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79e68feb | 1 | /* Output variables, constants and external declarations, for GNU compiler. |
387e854a | 2 | Copyright (C) 1987, 1988, 1989, 1992, 1993 Free Software Foundation, Inc. |
79e68feb RS |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
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) | |
9 | any later version. | |
10 | ||
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. | |
15 | ||
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. */ | |
19 | ||
20 | ||
21 | /* This file handles generation of all the assembler code | |
22 | *except* the instructions of a function. | |
23 | This includes declarations of variables and their initial values. | |
24 | ||
25 | We also output the assembler code for constants stored in memory | |
26 | and are responsible for combining constants with the same value. */ | |
27 | ||
28 | #include <stdio.h> | |
29 | #include <setjmp.h> | |
30 | /* #include <stab.h> */ | |
31 | #include "config.h" | |
32 | #include "rtl.h" | |
33 | #include "tree.h" | |
34 | #include "flags.h" | |
57632c51 | 35 | #include "function.h" |
79e68feb RS |
36 | #include "expr.h" |
37 | #include "hard-reg-set.h" | |
38 | #include "regs.h" | |
9a631e8e | 39 | #include "defaults.h" |
24b09b50 | 40 | #include "real.h" |
79e68feb RS |
41 | |
42 | #include "obstack.h" | |
43 | ||
b4ac57ab | 44 | #ifdef XCOFF_DEBUGGING_INFO |
f246a305 | 45 | #include "xcoffout.h" |
b4ac57ab RS |
46 | #endif |
47 | ||
6baacf63 RS |
48 | #include <ctype.h> |
49 | ||
79e68feb RS |
50 | #ifndef ASM_STABS_OP |
51 | #define ASM_STABS_OP ".stabs" | |
52 | #endif | |
53 | ||
561e6650 RS |
54 | /* This macro gets just the user-specified name |
55 | out of the string in a SYMBOL_REF. On most machines, | |
56 | we discard the * if any and that's all. */ | |
57 | #ifndef STRIP_NAME_ENCODING | |
58 | #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME) \ | |
59 | (VAR) = ((SYMBOL_NAME) + ((SYMBOL_NAME)[0] == '*')) | |
60 | #endif | |
61 | ||
79e68feb RS |
62 | /* File in which assembler code is being written. */ |
63 | ||
64 | extern FILE *asm_out_file; | |
65 | ||
66 | /* The (assembler) name of the first globally-visible object output. */ | |
67 | char *first_global_object_name; | |
68 | ||
69 | extern struct obstack *current_obstack; | |
70 | extern struct obstack *saveable_obstack; | |
71 | extern struct obstack permanent_obstack; | |
72 | #define obstack_chunk_alloc xmalloc | |
79e68feb RS |
73 | |
74 | /* Number for making the label on the next | |
75 | constant that is stored in memory. */ | |
76 | ||
77 | int const_labelno; | |
78 | ||
79 | /* Number for making the label on the next | |
80 | static variable internal to a function. */ | |
81 | ||
82 | int var_labelno; | |
83 | ||
84 | /* Nonzero if at least one function definition has been seen. */ | |
85 | static int function_defined; | |
86 | ||
87 | extern FILE *asm_out_file; | |
88 | ||
89 | static char *compare_constant_1 (); | |
90 | static void record_constant_1 (); | |
ff8f4401 RS |
91 | static void output_constant_def_contents (); |
92 | ||
79e68feb RS |
93 | void output_constant_pool (); |
94 | void assemble_name (); | |
95 | int output_addressed_constants (); | |
96 | void output_constant (); | |
97 | void output_constructor (); | |
11435a40 TW |
98 | void text_section (); |
99 | void readonly_data_section (); | |
f246a305 | 100 | void data_section (); |
79e68feb RS |
101 | \f |
102 | #ifdef EXTRA_SECTIONS | |
103 | static enum in_section {no_section, in_text, in_data, EXTRA_SECTIONS} in_section | |
104 | = no_section; | |
105 | #else | |
106 | static enum in_section {no_section, in_text, in_data} in_section | |
107 | = no_section; | |
108 | #endif | |
109 | ||
110 | /* Define functions like text_section for any extra sections. */ | |
111 | #ifdef EXTRA_SECTION_FUNCTIONS | |
112 | EXTRA_SECTION_FUNCTIONS | |
113 | #endif | |
114 | ||
115 | /* Tell assembler to switch to text section. */ | |
116 | ||
117 | void | |
118 | text_section () | |
119 | { | |
120 | if (in_section != in_text) | |
121 | { | |
122 | fprintf (asm_out_file, "%s\n", TEXT_SECTION_ASM_OP); | |
123 | in_section = in_text; | |
124 | } | |
125 | } | |
126 | ||
79e68feb RS |
127 | /* Tell assembler to switch to data section. */ |
128 | ||
129 | void | |
130 | data_section () | |
131 | { | |
132 | if (in_section != in_data) | |
133 | { | |
134 | if (flag_shared_data) | |
135 | { | |
136 | #ifdef SHARED_SECTION_ASM_OP | |
137 | fprintf (asm_out_file, "%s\n", SHARED_SECTION_ASM_OP); | |
138 | #else | |
139 | fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP); | |
140 | #endif | |
141 | } | |
142 | else | |
143 | fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP); | |
144 | ||
145 | in_section = in_data; | |
146 | } | |
147 | } | |
148 | ||
7c6d68c8 RS |
149 | /* Tell assembler to switch to read-only data section. This is normally |
150 | the text section. */ | |
151 | ||
152 | void | |
153 | readonly_data_section () | |
154 | { | |
155 | #ifdef READONLY_DATA_SECTION | |
156 | READONLY_DATA_SECTION (); /* Note this can call data_section. */ | |
157 | #else | |
158 | text_section (); | |
159 | #endif | |
160 | } | |
161 | ||
79e68feb RS |
162 | /* Determine if we're in the text section. */ |
163 | ||
164 | int | |
165 | in_text_section () | |
166 | { | |
167 | return in_section == in_text; | |
168 | } | |
169 | \f | |
170 | /* Create the rtl to represent a function, for a function definition. | |
171 | DECL is a FUNCTION_DECL node which describes which function. | |
172 | The rtl is stored into DECL. */ | |
173 | ||
174 | void | |
175 | make_function_rtl (decl) | |
176 | tree decl; | |
177 | { | |
178 | char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); | |
179 | ||
180 | /* Rename a nested function to avoid conflicts. */ | |
181 | if (decl_function_context (decl) != 0 | |
182 | && DECL_INITIAL (decl) != 0 | |
183 | && DECL_RTL (decl) == 0) | |
184 | { | |
185 | char *label; | |
186 | ||
187 | name = IDENTIFIER_POINTER (DECL_NAME (decl)); | |
188 | ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno); | |
189 | name = obstack_copy0 (saveable_obstack, label, strlen (label)); | |
190 | var_labelno++; | |
191 | } | |
192 | ||
193 | if (DECL_RTL (decl) == 0) | |
194 | { | |
195 | DECL_RTL (decl) | |
196 | = gen_rtx (MEM, DECL_MODE (decl), | |
197 | gen_rtx (SYMBOL_REF, Pmode, name)); | |
198 | ||
199 | /* Optionally set flags or add text to the name to record information | |
200 | such as that it is a function name. If the name is changed, the macro | |
201 | ASM_OUTPUT_LABELREF will have to know how to strip this information. | |
202 | And if it finds a * at the beginning after doing so, it must handle | |
203 | that too. */ | |
204 | #ifdef ENCODE_SECTION_INFO | |
205 | ENCODE_SECTION_INFO (decl); | |
206 | #endif | |
207 | } | |
208 | ||
209 | /* Record at least one function has been defined. */ | |
210 | function_defined = 1; | |
211 | } | |
212 | ||
b4ac57ab RS |
213 | /* Given NAME, a putative register name, discard any customary prefixes. */ |
214 | ||
215 | static char * | |
216 | strip_reg_name (name) | |
217 | char *name; | |
218 | { | |
219 | #ifdef REGISTER_PREFIX | |
220 | if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX))) | |
221 | name += strlen (REGISTER_PREFIX); | |
222 | #endif | |
223 | if (name[0] == '%' || name[0] == '#') | |
224 | name++; | |
225 | return name; | |
226 | } | |
dcfedcd0 | 227 | \f |
79e68feb RS |
228 | /* Decode an `asm' spec for a declaration as a register name. |
229 | Return the register number, or -1 if nothing specified, | |
