * - int size: size of the mode in Bits.
43 * - int align: byte alignment
44 * - unsigned sign:1: signedness of this mode
48 * The tech report 1999-44 describing FIRM and predefined modes
51 typedef struct ir_mode ir_mode;
53 /* ********** Predefined modes ********** */
56 * Predefined mode according to tech report 1999-14.
58 typedef enum { /* irm is short for `ir mode' */
59 irm_BB, /**< basic block */
60 irm_X, /**< execution */
61 irm_F, /**< float(32) */
62 irm_D, /**< double(64) */
63 irm_E, /**< extended(80) */
64 irm_Bs, /**< signed byte(8) */
65 irm_Bu, /**< unsigned byte(8) */
66 irm_Hs, /**< signed short(16) */
67 irm_Hu, /**< unsigned short(16) */
68 irm_Is, /**< signed int(32) */
69 irm_Iu, /**< unsigned int(32) */
70 irm_Ls, /**< signed long(64) */
71 irm_Lu, /**< unsigned long(64) */
72 irm_C, /**< character */
73 irm_P, /**< pointer */
74 irm_b, /**< internal boolean */
77 irm_U, /**< unicode character */
78 irm_ANY, /**< undefined mode */
79 irm_BAD, /**< bad mode */
80 irm_max /**< maximum value for modecode */
83 /** These values represent the different mode classes of value representations.
86 /* Predefined sorts of modes */
87 irms_auxiliary, /**< Only for Firm use. Not extensible. (irm_T, irm_ANY, irm_BAD) */
88 /* irms_control_flow **< Marks all control flow modes. Not extensible. (irm_BB, irm_X) */
89 /* irms_memory **< Marks the memory mode. Not extensible. (irm_M) */
90 irms_internal_boolean, /**< Internal boolean representation.
91 Storing to memory impossible, convert first. (irm_b) */
92 /** user-extensible sorts of modes **/
93 irms_int_number, /**< A mode to represent int numbers.
94 Integer computations can be performed. */
95 irms_float_number, /**< A mode to represent float numbers.
96 Floating point computations can be performed. */
97 irms_reference, /**< A mode to represent entities.
98 Restricted int computations can be performed */
99 irms_character /**< A mode to represent characters/symbols
100 ?? Are computations allowed? as int?? */
103 /** These values represent the different arithmetic operations possible with a mode.
104 Further arithmetics can be defined, e.g., for @@@ modes.
107 irma_uninitialized = 0,
108 irma_none = 1, /**< For modes for which no representation is specified.
109 These are modes of sort auxiliary, internal_boolean and
111 irma_twos_complement = 2, /**< Values of the mode are represented as two's complement.
112 Only legal for modes of sort int_number and reference. */
113 irma_ones_complement, /**< Values of the mode are represented as one's complement.
114 Only legal for modes of sort int_number and reference. */
115 irma_int_BCD, /**< Values of the mode are represented as binary coded decimals.
116 Only legal for modes of sort int_number and reference. */
117 irma_ieee754 = 256, /**< Values of the mode are represented according to ieee754
118 floatingpoint standard. Only legal for modes of sort float_number. */
119 irma_float_BCD, /**< Values of the mode are represented as binary coded decimals
120 according to @@@ which standars??? Only legal for modes of
121 sort float_number. */
126 /* ********** Constructor for user defined modes **************** */
128 * Creates a new mode.
130 * @param name the name of the mode to be created
131 * @param sort the mode_sort of the mode to be created
132 * @param bit_size number of bits this mode allocate
133 * @param align the byte alignment for an entity of this mode (in bits)
134 * @param sign non-zero if this is a signed mode
136 * This function constructs a new mode given by the parameters.
137 * If the parameters match an already defined mode, this mode is returned
138 * (including the default modes).
139 * If the mode is newly allocated, a new unique mode_code is choosen.
140 * Also, special value tarvals will be calculated such as null,
141 * min, max and can be retrieved using the get_mode_* fuctions
144 * The new mode or NULL on error.
147 * It is allowed to construct the default modes. So, a call
148 * new_ir_mode("Is", irms_int_number, 32, 4, 1) will return mode_Is.
150 ir_mode *new_ir_mode(const char *name, mode_sort sort, int bit_size, int align, int sign);
152 /* ********** Access methods to read mode information *********** */
154 /** Returns the classification of the mode */
155 modecode get_mode_modecode(const ir_mode *mode);
157 /** Returns the ident* of the mode */
158 ident *get_mode_ident(const ir_mode *mode);
160 /** Returns the null-terminated name of this mode. */
161 const char *get_mode_name(const ir_mode *mode);
163 /** Returns a coarse classification of the mode. */
164 mode_sort get_mode_sort(const ir_mode *mode);
166 /** Returns the size of values of the mode in bits. */
167 int get_mode_size_bits(const ir_mode *mode);
169 /** Returns the size of values of the mode in bytes. If the size is not
170 dividable by 8 returns -1. */
171 int get_mode_size_bytes(const ir_mode *mode);
173 /** Returns the alignment of values of the mode in bytes. */
174 int get_mode_align(const ir_mode *mode);
176 /** Returns the signess of a mode */
177 int get_mode_sign (const ir_mode *mode);
180 * Returns the smallest representable value of a given mode.
182 * For modes of the sort float_number this is the most negative value
183 * bigger than -infinit.
185 tarval *get_mode_min(ir_mode *mode);
188 * Returns the biggest representable value o f a given mode.
190 * For modes of the sort float_number this is the largest value lower
193 tarval *get_mode_max(ir_mode *mode);
196 * Returns the value Zero represented in this mode.
198 * Zero is the additive neutral element and as such
199 * is defined only for modes allowing addition, i.e.
