2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Data modes of operations.
23 * @author Martin Trapp, Christian Schaefer, Goetz Lindenmaier, Mathias Heil,
27 * This module specifies the modes that type the firm nodes. It defines
28 * a datasturcture that describes a mode and implements constructors and
29 * access routines to this datastructure. Further it defines a set of
33 * UKA tech report 1999-44 for more information about modes.
35 #ifndef FIRM_IR_IRMODE_H
36 #define FIRM_IR_IRMODE_H
38 #include "firm_types.h"
41 /* ********** Predefined modes ********** */
44 * Predefined mode according to tech report 1999-14.
46 typedef enum ir_modecode { /* irm is short for `ir mode' */
47 irm_BB, /**< basic block */
48 irm_X, /**< execution */
49 irm_F, /**< float(32) */
50 irm_D, /**< double(64) */
51 irm_E, /**< extended(80) */
52 irm_Bs, /**< signed byte(8) */
53 irm_Bu, /**< unsigned byte(8) */
54 irm_Hs, /**< signed short(16) */
55 irm_Hu, /**< unsigned short(16) */
56 irm_Is, /**< signed int(32) */
57 irm_Iu, /**< unsigned int(32) */
58 irm_Ls, /**< signed long(64) */
59 irm_Lu, /**< unsigned long(64) */
60 irm_LLs, /**< signed long long(128) */
61 irm_LLu, /**< unsigned long long(128) */
62 irm_P, /**< pointer */
63 irm_b, /**< internal boolean */
66 irm_ANY, /**< undefined mode */
67 irm_BAD, /**< bad mode */
68 irm_max /**< maximum value for ir_modecode */
71 /** These values represent the different mode classes of value representations.
73 typedef enum ir_mode_sort {
74 /* Predefined sorts of modes */
75 irms_auxiliary, /**< Only for Firm use. Not extensible. (irm_T) */
76 irms_control_flow, /**< Marks all control flow modes. Not extensible. (irm_BB, irm_X) */
77 irms_memory, /**< Marks the memory mode. Not extensible. (irm_M) */
78 irms_internal_boolean, /**< Internal boolean representation.
79 Storing to memory impossible, convert first. (irm_b) */
80 /* user-extensible sorts of modes */
81 irms_int_number, /**< A mode to represent int numbers.
82 Integer computations can be performed. */
83 irms_float_number, /**< A mode to represent float numbers.
84 Floating point computations can be performed. */
85 irms_reference /**< A mode to represent entities.
86 Restricted int computations can be performed */
89 /** These values represent the different arithmetic operations possible with a mode.
90 Further arithmetics can be defined, e.g., for @@@ modes.
92 typedef enum ir_mode_arithmetic {
93 irma_uninitialized = 0,
94 irma_none = 1, /**< For modes for which no representation is specified.
95 These are modes of sort auxiliary, internal_boolean and character. */
96 irma_twos_complement = 2, /**< Values of the mode are represented as two's complement.
97 Only legal for modes of sort int_number and reference. */
98 irma_ones_complement, /**< Values of the mode are represented as one's complement.
99 Only legal for modes of sort int_number and reference. */
100 irma_int_BCD, /**< Values of the mode are represented as binary coded decimals.
101 Only legal for modes of sort int_number and reference. */
102 irma_ieee754 = 256, /**< Values of the mode are represented according to ieee754
103 floating point standard. Only legal for modes of sort float_number. */
104 irma_float_BCD, /**< Values of the mode are represented as binary coded decimals
105 according to @@@ which standards??? Only legal for modes of
106 sort float_number. */
108 } ir_mode_arithmetic;
111 /* ********** Constructor for user defined modes **************** */
113 * Creates a new mode.
115 * @param name the name of the mode to be created
116 * @param sort the ir_mode_sort of the mode to be created
117 * @param bit_size number of bits this mode allocate
118 * @param sign non-zero if this is a signed mode
119 * @param arithmetic arithmetic operations possible with a mode
120 * @param modulo_shift Is ignored for modes other than integer.
122 * This function constructs a new mode given by the parameters.
123 * If the parameters match an already defined mode, this mode is returned
124 * (including the default modes).