c09e6498 RS |
230 | or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized, |
231 | or -3 if ASMSPEC is `cc' and is not recognized, | |
232 | or -4 if ASMSPEC is `memory' and is not recognized. | |
dcfedcd0 RK |
233 | Accept an exact spelling or a decimal number. |
234 | Prefixes such as % are optional. */ | |
79e68feb RS |
235 | |
236 | int | |
237 | decode_reg_name (asmspec) | |
238 | char *asmspec; | |
239 | { | |
240 | if (asmspec != 0) | |
241 | { | |
242 | int i; | |
243 | ||
b4ac57ab RS |
244 | /* Get rid of confusing prefixes. */ |
245 | asmspec = strip_reg_name (asmspec); | |
246 | ||
fff9e713 MT |
247 | /* Allow a decimal number as a "register name". */ |
248 | for (i = strlen (asmspec) - 1; i >= 0; i--) | |
249 | if (! (asmspec[i] >= '0' && asmspec[i] <= '9')) | |
250 | break; | |
251 | if (asmspec[0] != 0 && i < 0) | |
252 | { | |
253 | i = atoi (asmspec); | |
254 | if (i < FIRST_PSEUDO_REGISTER && i >= 0) | |
255 | return i; | |
256 | else | |
257 | return -2; | |
258 | } | |
259 | ||
79e68feb | 260 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
b4ac57ab RS |
261 | if (reg_names[i][0] |
262 | && ! strcmp (asmspec, strip_reg_name (reg_names[i]))) | |
79e68feb RS |
263 | return i; |
264 | ||
79e68feb RS |
265 | #ifdef ADDITIONAL_REGISTER_NAMES |
266 | { | |
267 | static struct { char *name; int number; } table[] | |
268 | = ADDITIONAL_REGISTER_NAMES; | |
269 | ||
270 | for (i = 0; i < sizeof (table) / sizeof (table[0]); i++) | |
271 | if (! strcmp (asmspec, table[i].name)) | |
272 | return table[i].number; | |
79e68feb RS |
273 | } |
274 | #endif /* ADDITIONAL_REGISTER_NAMES */ | |
275 | ||
c09e6498 RS |
276 | if (!strcmp (asmspec, "memory")) |
277 | return -4; | |
278 | ||
dcfedcd0 RK |
279 | if (!strcmp (asmspec, "cc")) |
280 | return -3; | |
281 | ||
79e68feb RS |
282 | return -2; |
283 | } | |
284 | ||
285 | return -1; | |
286 | } | |
287 | \f | |
288 | /* Create the DECL_RTL for a declaration for a static or external variable | |
289 | or static or external function. | |
290 | ASMSPEC, if not 0, is the string which the user specified | |
291 | as the assembler symbol name. | |
292 | TOP_LEVEL is nonzero if this is a file-scope variable. | |
293 | ||
294 | This is never called for PARM_DECL nodes. */ | |
295 | ||
296 | void | |
297 | make_decl_rtl (decl, asmspec, top_level) | |
298 | tree decl; | |
299 | char *asmspec; | |
300 | int top_level; | |
301 | { | |
302 | register char *name; | |
303 | int reg_number = decode_reg_name (asmspec); | |
304 | ||
305 | if (DECL_ASSEMBLER_NAME (decl) != NULL_TREE) | |
306 | name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); | |
307 | ||
308 | if (reg_number == -2) | |
309 | { | |
310 | /* ASMSPEC is given, and not the name of a register. */ | |
311 | name = (char *) obstack_alloc (saveable_obstack, | |
312 | strlen (asmspec) + 2); | |
313 | name[0] = '*'; | |
314 | strcpy (&name[1], asmspec); | |
315 | } | |
316 | ||
317 | /* For a duplicate declaration, we can be called twice on the | |
ff8f4401 RS |
318 | same DECL node. Don't discard the RTL already made. */ |
319 | if (DECL_RTL (decl) == 0) | |
79e68feb RS |
320 | { |
321 | DECL_RTL (decl) = 0; | |
322 | ||
323 | /* First detect errors in declaring global registers. */ | |
44fe2e80 | 324 | if (DECL_REGISTER (decl) && reg_number == -1) |
79e68feb RS |
325 | error_with_decl (decl, |
326 | "register name not specified for `%s'"); | |
44fe2e80 | 327 | else if (DECL_REGISTER (decl) && reg_number < 0) |
79e68feb RS |
328 | error_with_decl (decl, |
329 | "invalid register name for `%s'"); | |
44fe2e80 | 330 | else if ((reg_number >= 0 || reg_number == -3) && ! DECL_REGISTER (decl)) |
79e68feb RS |
331 | error_with_decl (decl, |
332 | "register name given for non-register variable `%s'"); | |
44fe2e80 | 333 | else if (DECL_REGISTER (decl) && TREE_CODE (decl) == FUNCTION_DECL) |
79e68feb | 334 | error ("function declared `register'"); |
44fe2e80 | 335 | else if (DECL_REGISTER (decl) && TYPE_MODE (TREE_TYPE (decl)) == BLKmode) |
79e68feb | 336 | error_with_decl (decl, "data type of `%s' isn't suitable for a register"); |
ce2fb245 RS |
337 | else if (DECL_REGISTER (decl) |
338 | && ! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl)))) | |
339 | error_with_decl (decl, "register number for `%s' isn't suitable for the data type"); | |
79e68feb | 340 | /* Now handle properly declared static register variables. */ |
44fe2e80 | 341 | else if (DECL_REGISTER (decl)) |
79e68feb RS |
342 | { |
343 | int nregs; | |
344 | #if 0 /* yylex should print the warning for this */ | |
345 | if (pedantic) | |
346 | pedwarn ("ANSI C forbids global register variables"); | |
347 | #endif | |
348 | if (DECL_INITIAL (decl) != 0 && top_level) | |
349 | { | |
350 | DECL_INITIAL (decl) = 0; | |
351 | error ("global register variable has initial value"); | |
352 | } | |
353 | if (fixed_regs[reg_number] == 0 | |
354 | && function_defined && top_level) | |
355 | error ("global register variable follows a function definition"); | |
356 | if (TREE_THIS_VOLATILE (decl)) | |
357 | warning ("volatile register variables don't work as you might wish"); | |
31e4b1c0 RK |
358 | |
359 | /* If the user specified one of the eliminables registers here, | |
360 | e.g., FRAME_POINTER_REGNUM, we don't want to get this variable | |
361 | confused with that register and be eliminated. Although this | |
362 | usage is somewhat suspect, we nevertheless use the following | |
363 | kludge to avoid setting DECL_RTL to frame_pointer_rtx. */ | |
364 | ||
365 | DECL_RTL (decl) | |
366 | = gen_rtx (REG, DECL_MODE (decl), FIRST_PSEUDO_REGISTER); | |
367 | REGNO (DECL_RTL (decl)) = reg_number; | |
79e68feb RS |
368 | REG_USERVAR_P (DECL_RTL (decl)) = 1; |
369 | ||
370 | if (top_level) | |
371 | { | |
372 | /* Make this register fixed, so not usable for anything else. */ | |
373 | nregs = HARD_REGNO_NREGS (reg_number, DECL_MODE (decl)); | |
374 | while (nregs > 0) | |
375 | global_regs[reg_number + --nregs] = 1; | |
376 | init_reg_sets_1 (); | |
377 | } | |
378 | } | |
379 | ||
380 | /* Now handle ordinary static variables and functions (in memory). | |
381 | Also handle vars declared register invalidly. */ | |
382 | if (DECL_RTL (decl) == 0) | |
383 | { | |
384 | /* Can't use just the variable's own name for a variable | |
385 | whose scope is less than the whole file. | |
386 | Concatenate a distinguishing number. */ | |
44fe2e80 | 387 | if (!top_level && !DECL_EXTERNAL (decl) && asmspec == 0) |
79e68feb RS |
388 | { |
389 | char *label; | |
390 | ||
391 | ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno); | |
392 | name = obstack_copy0 (saveable_obstack, label, strlen (label)); | |
393 | var_labelno++; | |
394 | } | |
395 | ||
396 | DECL_RTL (decl) = gen_rtx (MEM, DECL_MODE (decl), | |
397 | gen_rtx (SYMBOL_REF, Pmode, name)); | |
0f15260a RS |
398 | if (TREE_THIS_VOLATILE (decl) |
399 | || (flag_volatile_global && TREE_CODE (decl) == VAR_DECL | |
400 | && TREE_PUBLIC (decl))) | |
79e68feb RS |
401 | MEM_VOLATILE_P (DECL_RTL (decl)) = 1; |
402 | if (TREE_READONLY (decl)) | |
403 | RTX_UNCHANGING_P (DECL_RTL (decl)) = 1; | |
404 | MEM_IN_STRUCT_P (DECL_RTL (decl)) | |
405 | = (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE | |
406 | || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
c1b98a95 RK |
407 | || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE |
408 | || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE); | |
79e68feb RS |
409 | |
410 | /* Optionally set flags or add text to the name to record information | |