200 * floats and ints, and references (NULL-Pointer)
201 * else returns tarval_bad.
203 tarval *get_mode_null(ir_mode *mode);
206 * Returns the value One, represented in this mode.
208 * One, being the multiplicative neutral element,
209 * is defined only for modes allowing multiplication,
210 * i.e. ints and floats.
212 tarval *get_mode_one(ir_mode *mode);
215 * Returns the positive infinite value of a mode.
217 * This is only valid for float_numbers, other modes
218 * will result in tarval_bad.
220 tarval *get_mode_infinite(ir_mode *mode);
223 * Returns the NAN value of a given mode.
225 * This is only valid for float_numbers, other modes
226 * will result in tarval_bad.
228 tarval *get_mode_NAN(ir_mode *mode);
230 /* -- Auxiliary modes necessary for the Firm representation -- */
231 extern ir_mode *mode_T; /**< tuple (none) */
232 extern ir_mode *mode_X; /**< execution */
233 extern ir_mode *mode_M; /**< memory */
234 extern ir_mode *mode_BB; /**< block */
236 /* -- A set of predifined, numerical modes according to Techreport 1999-44 -- */
237 extern ir_mode *mode_F; /**< signed float(32) */
238 extern ir_mode *mode_D; /**< signed double(64) */
239 extern ir_mode *mode_E; /**< signed extended(80) */
240 extern ir_mode *mode_Bs; /**< signed byte (former char) */
241 extern ir_mode *mode_Bu; /**< unsigned byte (former char) */
242 extern ir_mode *mode_Hs; /**< signed short integer */
243 extern ir_mode *mode_Hu; /**< unsigened short integer */
244 extern ir_mode *mode_Is; /**< signed integer */
245 extern ir_mode *mode_Iu; /**< unsigned integer */
246 extern ir_mode *mode_Ls; /**< signed long integer */
247 extern ir_mode *mode_Lu; /**< unsigned long integer */
249 extern ir_mode *mode_b; /**< internal boolean */
250 extern ir_mode *mode_C; /**< 8 bit char */
251 extern ir_mode *mode_U; /**< 16 bit unicode char */
252 extern ir_mode *mode_P; /**< pointer */
254 extern ir_mode *mode_ANY;/**< undefined mode */
255 extern ir_mode *mode_BAD;/**< bad mode */
258 /** Access routines for JNI Interface */
259 ir_mode *get_modeT(void);
260 ir_mode *get_modeF(void);
261 ir_mode *get_modeD(void);
262 ir_mode *get_modeE(void);
263 ir_mode *get_modeBs(void);
264 ir_mode *get_modeBu(void);
265 ir_mode *get_modeHs(void);
266 ir_mode *get_modeHu(void);
267 ir_mode *get_modeIs(void);
268 ir_mode *get_modeIu(void);
269 ir_mode *get_modeLs(void);
270 ir_mode *get_modeLu(void);
271 ir_mode *get_modeC(void);
272 ir_mode *get_modeU(void);
273 ir_mode *get_modeP(void);
274 ir_mode *get_modeb(void);
275 ir_mode *get_modeX(void);
276 ir_mode *get_modeM(void);
277 ir_mode *get_modeBB(void);
278 ir_mode *get_modeANY(void);
279 ir_mode *get_modeBAD(void);
282 Functions to check, whether a modecode is signed, float, int, num, data,
285 For more exact definitions read the corresponding pages
286 in the firm documentation or the following enumeration
288 The set of "float" is defined as:
289 float = {irm_F, irm_D, irm_E}
291 The set of "int" is defined as:
292 int = {irm_Bs, irm_Bu, irm_Hs, irm_Hu, irm_Is, irm_Iu, irm_Ls, irm_Lu}
294 The set of "num" is defined as:
295 num = {irm_F, irm_D, irm_E, irm_Bs, irm_Bu, irm_Hs, irm_Hu,
296 irm_Is, irm_Iu, irm_Ls, irm_Lu}
299 The set of "data" is defined as:
300 data = {irm_F, irm_D, irm_E irm_Bs, irm_Bu, irm_Hs, irm_Hu,
301 irm_Is, irm_Iu, irm_Ls, irm_Lu, irm_C, irm_U, irm_P}
302 = {num || irm_C || irm_P}
304 The set of "datab" is defined as:
305 datab = {irm_F, irm_D, irm_E, irm_Bs, irm_Bu, irm_Hs, irm_Hu,
306 irm_Is, irm_Iu, irm_Ls, irm_Lu, irm_C, irm_U, irm_P, irm_b}
309 The set of "dataM" is defined as:
310 dataM = {irm_F, irm_D, irm_E, irm_Bs, irm_Bu, irm_Hs, irm_Hu,
311 irm_Is, irm_Iu, irm_Ls, irm_Lu, irm_C, irm_U, irm_P, irm_M}
315 /* Test for a certain class of modes. */
316 int mode_is_signed (const ir_mode *mode);
317 int mode_is_float (const ir_mode *mode);
318 int mode_is_int (const ir_mode *mode);
319 int mode_is_character (const ir_mode *mode);
320 int mode_is_reference (const ir_mode *mode);
321 int mode_is_num (const ir_mode *mode);
322 int mode_is_data (const ir_mode *mode);
323 int mode_is_datab (const ir_mode *mode);
324 int mode_is_dataM (const ir_mode *mode);
326 /** Returns true if sm can be converted to lm without loss
327 according to firm definiton */
328 int smaller_mode(const ir_mode *sm, const ir_mode *lm);
330 /** mode module initialization, call once before use of any other function **/
331 void init_mode (void);
333 #endif /* _IRMODE_H_ */