125 * If the mode is newly allocated, a new unique mode_code is chosen.
126 * Also, special value tarvals will be calculated such as null,
127 * min, max and can be retrieved using the get_mode_* functions
130 * The new mode or NULL on error.
133 * It is allowed to construct the default modes. So, a call
134 * new_ir_mode("Is", irms_int_number, 32, 1, irma_twos_complement, 32) will return mode_Is.
136 ir_mode *new_ir_mode(const char *name, ir_mode_sort sort, int bit_size, int sign,
137 ir_mode_arithmetic arithmetic, unsigned int modulo_shift);
140 * Creates a new vector mode.
142 * @param name the name of the mode to be created
143 * @param sort the ir_mode_sort of the mode to be created
144 * @param bit_size number of bits for one element of this mode
145 * @param num_of_elem number of elements in this vector mode
146 * @param sign non-zero if this is a signed mode
147 * @param arithmetic arithmetic operations possible with a mode
148 * @param modulo_shift Is ignored for modes other than integer.
150 * This function constructs a new vector mode given by the parameters.
151 * If the parameters match an already defined mode, this mode is returned.
152 * If the mode is newly allocated, a new unique mode_code is chosen.
153 * Also, special value tarvals will be calculated such as null,
154 * min, max and can be retrieved using the get_mode_* functions
157 * The new mode or NULL on error.
159 ir_mode *new_ir_vector_mode(const char *name, ir_mode_sort sort, int bit_size, unsigned num_of_elem, int sign,
160 ir_mode_arithmetic arithmetic, unsigned int modulo_shift);
163 * Checks whether a pointer points to a mode.
165 * @param thing an arbitrary pointer
168 * true if the thing is a mode, else false
170 int is_mode(void *thing);
172 /* ********** Access methods to read mode information *********** */
174 /** Returns the classification of the mode */
175 ir_modecode get_mode_modecode(const ir_mode *mode);
177 /** Returns the ident* of the mode */
178 ident *get_mode_ident(const ir_mode *mode);
180 /** Returns the null-terminated name of this mode. */
181 const char *get_mode_name(const ir_mode *mode);
183 /** Returns a coarse classification of the mode. */
184 ir_mode_sort get_mode_sort(const ir_mode *mode);
186 /** Returns the size of values of the mode in bits. */
187 unsigned get_mode_size_bits(const ir_mode *mode);
189 /** Returns the size of values of the mode in bytes.
190 * If the size is not dividable by 8 returns -1. */
191 unsigned get_mode_size_bytes(const ir_mode *mode);
193 /** Returns the signess of a mode.
195 * Returns the signess of a mode: 1 if mode is signed. */
196 int get_mode_sign(const ir_mode *mode);
198 /** Returns the arithmetic of a mode */
199 ir_mode_arithmetic get_mode_arithmetic(const ir_mode *mode);
201 /** Get the modulo shift attribute.
203 * Attribute modulo shift specifies for modes of kind irms_int_number
204 * whether shift applies modulo to value of bits to shift. Zero for
205 * modes that are not integer.
207 unsigned int get_mode_modulo_shift(const ir_mode *mode);
209 /** Return the number of vector elements.
211 * Attribute vector_elem specifies the number of vector elements of
212 * a vector mode. For non-vector modes it returns 1 for data and 0
213 * for all other modes
215 unsigned int get_mode_n_vector_elems(const ir_mode *mode);
217 /** Returns the stored intermediate information. */
218 void *get_mode_link(const ir_mode *mode);
220 /** Stores new intermediate information. */
221 void set_mode_link(ir_mode *mode, void *l);
224 * Returns the smallest representable value of a given mode.
226 * For modes of the sort float_number this is the most negative value
227 * bigger than -infinite.
229 tarval *get_mode_min(ir_mode *mode);
232 * Returns the biggest representable value o f a given mode.
234 * For modes of the sort float_number this is the largest value lower
237 tarval *get_mode_max(ir_mode *mode);
240 * Returns the value Zero represented in this mode.
242 * Zero is the additive neutral element and as such
243 * is defined only for modes allowing addition, i.e.