411 | such as that it is a function name. | |
412 | If the name is changed, the macro ASM_OUTPUT_LABELREF | |
413 | will have to know how to strip this information. | |
414 | And if it finds a * at the beginning after doing so, | |
415 | it must handle that too. */ | |
416 | #ifdef ENCODE_SECTION_INFO | |
417 | ENCODE_SECTION_INFO (decl); | |
418 | #endif | |
419 | } | |
420 | } | |
ff8f4401 RS |
421 | /* If the old RTL had the wrong mode, fix the mode. */ |
422 | else if (GET_MODE (DECL_RTL (decl)) != DECL_MODE (decl)) | |
423 | { | |
424 | rtx rtl = DECL_RTL (decl); | |
425 | PUT_MODE (rtl, DECL_MODE (decl)); | |
426 | } | |
79e68feb | 427 | } |
4724d87a RS |
428 | |
429 | /* Make the rtl for variable VAR be volatile. | |
430 | Use this only for static variables. */ | |
431 | ||
fcbaecc6 | 432 | void |
4724d87a RS |
433 | make_var_volatile (var) |
434 | tree var; | |
435 | { | |
436 | if (GET_CODE (DECL_RTL (var)) != MEM) | |
437 | abort (); | |
438 | ||
439 | MEM_VOLATILE_P (DECL_RTL (var)) = 1; | |
440 | } | |
79e68feb | 441 | \f |
d447ec6f RS |
442 | /* Output alignment directive to align for constant expression EXP. */ |
443 | ||
444 | void | |
445 | assemble_constant_align (exp) | |
446 | tree exp; | |
447 | { | |
448 | int align; | |
449 | ||
450 | /* Align the location counter as required by EXP's data type. */ | |
451 | align = TYPE_ALIGN (TREE_TYPE (exp)); | |
452 | #ifdef CONSTANT_ALIGNMENT | |
453 | align = CONSTANT_ALIGNMENT (exp, align); | |
454 | #endif | |
455 | ||
456 | if (align > BITS_PER_UNIT) | |
457 | ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT)); | |
458 | } | |
459 | ||
79e68feb RS |
460 | /* Output a string of literal assembler code |
461 | for an `asm' keyword used between functions. */ | |
462 | ||
463 | void | |
464 | assemble_asm (string) | |
465 | tree string; | |
466 | { | |
467 | app_enable (); | |
468 | ||
469 | if (TREE_CODE (string) == ADDR_EXPR) | |
470 | string = TREE_OPERAND (string, 0); | |
471 | ||
472 | fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string)); | |
473 | } | |
474 | ||
9bb2e4fe RS |
475 | #if 0 /* This should no longer be needed, because |
476 | flag_gnu_linker should be 0 on these systems, | |
477 | which should prevent any output | |
478 | if ASM_OUTPUT_CONSTRUCTOR and ASM_OUTPUT_DESTRUCTOR are absent. */ | |
79e68feb RS |
479 | #if !(defined(DBX_DEBUGGING_INFO) && !defined(FASCIST_ASSEMBLER)) |
480 | #ifndef ASM_OUTPUT_CONSTRUCTOR | |
481 | #define ASM_OUTPUT_CONSTRUCTOR(file, name) | |
482 | #endif | |
483 | #ifndef ASM_OUTPUT_DESTRUCTOR | |
484 | #define ASM_OUTPUT_DESTRUCTOR(file, name) | |
485 | #endif | |
486 | #endif | |
9bb2e4fe | 487 | #endif /* 0 */ |
79e68feb RS |
488 | |
489 | /* Record an element in the table of global destructors. | |
490 | How this is done depends on what sort of assembler and linker | |
491 | are in use. | |
492 | ||
493 | NAME should be the name of a global function to be called | |
494 | at exit time. This name is output using assemble_name. */ | |
495 | ||
496 | void | |
497 | assemble_destructor (name) | |
498 | char *name; | |
499 | { | |
500 | #ifdef ASM_OUTPUT_DESTRUCTOR | |
501 | ASM_OUTPUT_DESTRUCTOR (asm_out_file, name); | |
502 | #else | |
503 | if (flag_gnu_linker) | |
504 | { | |
505 | /* Now tell GNU LD that this is part of the static destructor set. */ | |
506 | /* This code works for any machine provided you use GNU as/ld. */ | |
507 | fprintf (asm_out_file, "%s \"___DTOR_LIST__\",22,0,0,", ASM_STABS_OP); | |
508 | assemble_name (asm_out_file, name); | |
509 | fputc ('\n', asm_out_file); | |
510 | } | |
511 | #endif | |
512 | } | |
513 | ||
514 | /* Likewise for global constructors. */ | |
515 | ||
516 | void | |
517 | assemble_constructor (name) | |
518 | char *name; | |
519 | { | |
520 | #ifdef ASM_OUTPUT_CONSTRUCTOR | |
521 | ASM_OUTPUT_CONSTRUCTOR (asm_out_file, name); | |
522 | #else | |
523 | if (flag_gnu_linker) | |
524 | { | |
525 | /* Now tell GNU LD that this is part of the static constructor set. */ | |
526 | /* This code works for any machine provided you use GNU as/ld. */ | |
527 | fprintf (asm_out_file, "%s \"___CTOR_LIST__\",22,0,0,", ASM_STABS_OP); | |
528 | assemble_name (asm_out_file, name); | |
529 | fputc ('\n', asm_out_file); | |
530 | } | |
531 | #endif | |
532 | } | |
533 | ||
534 | /* Likewise for entries we want to record for garbage collection. | |
535 | Garbage collection is still under development. */ | |
536 | ||
537 | void | |
538 | assemble_gc_entry (name) | |
539 | char *name; | |
540 | { | |
541 | #ifdef ASM_OUTPUT_GC_ENTRY | |
542 | ASM_OUTPUT_GC_ENTRY (asm_out_file, name); | |
543 | #else | |
544 | if (flag_gnu_linker) | |
545 | { | |
546 | /* Now tell GNU LD that this is part of the static constructor set. */ | |
547 | fprintf (asm_out_file, "%s \"___PTR_LIST__\",22,0,0,", ASM_STABS_OP); | |
548 | assemble_name (asm_out_file, name); | |
549 | fputc ('\n', asm_out_file); | |
550 | } | |
551 | #endif | |
552 | } | |
553 | \f | |
554 | /* Output assembler code for the constant pool of a function and associated | |
555 | with defining the name of the function. DECL describes the function. | |
556 | NAME is the function's name. For the constant pool, we use the current | |
557 | constant pool data. */ | |
558 | ||
559 | void | |
560 | assemble_start_function (decl, fnname) | |
561 | tree decl; | |
562 | char *fnname; | |
563 | { | |
564 | int align; | |
565 | ||
566 | /* The following code does not need preprocessing in the assembler. */ | |
567 | ||
568 | app_disable (); | |
569 | ||
570 | output_constant_pool (fnname, decl); | |
571 | ||
572 | text_section (); | |
573 | ||
574 | ||
575 | /* Tell assembler to move to target machine's alignment for functions. */ | |
576 | align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
577 | if (align > 0) | |
578 | ASM_OUTPUT_ALIGN (asm_out_file, align); | |
579 | ||
580 | #ifdef ASM_OUTPUT_FUNCTION_PREFIX | |
581 | ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname); | |
582 | #endif | |
583 | ||
584 | #ifdef SDB_DEBUGGING_INFO | |
585 | /* Output SDB definition of the function. */ | |
586 | if (write_symbols == SDB_DEBUG) | |
587 | sdbout_mark_begin_function (); | |
588 | #endif | |
589 | ||
590 | #ifdef DBX_DEBUGGING_INFO | |
e5c90c23 | 591 | /* Output DBX definition of the function. */ |
79e68feb | 592 | if (write_symbols == DBX_DEBUG) |
e5c90c23 | 593 | dbxout_begin_function (decl); |
79e68feb RS |
594 | #endif |
595 | ||
596 | /* Make function name accessible from other files, if appropriate. */ | |
597 | ||
598 | if (TREE_PUBLIC (decl)) | |
599 | { | |
600 | if (!first_global_object_name) | |
561e6650 | 601 | STRIP_NAME_ENCODING (first_global_object_name, fnname); |
79e68feb RS |
602 | ASM_GLOBALIZE_LABEL (asm_out_file, fnname); |
603 | } | |
604 | ||
605 | /* Do any machine/system dependent processing of the function name */ | |
606 | #ifdef ASM_DECLARE_FUNCTION_NAME | |
607 | ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl); | |
608 | #else | |
609 | /* Standard thing is just output label for the function. */ | |
610 | ASM_OUTPUT_LABEL (asm_out_file, fnname); | |
611 | #endif /* ASM_DECLARE_FUNCTION_NAME */ | |
612 | } | |
613 | ||
614 | /* Output assembler code associated with defining the size of the | |
615 | function. DECL describes the function. NAME is the function's name. */ | |
616 | ||
617 | void | |
618 | assemble_end_function (decl, fnname) | |
619 | tree decl; | |
620 | char *fnname; | |
621 | { | |
622 | #ifdef ASM_DECLARE_FUNCTION_SIZE | |
623 | ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl); | |
624 | #endif | |
625 | } | |
626 | \f | |
627 | /* Assemble code to leave SIZE bytes of zeros. */ | |
628 | ||
629 | void | |
630 | assemble_zeros (size) | |
631 | int size; | |
632 | { | |
633 | #ifdef ASM_NO_SKIP_IN_TEXT | |
634 | /* The `space' pseudo in the text section outputs nop insns rather than 0s, | |
635 | so we must output 0s explicitly in the text section. */ | |
636 | if (ASM_NO_SKIP_IN_TEXT && in_text_section ()) | |
637 | { | |
638 | int i; | |
639 | ||
640 | for (i = 0; i < size - 20; i += 20) | |
641 | { | |
642 | #ifdef ASM_BYTE_OP | |
643 | fprintf (asm_out_file, | |
644 | "%s 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\n", ASM_BYTE_OP); | |
645 | #else | |
646 | fprintf (asm_out_file, | |
647 | "\tbyte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\n"); | |
648 | #endif | |
649 | } | |
650 | if (i < size) | |
651 | { | |
652 | #ifdef ASM_BYTE_OP | |
653 | fprintf (asm_out_file, "%s 0", ASM_BYTE_OP); | |
654 | #else | |
655 | fprintf (asm_out_file, "\tbyte 0"); | |
656 | #endif | |
657 | i++; | |
658 | for (; i < size; i++) | |
659 | fprintf (asm_out_file, ",0"); | |
660 | fprintf (asm_out_file, "\n"); | |
661 | } | |
662 | } | |
663 | else | |
664 | #endif | |
41fe4d9e RS |
665 | if (size > 0) |
666 | ASM_OUTPUT_SKIP (asm_out_file, size); | |
79e68feb RS |
667 | } |
668 | ||
a785e67e RS |
669 | /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */ |
670 | ||
671 | void | |
672 | assemble_align (align) | |
673 | int align; | |
674 | { | |
675 | if (align > BITS_PER_UNIT) | |
676 | ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT)); | |
677 | } | |
678 | ||
79e68feb RS |
679 | /* Assemble a string constant with the specified C string as contents. */ |
680 | ||
681 | void | |
682 | assemble_string (p, size) | |
fcbaecc6 | 683 | char *p; |
79e68feb RS |
684 | int size; |
685 | { | |
686 | register int i; | |
687 | int pos = 0; | |
688 | int maximum = 2000; | |
689 | ||
690 | /* If the string is very long, split it up. */ | |
691 | ||
692 | while (pos < size) | |
693 | { | |
694 | int thissize = size - pos; | |
695 | if (thissize > maximum) | |
696 | thissize = maximum; | |
697 | ||
79e68feb | 698 | ASM_OUTPUT_ASCII (asm_out_file, p, thissize); |
79e68feb RS |
699 | |
700 | pos += thissize; | |
701 | p += thissize; | |
702 | } | |
703 | } | |
704 | \f | |
705 | /* Assemble everything that is needed for a variable or function declaration. | |
706 | Not used for automatic variables, and not used for function definitions. | |
707 | Should not be called for variables of incomplete structure type. | |
708 | ||
709 | TOP_LEVEL is nonzero if this variable has file scope. | |
710 | AT_END is nonzero if this is the special handling, at end of compilation, | |
ff8f4401 RS |
711 | to define things that have had only tentative definitions. |
712 | DONT_OUTPUT_DATA if nonzero means don't actually output the | |
713 | initial value (that will be done by the caller). */ | |
79e68feb RS |
714 | |
715 | void | |
ff8f4401 | 716 | assemble_variable (decl, top_level, at_end, dont_output_data) |
79e68feb RS |
717 | tree decl; |
718 | int top_level; | |
719 | int at_end; | |
720 | { | |
721 | register char *name; | |
722 | int align; | |
723 | tree size_tree; | |
724 | int reloc = 0; | |
edbc355b | 725 | enum in_section saved_in_section; |
79e68feb RS |
726 | |
727 | if (GET_CODE (DECL_RTL (decl)) == REG) | |
728 | { | |
729 | /* Do output symbol info for global register variables, but do nothing | |
730 | else for them. */ | |
731 | ||
732 | if (TREE_ASM_WRITTEN (decl)) | |
733 | return; | |
734 | TREE_ASM_WRITTEN (decl) = 1; | |
735 | ||
b4ac57ab | 736 | #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) |
79e68feb | 737 | /* File-scope global variables are output here. */ |
b4ac57ab RS |
738 | if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) |
739 | && top_level) | |
79e68feb RS |
740 | dbxout_symbol (decl, 0); |
741 | #endif | |
742 | #ifdef SDB_DEBUGGING_INFO | |
743 | if (write_symbols == SDB_DEBUG && top_level | |
744 | /* Leave initialized global vars for end of compilation; | |
745 | see comment in compile_file. */ | |
746 | && (TREE_PUBLIC (decl) == 0 || DECL_INITIAL (decl) == 0)) | |
747 | sdbout_symbol (decl, 0); | |
748 | #endif | |
749 | ||
750 | /* Don't output any DWARF debugging information for variables here. | |
751 | In the case of local variables, the information for them is output | |
752 | when we do our recursive traversal of the tree representation for | |
753 | the entire containing function. In the case of file-scope variables, | |
754 | we output information for all of them at the very end of compilation | |
755 | while we are doing our final traversal of the chain of file-scope | |
756 | declarations. */ | |
757 | ||
758 | return; | |
759 | } | |
760 | ||
d36d70cc RK |
761 | /* Normally no need to say anything here for external references, |
762 | since assemble_external is called by the langauge-specific code | |
763 | when a declaration is first seen. */ | |
79e68feb | 764 | |
44fe2e80 | 765 | if (DECL_EXTERNAL (decl)) |
79e68feb RS |
766 | return; |
767 | ||
768 | /* Output no assembler code for a function declaration. | |
769 | Only definitions of functions output anything. */ | |
770 | ||
771 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
772 | return; | |
773 | ||
774 | /* If type was incomplete when the variable was declared, | |
775 | see if it is complete now. */ | |
776 | ||
777 | if (DECL_SIZE (decl) == 0) | |
778 | layout_decl (decl, 0); | |
779 | ||
780 | /* Still incomplete => don't allocate it; treat the tentative defn | |
781 | (which is what it must have been) as an `extern' reference. */ | |
782 | ||
ff8f4401 | 783 | if (!dont_output_data && DECL_SIZE (decl) == 0) |
79e68feb RS |
784 | { |
785 | error_with_file_and_line (DECL_SOURCE_FILE (decl), | |
786 | DECL_SOURCE_LINE (decl), | |
ea80ee44 | 787 | "storage size of `%s' isn't known", |
79e68feb RS |
788 | IDENTIFIER_POINTER (DECL_NAME (decl))); |
789 | return; | |
790 | } | |
791 | ||
792 | /* The first declaration of a variable that comes through this function | |
793 | decides whether it is global (in C, has external linkage) | |
794 | or local (in C, has internal linkage). So do nothing more | |
795 | if this function has already run. */ | |
796 | ||
797 | if (TREE_ASM_WRITTEN (decl)) | |
798 | return; | |
799 | ||
800 | TREE_ASM_WRITTEN (decl) = 1; | |
801 | ||
79e68feb RS |
802 | /* If storage size is erroneously variable, just continue. |
803 | Error message was already made. */ | |
804 | ||
ff8f4401 RS |
805 | if (DECL_SIZE (decl)) |
806 | { | |
807 | if (TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST) | |
808 | goto finish; | |
79e68feb | 809 | |
ff8f4401 | 810 | app_disable (); |
79e68feb | 811 | |
ff8f4401 RS |
812 | /* This is better than explicit arithmetic, since it avoids overflow. */ |
813 | size_tree = size_binop (CEIL_DIV_EXPR, | |
814 | DECL_SIZE (decl), size_int (BITS_PER_UNIT)); | |
79e68feb | 815 | |
ff8f4401 RS |
816 | if (TREE_INT_CST_HIGH (size_tree) != 0) |
817 | { | |
818 | error_with_decl (decl, "size of variable `%s' is too large"); | |
819 | goto finish; | |
820 | } | |
79e68feb RS |
821 | } |
822 | ||
823 | name = XSTR (XEXP (DECL_RTL (decl), 0), 0); | |
824 | ||
825 | /* Handle uninitialized definitions. */ | |
826 | ||
827 | /* ANSI specifies that a tentative definition which is not merged with | |
828 | a non-tentative definition behaves exactly like a definition with an | |
829 | initializer equal to zero. (Section 3.7.2) | |
21432660 JW |