244 * op_pin_state_floats and ints, and references (NULL-Pointer)
245 * else returns tarval_bad.
247 tarval *get_mode_null(ir_mode *mode);
250 * Returns the value One, represented in this mode.
252 * One, being the multiplicative neutral element,
253 * is defined only for modes allowing multiplication,
254 * i.e. ints and floats.
256 tarval *get_mode_one(ir_mode *mode);
259 * Returns the value Minus One, represented in this mode.
261 * Minus One is defined only for modes allowing
262 * multiplication with signed values, i.e. signed ints and floats.
264 tarval *get_mode_minus_one(ir_mode *mode);
267 * Returns the value where all bits are One, represented in this mode.
269 * All One is defined only for modes integer, reference and boolean modes
271 tarval *get_mode_all_one(ir_mode *mode);
274 * Returns the positive infinite value of a mode.
276 * This is only valid for float_numbers, other modes
277 * will result in tarval_bad.
279 tarval *get_mode_infinite(ir_mode *mode);
282 * Returns the NAN value of a given mode.
284 * This is only valid for float_numbers, other modes
285 * will result in tarval_bad.
287 tarval *get_mode_NAN(ir_mode *mode);
289 extern ir_mode *mode_M; /**< memory */
291 /* -- A set of predefined, numerical modes according to Techreport 1999-44 -- */
292 extern ir_mode *mode_F; /**< signed float(32) */
293 extern ir_mode *mode_D; /**< signed double(64) */
294 extern ir_mode *mode_E; /**< signed extended(80) */
295 extern ir_mode *mode_Bs; /**< signed byte (former char) */
296 extern ir_mode *mode_Bu; /**< unsigned byte (former char) */
297 extern ir_mode *mode_Hs; /**< signed short integer */
298 extern ir_mode *mode_Hu; /**< unsigned short integer */
299 extern ir_mode *mode_Is; /**< signed integer */
300 extern ir_mode *mode_Iu; /**< unsigned integer */
301 extern ir_mode *mode_Ls; /**< signed long integer */
302 extern ir_mode *mode_Lu; /**< unsigned long integer */
303 extern ir_mode *mode_LLs; /**< signed long long integer */
304 extern ir_mode *mode_LLu; /**< unsigned long long integer */
306 extern ir_mode *mode_P; /**< pointer */
307 extern ir_mode *mode_P_code; /**< A pointer mode that is set by the client of libfirm. This mode
308 represents the pointer size of the target machine code addresses. Is initialized
310 extern ir_mode *mode_P_data; /**< A pointer mode that is set by the client of libfirm. This mode
311 represents the pointer size of the target machine data addresses. Is initialized
314 /* -- Auxiliary modes necessary for the Firm representation -- */
315 extern ir_mode *mode_b; /**< internal boolean */
317 extern ir_mode *mode_X; /**< execution */
318 extern ir_mode *mode_BB; /**< block */
320 extern ir_mode *mode_T; /**< tuple (none) */
321 extern ir_mode *mode_ANY;/**< undefined mode */
322 extern ir_mode *mode_BAD;/**< bad mode */
325 /** Access routines for JNI Interface */
326 ir_mode *get_modeF(void);
327 ir_mode *get_modeD(void);
328 ir_mode *get_modeE(void);
329 ir_mode *get_modeBs(void);
330 ir_mode *get_modeBu(void);
331 ir_mode *get_modeHs(void);
332 ir_mode *get_modeHu(void);
333 ir_mode *get_modeIs(void);
334 ir_mode *get_modeIu(void);
335 ir_mode *get_modeLs(void);
336 ir_mode *get_modeLu(void);
337 ir_mode *get_modeLLs(void);
338 ir_mode *get_modeLLu(void);
339 ir_mode *get_modeP(void);
340 ir_mode *get_modeb(void);
341 ir_mode *get_modeX(void);
342 ir_mode *get_modeBB(void);
343 ir_mode *get_modeM(void);
344 ir_mode *get_modeT(void);
345 ir_mode *get_modeANY(void);
346 ir_mode *get_modeBAD(void);
348 /** Returns the machine specific pointer mode for code addresses. */
349 ir_mode *get_modeP_code(void);
351 /** Returns the machine specific pointer mode for data addresses. */
352 ir_mode *get_modeP_data(void);
355 * Sets the machine specific pointer mode for code addresses.