830 | -fno-common gives strict ANSI behavior. Usually you don't want it. |
831 | This matters only for variables with external linkage. */ | |
832 | if ((! flag_no_common || ! TREE_PUBLIC (decl)) | |
ff8f4401 | 833 | && ! dont_output_data |
79e68feb RS |
834 | && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node)) |
835 | { | |
836 | int size = TREE_INT_CST_LOW (size_tree); | |
837 | int rounded = size; | |
838 | ||
839 | if (TREE_INT_CST_HIGH (size_tree) != 0) | |
840 | error_with_decl (decl, "size of variable `%s' is too large"); | |
841 | /* Don't allocate zero bytes of common, | |
842 | since that means "undefined external" in the linker. */ | |
843 | if (size == 0) rounded = 1; | |
844 | /* Round size up to multiple of BIGGEST_ALIGNMENT bits | |
845 | so that each uninitialized object starts on such a boundary. */ | |
846 | rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; | |
847 | rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) | |
848 | * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); | |
edbc355b RS |
849 | |
850 | #ifdef DBX_DEBUGGING_INFO | |
851 | /* File-scope global variables are output here. */ | |
852 | if (write_symbols == DBX_DEBUG && top_level) | |
853 | dbxout_symbol (decl, 0); | |
854 | #endif | |
855 | #ifdef SDB_DEBUGGING_INFO | |
856 | if (write_symbols == SDB_DEBUG && top_level | |
857 | /* Leave initialized global vars for end of compilation; | |
858 | see comment in compile_file. */ | |
859 | && (TREE_PUBLIC (decl) == 0 || DECL_INITIAL (decl) == 0)) | |
860 | sdbout_symbol (decl, 0); | |
861 | #endif | |
862 | ||
863 | /* Don't output any DWARF debugging information for variables here. | |
864 | In the case of local variables, the information for them is output | |
865 | when we do our recursive traversal of the tree representation for | |
866 | the entire containing function. In the case of file-scope variables, | |
867 | we output information for all of them at the very end of compilation | |
868 | while we are doing our final traversal of the chain of file-scope | |
869 | declarations. */ | |
870 | ||
79e68feb RS |
871 | #if 0 |
872 | if (flag_shared_data) | |
873 | data_section (); | |
874 | #endif | |
875 | if (TREE_PUBLIC (decl)) | |
876 | { | |
877 | #ifdef ASM_OUTPUT_SHARED_COMMON | |
878 | if (flag_shared_data) | |
879 | ASM_OUTPUT_SHARED_COMMON (asm_out_file, name, size, rounded); | |
880 | else | |
881 | #endif | |
882 | #ifdef ASM_OUTPUT_ALIGNED_COMMON | |
883 | ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, | |
884 | DECL_ALIGN (decl)); | |
885 | #else | |
886 | ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded); | |
887 | #endif | |
888 | } | |
889 | else | |
890 | { | |
891 | #ifdef ASM_OUTPUT_SHARED_LOCAL | |
892 | if (flag_shared_data) | |
893 | ASM_OUTPUT_SHARED_LOCAL (asm_out_file, name, size, rounded); | |
894 | else | |
895 | #endif | |
896 | #ifdef ASM_OUTPUT_ALIGNED_LOCAL | |
897 | ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, | |
898 | DECL_ALIGN (decl)); | |
899 | #else | |
900 | ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded); | |
901 | #endif | |
902 | } | |
b4ac57ab | 903 | goto finish; |
79e68feb RS |
904 | } |
905 | ||
906 | /* Handle initialized definitions. */ | |
907 | ||
908 | /* First make the assembler name(s) global if appropriate. */ | |
909 | if (TREE_PUBLIC (decl) && DECL_NAME (decl)) | |
910 | { | |
911 | if (!first_global_object_name) | |
561e6650 | 912 | STRIP_NAME_ENCODING(first_global_object_name, name); |
79e68feb RS |
913 | ASM_GLOBALIZE_LABEL (asm_out_file, name); |
914 | } | |
915 | #if 0 | |
916 | for (d = equivalents; d; d = TREE_CHAIN (d)) | |
917 | { | |
918 | tree e = TREE_VALUE (d); | |
919 | if (TREE_PUBLIC (e) && DECL_NAME (e)) | |
920 | ASM_GLOBALIZE_LABEL (asm_out_file, | |
921 | XSTR (XEXP (DECL_RTL (e), 0), 0)); | |
922 | } | |
923 | #endif | |
924 | ||
925 | /* Output any data that we will need to use the address of. */ | |
926 | if (DECL_INITIAL (decl)) | |
927 | reloc = output_addressed_constants (DECL_INITIAL (decl)); | |
928 | ||
929 | /* Switch to the proper section for this data. */ | |
930 | #ifdef SELECT_SECTION | |
931 | SELECT_SECTION (decl, reloc); | |
932 | #else | |
933 | if (TREE_READONLY (decl) | |
934 | && ! TREE_THIS_VOLATILE (decl) | |
935 | && ! (flag_pic && reloc)) | |
936 | readonly_data_section (); | |
937 | else | |
938 | data_section (); | |
939 | #endif | |
940 | ||
edbc355b RS |
941 | /* Record current section so we can restore it if dbxout.c clobbers it. */ |
942 | saved_in_section = in_section; | |
943 | ||
944 | /* Output the dbx info now that we have chosen the section. */ | |
945 | ||
946 | #ifdef DBX_DEBUGGING_INFO | |
947 | /* File-scope global variables are output here. */ | |
948 | if (write_symbols == DBX_DEBUG && top_level) | |
949 | dbxout_symbol (decl, 0); | |
950 | #endif | |
951 | #ifdef SDB_DEBUGGING_INFO | |
952 | if (write_symbols == SDB_DEBUG && top_level | |
953 | /* Leave initialized global vars for end of compilation; | |
954 | see comment in compile_file. */ | |
955 | && (TREE_PUBLIC (decl) == 0 || DECL_INITIAL (decl) == 0)) | |
956 | sdbout_symbol (decl, 0); | |
957 | #endif | |
958 | ||
959 | /* Don't output any DWARF debugging information for variables here. | |
960 | In the case of local variables, the information for them is output | |
961 | when we do our recursive traversal of the tree representation for | |
962 | the entire containing function. In the case of file-scope variables, | |
963 | we output information for all of them at the very end of compilation | |
964 | while we are doing our final traversal of the chain of file-scope | |
965 | declarations. */ | |
966 | ||
967 | if (in_section != saved_in_section) | |
968 | { | |
969 | /* Switch to the proper section for this data. */ | |
970 | #ifdef SELECT_SECTION | |
971 | SELECT_SECTION (decl, reloc); | |
972 | #else | |
973 | if (TREE_READONLY (decl) | |
974 | && ! TREE_THIS_VOLATILE (decl) | |
975 | && ! (flag_pic && reloc)) | |
976 | readonly_data_section (); | |
977 | else | |
978 | data_section (); | |
979 | #endif | |
980 | } | |
981 | ||
79e68feb RS |
982 | /* Compute and output the alignment of this data. */ |
983 | ||
984 | align = DECL_ALIGN (decl); | |
a785e67e RS |
985 | /* In the case for initialing an array whose length isn't specified, |
986 | where we have not yet been able to do the layout, | |
987 | figure out the proper alignment now. */ | |
988 | if (dont_output_data && DECL_SIZE (decl) == 0 | |
989 | && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) | |
990 | align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl)))); | |
991 | ||
79e68feb RS |
992 | /* Some object file formats have a maximum alignment which they support. |
993 | In particular, a.out format supports a maximum alignment of 4. */ | |
994 | #ifndef MAX_OFILE_ALIGNMENT | |
995 | #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT | |
996 | #endif | |
997 | if (align > MAX_OFILE_ALIGNMENT) | |
998 | { | |
999 | warning_with_decl (decl, | |
1000 | "alignment of `%s' is greater than maximum object file alignment"); | |
1001 | align = MAX_OFILE_ALIGNMENT; | |
1002 | } | |
1003 | #ifdef DATA_ALIGNMENT | |
1004 | /* On some machines, it is good to increase alignment sometimes. */ | |
1005 | align = DATA_ALIGNMENT (TREE_TYPE (decl), align); | |
1006 | #endif | |
1007 | #ifdef CONSTANT_ALIGNMENT | |
1008 | if (DECL_INITIAL (decl)) | |
1009 | align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align); | |
1010 | #endif | |
1011 | ||
1012 | /* Reset the alignment in case we have made it tighter, so we can benefit | |