356 * If not set, the predefined mode mode_P will be used.
358 void set_modeP_code(ir_mode *p);
361 * Sets the machine specific pointer mode for data addresses.
362 * If not set, the predefined mode mode_P will be used.
364 void set_modeP_data(ir_mode *p);
368 Functions to check, whether a ir_modecode is signed, float, int, character,
369 reference, num, data, datab or dataM.
371 For more exact definitions read the corresponding pages
372 in the firm documentation or the following enumeration
374 The set of "float" is defined as:
375 float = {irm_F, irm_D, irm_E}
377 The set of "int" is defined as:
378 int = {irm_Bs, irm_Bu, irm_Hs, irm_Hu, irm_Is, irm_Iu, irm_Ls, irm_Lu}
380 The set of "reference" is defined as:
383 The set of "num" is defined as:
386 The set of "data" is defined as:
387 data = {num || reference}
389 The set of "datab" is defined as:
390 datab = {data || irm_b }
392 The set of "dataM" is defined as:
393 dataM = {data || irm_M}
395 Vector "int" and "float" are defined by the arithmetic and vector_elem > 1.
397 /* Test for a certain class of modes. */
398 int mode_is_signed (const ir_mode *mode);
399 int mode_is_float (const ir_mode *mode);
400 int mode_is_int (const ir_mode *mode);
401 int mode_is_reference (const ir_mode *mode);
402 int mode_is_num (const ir_mode *mode);
403 int mode_is_data (const ir_mode *mode);
404 int mode_is_datab (const ir_mode *mode);
405 int mode_is_dataM (const ir_mode *mode);
406 int mode_is_float_vector (const ir_mode *mode);
407 int mode_is_int_vector (const ir_mode *mode);
410 /** Returns true if sm can be converted to lm without loss
411 according to firm definition */
412 int smaller_mode(const ir_mode *sm, const ir_mode *lm);
415 * Returns a matching unsigned mode for a given integer signed mode.
416 * Returns NULL if no matching mode exists.
418 ir_mode *find_unsigned_mode(const ir_mode *mode);
421 * Returns a matching signed mode for a given integer unsigned mode.
422 * Returns NULL if no matching mode exists.
424 ir_mode *find_signed_mode(const ir_mode *mode);
427 * Returns an integer mode with 2*n bits for a given integer mode with n bits.
428 * Returns NULL if no matching mode exists.
430 ir_mode *find_double_bits_int_mode(const ir_mode *mode);
433 * Returns non-zero if the given mode honors signed zero's, i.e.,
434 * a +0 and a -0 exists and handled differently.
436 int mode_honor_signed_zeros(const ir_mode *mode);
439 * Returns non-zero if the given mode might overflow on unary Minus.
441 int mode_overflow_on_unary_Minus(const ir_mode *mode);
444 * Returns non-zero if the mode has a reversed wrap-around
445 * logic, especially (a + x) - x == a.
446 * This is normally true for integer modes, not for floating
449 int mode_wrap_around(const ir_mode *mode);
452 * Return the signed integer equivalent mode for an reference mode.
454 ir_mode *get_reference_mode_signed_eq(ir_mode *mode);
457 * Sets the signed integer equivalent mode for an reference mode.
459 void set_reference_mode_signed_eq(ir_mode *ref_mode, ir_mode *int_mode);
462 * Return the unsigned integer equivalent mode for an reference mode.
464 ir_mode *get_reference_mode_unsigned_eq(ir_mode *mode);
467 * Sets the unsigned integer equivalent mode for an reference mode.
469 void set_reference_mode_unsigned_eq(ir_mode *ref_mode, ir_mode *int_mode);
472 * Returns non-zero if the cast from mode src to mode dst is a
473 * reinterpret cast (ie. only the bit pattern is reinterpreted,
474 * no conversion is done)
476 int is_reinterpret_cast(const ir_mode *src, const ir_mode *dst);