1013 | from it in get_pointer_alignment. */ | |
1014 | DECL_ALIGN (decl) = align; | |
1015 | ||
1016 | if (align > BITS_PER_UNIT) | |
1017 | ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT)); | |
1018 | ||
1019 | /* Do any machine/system dependent processing of the object. */ | |
1020 | #ifdef ASM_DECLARE_OBJECT_NAME | |
1021 | ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl); | |
1022 | #else | |
1023 | /* Standard thing is just output label for the object. */ | |
1024 | ASM_OUTPUT_LABEL (asm_out_file, name); | |
1025 | #endif /* ASM_DECLARE_OBJECT_NAME */ | |
1026 | ||
ff8f4401 | 1027 | if (!dont_output_data) |
79e68feb | 1028 | { |
ff8f4401 RS |
1029 | if (DECL_INITIAL (decl)) |
1030 | /* Output the actual data. */ | |
1031 | output_constant (DECL_INITIAL (decl), | |
1032 | int_size_in_bytes (TREE_TYPE (decl))); | |
1033 | else | |
1034 | /* Leave space for it. */ | |
1035 | assemble_zeros (int_size_in_bytes (TREE_TYPE (decl))); | |
79e68feb | 1036 | } |
b4ac57ab RS |
1037 | |
1038 | finish: | |
1039 | #ifdef XCOFF_DEBUGGING_INFO | |
1040 | /* Unfortunately, the IBM assembler cannot handle stabx before the actual | |
1041 | declaration. When something like ".stabx "aa:S-2",aa,133,0" is emitted | |
1042 | and `aa' hasn't been output yet, the assembler generates a stab entry with | |
1043 | a value of zero, in addition to creating an unnecessary external entry | |
6dc42e49 | 1044 | for `aa'. Hence, we must postpone dbxout_symbol to here at the end. */ |
b4ac57ab RS |
1045 | |
1046 | /* File-scope global variables are output here. */ | |
1047 | if (write_symbols == XCOFF_DEBUG && top_level) | |
1048 | dbxout_symbol (decl, 0); | |
1049 | #else | |
1050 | /* There must be a statement after a label. */ | |
1051 | ; | |
1052 | #endif | |
79e68feb RS |
1053 | } |
1054 | ||
1055 | /* Output something to declare an external symbol to the assembler. | |
fff9e713 MT |
1056 | (Most assemblers don't need this, so we normally output nothing.) |
1057 | Do nothing if DECL is not external. */ | |
79e68feb RS |
1058 | |
1059 | void | |
1060 | assemble_external (decl) | |
1061 | tree decl; | |
1062 | { | |
79e68feb | 1063 | #ifdef ASM_OUTPUT_EXTERNAL |
fff9e713 | 1064 | if (TREE_CODE_CLASS (TREE_CODE (decl)) == 'd' |
44fe2e80 | 1065 | && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl)) |
79e68feb | 1066 | { |
fff9e713 MT |
1067 | rtx rtl = DECL_RTL (decl); |
1068 | ||
1069 | if (GET_CODE (rtl) == MEM && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF | |
1070 | && ! SYMBOL_REF_USED (XEXP (rtl, 0))) | |
1071 | { | |
1072 | /* Some systems do require some output. */ | |
1073 | SYMBOL_REF_USED (XEXP (rtl, 0)) = 1; | |
1074 | ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0)); | |
1075 | } | |
79e68feb RS |
1076 | } |
1077 | #endif | |
1078 | } | |
1079 | ||
1080 | /* Similar, for calling a library function FUN. */ | |
1081 | ||
1082 | void | |
1083 | assemble_external_libcall (fun) | |
1084 | rtx fun; | |
1085 | { | |
1086 | #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL | |
1087 | /* Declare library function name external when first used, if nec. */ | |
1088 | if (! SYMBOL_REF_USED (fun)) | |
1089 | { | |
1090 | SYMBOL_REF_USED (fun) = 1; | |
1091 | ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun); | |
1092 | } | |
1093 | #endif | |
1094 | } | |
1095 | ||
1096 | /* Declare the label NAME global. */ | |
1097 | ||
1098 | void | |
1099 | assemble_global (name) | |
1100 | char *name; | |
1101 | { | |
1102 | ASM_GLOBALIZE_LABEL (asm_out_file, name); | |
1103 | } | |
1104 | ||
1105 | /* Assemble a label named NAME. */ | |
1106 | ||
1107 | void | |
1108 | assemble_label (name) | |
1109 | char *name; | |
1110 | { | |
1111 | ASM_OUTPUT_LABEL (asm_out_file, name); | |
1112 | } | |
1113 | ||
1114 | /* Output to FILE a reference to the assembler name of a C-level name NAME. | |
1115 | If NAME starts with a *, the rest of NAME is output verbatim. | |
1116 | Otherwise NAME is transformed in an implementation-defined way | |
1117 | (usually by the addition of an underscore). | |
1118 | Many macros in the tm file are defined to call this function. */ | |
1119 | ||
1120 | void | |
1121 | assemble_name (file, name) | |
1122 | FILE *file; | |
1123 | char *name; | |
1124 | { | |
1125 | if (name[0] == '*') | |
1126 | fputs (&name[1], file); | |
1127 | else | |
1128 | ASM_OUTPUT_LABELREF (file, name); | |
1129 | } | |
1130 | ||
1131 | /* Allocate SIZE bytes writable static space with a gensym name | |
1132 | and return an RTX to refer to its address. */ | |
1133 | ||
1134 | rtx | |
1135 | assemble_static_space (size) | |
1136 | int size; | |
1137 | { | |
1138 | char name[12]; | |
1139 | char *namestring; | |
1140 | rtx x; | |
1141 | /* Round size up to multiple of BIGGEST_ALIGNMENT bits | |
1142 | so that each uninitialized object starts on such a boundary. */ | |
1143 | int rounded = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1) | |
1144 | / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) | |
1145 | * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); | |
1146 | ||
1147 | #if 0 | |
1148 | if (flag_shared_data) | |
1149 | data_section (); | |
1150 | #endif | |
1151 | ||
1152 | ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno); | |
1153 | ++const_labelno; | |
1154 | ||
1155 | namestring = (char *) obstack_alloc (saveable_obstack, | |
1156 | strlen (name) + 2); | |
1157 | strcpy (namestring, name); | |
1158 | ||
1159 | x = gen_rtx (SYMBOL_REF, Pmode, namestring); | |
1160 | #ifdef ASM_OUTPUT_ALIGNED_LOCAL | |
1161 | ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT); | |
1162 | #else | |
1163 | ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded); | |
1164 | #endif | |
1165 | return x; | |
1166 | } | |
1167 | ||
1168 | /* Assemble the static constant template for function entry trampolines. | |
1169 | This is done at most once per compilation. | |
1170 | Returns an RTX for the address of the template. */ | |
1171 | ||
1172 | rtx | |
1173 | assemble_trampoline_template () | |
1174 | { | |
1175 | char label[256]; | |
1176 | char *name; | |
1177 | int align; | |
1178 | ||
37552631 | 1179 | /* By default, put trampoline templates in read-only data section. */ |
f49acdb4 | 1180 | |
37552631 RS |
1181 | #ifdef TRAMPOLINE_SECTION |
1182 | TRAMPOLINE_SECTION (); | |
1183 | #else | |
c8c29f85 | 1184 | readonly_data_section (); |
37552631 | 1185 | #endif |
f49acdb4 | 1186 | |
79e68feb RS |
1187 | /* Write the assembler code to define one. */ |
1188 | align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
1189 | if (align > 0) | |
1190 | ASM_OUTPUT_ALIGN (asm_out_file, align); | |
1191 | ||
1192 | ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LTRAMP", 0); | |
1193 | TRAMPOLINE_TEMPLATE (asm_out_file); | |
1194 | ||
1195 | /* Record the rtl to refer to it. */ | |
1196 | ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0); | |
1197 | name | |
1198 | = (char *) obstack_copy0 (&permanent_obstack, label, strlen (label)); | |
1199 | return gen_rtx (SYMBOL_REF, Pmode, name); | |
1200 | } | |
1201 | \f | |
1202 | /* Assemble the integer constant X into an object of SIZE bytes. | |
1203 | X must be either a CONST_INT or CONST_DOUBLE. | |
1204 | ||
1205 | Return 1 if we were able to output the constant, otherwise 0. If FORCE is | |
1206 | non-zero, abort if we can't output the constant. */ | |
1207 | ||
1208 | int | |
1209 | assemble_integer (x, size, force) | |
1210 | rtx x; | |
1211 | int size; | |
1212 | int force; | |
1213 | { | |
1214 | /* First try to use the standard 1, 2, 4, 8, and 16 byte | |
1215 | ASM_OUTPUT... macros. */ | |
1216 | ||
1217 | switch (size) | |
1218 | { | |
1219 | #ifdef ASM_OUTPUT_CHAR | |
1220 | case 1: | |
1221 | ASM_OUTPUT_CHAR (asm_out_file, x); | |
1222 | return 1; | |
1223 | #endif | |
1224 | ||
1225 | #ifdef ASM_OUTPUT_SHORT | |
1226 | case 2: | |
1227 | ASM_OUTPUT_SHORT (asm_out_file, x); | |
1228 | return 1; | |
1229 | #endif | |
1230 | ||
1231 | #ifdef ASM_OUTPUT_INT | |
1232 | case 4: | |
1233 | ASM_OUTPUT_INT (asm_out_file, x); | |
1234 | return 1; | |
1235 | #endif | |
1236 | ||
1237 | #ifdef ASM_OUTPUT_DOUBLE_INT | |
1238 | case 8: | |
1239 | ASM_OUTPUT_DOUBLE_INT (asm_out_file, x); | |
1240 | return 1; | |
1241 | #endif | |
1242 | ||
1243 | #ifdef ASM_OUTPUT_QUADRUPLE_INT | |
1244 | case 16: | |
1245 | ASM_OUTPUT_QUADRUPLE_INT (asm_out_file, x); | |
1246 | return 1; | |
1247 | #endif | |
1248 | } | |
1249 | ||
1250 | /* If we couldn't do it that way, there are two other possibilities: First, | |
1251 | if the machine can output an explicit byte and this is a 1 byte constant, | |
1252 | we can use ASM_OUTPUT_BYTE. */ | |
1253 | ||
1254 | #ifdef ASM_OUTPUT_BYTE | |
1255 | if (size == 1 && GET_CODE (x) == CONST_INT) | |
1256 | { | |
1257 | ASM_OUTPUT_BYTE (asm_out_file, INTVAL (x)); | |
1258 | return 1; | |
1259 | } | |
1260 | #endif | |
1261 | ||
1262 | /* Finally, if SIZE is larger than a single word, try to output the constant | |
1263 | one word at a time. */ | |
1264 | ||
1265 | if (size > UNITS_PER_WORD) | |
1266 | { | |
1267 | int i; | |
1268 | enum machine_mode mode | |
1269 | = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0); | |
1270 | rtx word; | |
1271 | ||
1272 | for (i = 0; i < size / UNITS_PER_WORD; i++) | |
1273 | { | |
1274 | word = operand_subword (x, i, 0, mode); | |
1275 | ||
1276 | if (word == 0) | |
1277 | break; | |
1278 | ||
fff9e713 MT |
1279 | if (! assemble_integer (word, UNITS_PER_WORD, 0)) |
1280 | break; | |
79e68feb RS |
1281 | } |
1282 | ||
1283 | if (i == size / UNITS_PER_WORD) | |
1284 | return 1; | |
fff9e713 MT |
1285 | /* If we output at least one word and then could not finish, |
1286 | there is no valid way to continue. */ | |
1287 | if (i > 0) | |
1288 | abort (); | |
79e68feb RS |
1289 | } |
1290 | ||
1291 | if (force) | |
1292 | abort (); | |
1293 | ||
1294 | return 0; | |
1295 | } | |
1296 | \f | |
1297 | /* Assemble the floating-point constant D into an object of size MODE. */ | |
1298 | ||
1299 | void | |
1300 | assemble_real (d, mode) | |
1301 | REAL_VALUE_TYPE d; | |
1302 | enum machine_mode mode; | |
1303 | { | |
1304 | jmp_buf output_constant_handler; | |
1305 | ||
1306 | if (setjmp (output_constant_handler)) | |
1307 | { | |
1308 | error ("floating point trap outputting a constant"); | |
1309 | #ifdef REAL_IS_NOT_DOUBLE | |
1310 | bzero (&d, sizeof d); | |
1311 | d = dconst0; | |
1312 | #else | |
1313 | d = 0; | |
1314 | #endif | |
1315 | } | |
1316 | ||
1317 | set_float_handler (output_constant_handler); | |
1318 | ||
1319 | switch (mode) | |
1320 | { | |
b7526ea5 RS |
1321 | #ifdef ASM_OUTPUT_BYTE_FLOAT |
1322 | case QFmode: | |
1323 | ASM_OUTPUT_BYTE_FLOAT (asm_out_file, d); | |
1324 | break; | |
1325 | #endif | |
1326 | #ifdef ASM_OUTPUT_SHORT_FLOAT | |
1327 | case HFmode: | |
1328 | ASM_OUTPUT_SHORT_FLOAT (asm_out_file, d); | |
1329 | break; | |
1330 | #endif | |
79e68feb RS |
1331 | #ifdef ASM_OUTPUT_FLOAT |
1332 | case SFmode: | |
1333 | ASM_OUTPUT_FLOAT (asm_out_file, d); | |
1334 | break; | |
1335 | #endif | |
1336 | ||
1337 | #ifdef ASM_OUTPUT_DOUBLE | |
1338 | case DFmode: | |
1339 | ASM_OUTPUT_DOUBLE (asm_out_file, d); | |
1340 | break; | |
1341 | #endif | |
1342 | ||
1343 | #ifdef ASM_OUTPUT_LONG_DOUBLE | |
2c7ff63c | 1344 | case XFmode: |
79e68feb RS |
1345 | case TFmode: |
1346 | ASM_OUTPUT_LONG_DOUBLE (asm_out_file, d); | |
1347 | break; | |
1348 | #endif | |
1349 | ||
1350 | default: | |
1351 | abort (); | |
1352 | } | |
1353 | ||
37366632 | 1354 | set_float_handler (NULL_PTR); |
79e68feb RS |
1355 | } |
1356 | \f | |
1357 | /* Here we combine duplicate floating constants to make | |
1358 | CONST_DOUBLE rtx's, and force those out to memory when necessary. */ | |
1359 | ||
1360 | /* Chain of all CONST_DOUBLE rtx's constructed for the current function. | |
1361 | They are chained through the CONST_DOUBLE_CHAIN. | |
1362 | A CONST_DOUBLE rtx has CONST_DOUBLE_MEM != cc0_rtx iff it is on this chain. | |
1363 | In that case, CONST_DOUBLE_MEM is either a MEM, | |
57632c51 RS |
1364 | or const0_rtx if no MEM has been made for this CONST_DOUBLE yet. |
1365 | ||
1366 | (CONST_DOUBLE_MEM is used only for top-level functions. | |
1367 | See force_const_mem for explanation.) */ | |
79e68feb RS |
1368 | |
1369 | static rtx const_double_chain; | |
1370 | ||
1371 | /* Return a CONST_DOUBLE for a value specified as a pair of ints. | |
1372 | For an integer, I0 is the low-order word and I1 is the high-order word. | |
1373 | For a real number, I0 is the word with the low address | |
1374 | and I1 is the word with the high address. */ | |
1375 | ||
1376 | rtx | |
1377 | immed_double_const (i0, i1, mode) | |
37366632 | 1378 | HOST_WIDE_INT i0, i1; |
79e68feb RS |
1379 | enum machine_mode mode; |
1380 | { | |
1381 | register rtx r; | |
1382 | int in_current_obstack; | |
1383 | ||
ab8ab9d0 SC |
1384 | if (GET_MODE_CLASS (mode) == MODE_INT |
1385 | || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT) | |
79e68feb RS |
1386 | { |
1387 | /* We clear out all bits that don't belong in MODE, unless they and our | |
1388 | sign bit are all one. So we get either a reasonable negative value | |
1389 | or a reasonable unsigned value for this mode. */ | |
1390 | int width = GET_MODE_BITSIZE (mode); | |
37366632 RK |
1391 | if (width < HOST_BITS_PER_WIDE_INT |
1392 | && ((i0 & ((HOST_WIDE_INT) (-1) << (width - 1))) | |
1393 | != ((HOST_WIDE_INT) (-1) << (width - 1)))) | |
1394 | i0 &= ((HOST_WIDE_INT) 1 << width) - 1, i1 = 0; | |
1395 | else if (width == HOST_BITS_PER_WIDE_INT | |
79e68feb RS |
1396 | && ! (i1 == ~0 && i0 < 0)) |
1397 | i1 = 0; | |
37366632 | 1398 | else if (width > 2 * HOST_BITS_PER_WIDE_INT) |
79e68feb RS |
1399 | /* We cannot represent this value as a constant. */ |
1400 | abort (); | |
1401 | ||
37366632 | 1402 | /* If MODE fits within HOST_BITS_PER_WIDE_INT, always use a CONST_INT. |
79e68feb RS |
1403 | |
1404 | ??? Strictly speaking, this is wrong if we create a CONST_INT | |
1405 | for a large unsigned constant with the size of MODE being | |
37366632 RK |
1406 | HOST_BITS_PER_WIDE_INT and later try to interpret that constant in a |
1407 | wider mode. In that case we will mis-interpret it as a negative | |
1408 | number. | |
79e68feb RS |
1409 | |
1410 | Unfortunately, the only alternative is to make a CONST_DOUBLE | |
1411 | for any constant in any mode if it is an unsigned constant larger | |
1412 | than the maximum signed integer in an int on the host. However, | |
1413 | doing this will break everyone that always expects to see a CONST_INT | |
1414 | for SImode and smaller. | |
1415 | ||
1416 | We have always been making CONST_INTs in this case, so nothing new | |
1417 | is being broken. */ | |
1418 | ||
37366632 | 1419 | if (width <= HOST_BITS_PER_WIDE_INT) |
79e68feb RS |
1420 | i1 = (i0 < 0) ? ~0 : 0; |
1421 | ||
1422 | /* If this integer fits in one word, return a CONST_INT. */ | |
1423 | if ((i1 == 0 && i0 >= 0) | |
1424 | || (i1 == ~0 && i0 < 0)) | |
37366632 | 1425 | return GEN_INT (i0); |
79e68feb RS |
1426 | |
1427 | /* We use VOIDmode for integers. */ | |
1428 | mode = VOIDmode; | |
1429 | } | |
1430 | ||
1431 | /* Search the chain for an existing CONST_DOUBLE with the right value. | |
1432 | If one is found, return it. */ | |
1433 | ||
1434 | for (r = const_double_chain; r; r = CONST_DOUBLE_CHAIN (r)) | |
1435 | if (CONST_DOUBLE_LOW (r) == i0 && CONST_DOUBLE_HIGH (r) == i1 | |
1436 | && GET_MODE (r) == mode) | |
1437 | return r; | |
1438 | ||
1439 | /* No; make a new one and add it to the chain. | |
1440 | ||
1441 | We may be called by an optimizer which may be discarding any memory | |
1442 | allocated during its processing (such as combine and loop). However, | |
1443 | we will be leaving this constant on the chain, so we cannot tolerate | |
1444 | freed memory. So switch to saveable_obstack for this allocation | |
1445 | and then switch back if we were in current_obstack. */ | |
1446 | ||
2260924f JW |
1447 | push_obstacks_nochange (); |
1448 | rtl_in_saveable_obstack (); | |
79e68feb | 1449 | r = gen_rtx (CONST_DOUBLE, mode, 0, i0, i1); |
2260924f | 1450 | pop_obstacks (); |
79e68feb | 1451 | |
5145eda8 RS |
1452 | /* Don't touch const_double_chain in nested function; |
1453 | see force_const_mem. */ | |
8843f6e2 | 1454 | if (outer_function_chain == 0) |
5145eda8 RS |
1455 | { |
1456 | CONST_DOUBLE_CHAIN (r) = const_double_chain; | |
1457 | const_double_chain = r; | |
1458 | } | |
79e68feb RS |
1459 | |
1460 | /* Store const0_rtx in mem-slot since this CONST_DOUBLE is on the chain. | |
1461 | Actual use of mem-slot is only through force_const_mem. */ | |
1462 | ||
1463 | CONST_DOUBLE_MEM (r) = const0_rtx; | |
1464 | ||
1465 | return r; | |
1466 | } | |
1467 | ||
1468 | /* Return a CONST_DOUBLE for a specified `double' value | |
1469 | and machine mode. */ | |
1470 | ||
1471 | rtx | |
1472 | immed_real_const_1 (d, mode) | |
1473 | REAL_VALUE_TYPE d; | |
1474 | enum machine_mode mode; | |
1475 | { | |
1476 | union real_extract u; | |
1477 | register rtx r; | |
1478 | int in_current_obstack; | |
1479 | ||
1480 | /* Get the desired `double' value as a sequence of ints | |
1481 | since that is how they are stored in a CONST_DOUBLE. */ | |
1482 | ||
1483 | u.d = d; | |
1484 | ||
1485 | /* Detect special cases. */ | |
1486 | ||
f246a305 RS |
1487 | /* Avoid REAL_VALUES_EQUAL here in order to distinguish minus zero. */ |
1488 | if (!bcmp (&dconst0, &d, sizeof d)) | |
79e68feb | 1489 | return CONST0_RTX (mode); |
12194c38 RS |
1490 | /* Check for NaN first, because some ports (specifically the i386) do not |
1491 | emit correct ieee-fp code by default, and thus will generate a core | |
1492 | dump here if we pass a NaN to REAL_VALUES_EQUAL and if REAL_VALUES_EQUAL | |
1493 | does a floating point comparison. */ | |
1494 | else if (! REAL_VALUE_ISNAN (d) && REAL_VALUES_EQUAL (dconst1, d)) | |
79e68feb RS |
1495 | return CONST1_RTX (mode); |
1496 | ||
37366632 | 1497 | if (sizeof u == 2 * sizeof (HOST_WIDE_INT)) |
79e68feb RS |
1498 | return immed_double_const (u.i[0], u.i[1], mode); |
1499 | ||
1500 | /* The rest of this function handles the case where | |
1501 | a float value requires more than 2 ints of space. | |
1502 | It will be deleted as dead code on machines that don't need it. */ | |
1503 | ||
1504 | /* Search the chain for an existing CONST_DOUBLE with the right value. | |
1505 | If one is found, return it. */ | |
1506 | ||
1507 | for (r = const_double_chain; r; r = CONST_DOUBLE_CHAIN (r)) | |
1508 | if (! bcmp (&CONST_DOUBLE_LOW (r), &u, sizeof u) | |
1509 | && GET_MODE (r) == mode) | |
1510 | return r; | |
1511 | ||
1512 | /* No; make a new one and add it to the chain. | |
1513 | ||
1514 | We may be called by an optimizer which may be discarding any memory | |
1515 | allocated during its processing (such as combine and loop). However, | |
1516 | we will be leaving this constant on the chain, so we cannot tolerate | |
1517 | freed memory. So switch to saveable_obstack for this allocation | |
1518 | and then switch back if we were in current_obstack. */ | |
1519 | ||
2260924f JW |
1520 | push_obstacks_nochange (); |
1521 | rtl_in_saveable_obstack (); | |
79e68feb RS |
1522 | r = rtx_alloc (CONST_DOUBLE); |
1523 | PUT_MODE (r, mode); | |
1524 | bcopy (&u, &CONST_DOUBLE_LOW (r), sizeof u); | |
2260924f | 1525 | pop_obstacks (); |
79e68feb | 1526 | |
5145eda8 RS |
1527 | /* Don't touch const_double_chain in nested function; |
1528 | see force_const_mem. */ | |
8843f6e2 | 1529 | if (outer_function_chain == 0) |
5145eda8 RS |
1530 | { |
1531 | CONST_DOUBLE_CHAIN (r) = const_double_chain; | |
1532 | const_double_chain = r; | |
1533 | } | |
79e68feb RS |
1534 | |
1535 | /* Store const0_rtx in CONST_DOUBLE_MEM since this CONST_DOUBLE is on the | |
1536 | chain, but has not been allocated memory. Actual use of CONST_DOUBLE_MEM | |
1537 | is only through force_const_mem. */ | |
1538 | ||
1539 | CONST_DOUBLE_MEM (r) = const0_rtx; | |
1540 | ||
1541 | return r; | |
1542 | } | |
1543 | ||
1544 | /* Return a CONST_DOUBLE rtx for a value specified by EXP, | |
1545 | which must be a REAL_CST tree node. */ | |
1546 | ||
1547 | rtx | |
1548 | immed_real_const (exp) | |
1549 | tree exp; | |
1550 | { | |
1551 | return immed_real_const_1 (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp))); | |
1552 | } | |
1553 | ||
1554 | /* At the end of a function, forget the memory-constants | |
1555 | previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain. | |
1556 | Also clear out real_constant_chain and clear out all the chain-pointers. */ | |
1557 | ||
1558 | void | |
1559 | clear_const_double_mem () | |
1560 | { | |
1561 | register rtx r, next; | |
1562 | ||
57632c51 RS |
1563 | /* Don't touch CONST_DOUBLE_MEM for nested functions. |
1564 | See force_const_mem for explanation. */ | |
1565 | if (outer_function_chain != 0) | |
1566 | return; | |
1567 | ||
79e68feb RS |
1568 | for (r = const_double_chain; r; r = next) |
1569 | { | |
1570 | next = CONST_DOUBLE_CHAIN (r); | |
1571 | CONST_DOUBLE_CHAIN (r) = 0; | |
1572 | CONST_DOUBLE_MEM (r) = cc0_rtx; | |
1573 | } | |
1574 | const_double_chain = 0; | |
1575 | } | |
1576 | \f | |
1577 | /* Given an expression EXP with a constant value, | |
1578 | reduce it to the sum of an assembler symbol and an integer. | |
1579 | Store them both in the structure *VALUE. | |
1580 | Abort if EXP does not reduce. */ | |
1581 | ||
1582 | struct addr_const | |
1583 | { | |
1584 | rtx base; | |
fb351073 | 1585 | HOST_WIDE_INT offset; |
79e68feb RS |
1586 | }; |
1587 | ||
1588 | static void | |
1589 | decode_addr_const (exp, value) | |
1590 | tree exp; | |
1591 | struct addr_const *value; | |
1592 | { | |
1593 | register tree target = TREE_OPERAND (exp, 0); | |
1594 | register int offset = 0; | |
1595 | register rtx x; | |
1596 | ||
1597 | while (1) | |
1598 | { | |
1599 | if (TREE_CODE (target) == COMPONENT_REF | |
1600 | && (TREE_CODE (DECL_FIELD_BITPOS (TREE_OPERAND (target, 1))) | |
1601 | == INTEGER_CST)) | |
1602 | { | |
1603 | offset += TREE_INT_CST_LOW (DECL_FIELD_BITPOS (TREE_OPERAND (target, 1))) / BITS_PER_UNIT; | |
1604 | target = TREE_OPERAND (target, 0); | |
1605 | } | |
1606 | else if (TREE_CODE (target) == ARRAY_REF) | |
1607 | { | |
1608 | if (TREE_CODE (TREE_OPERAND (target, 1)) != INTEGER_CST | |
1609 | || TREE_CODE (TYPE_SIZE (TREE_TYPE (target))) != INTEGER_CST) | |
1610 | abort (); | |
1611 | offset += ((TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (target))) | |
1612 | * TREE_INT_CST_LOW (TREE_OPERAND (target, 1))) | |
1613 | / BITS_PER_UNIT); | |
1614 | target = TREE_OPERAND (target, 0); | |
1615 | } | |
1616 | else | |
1617 | break; | |
1618 | } | |
1619 | ||
1620 | switch (TREE_CODE (target)) | |
1621 | { | |
1622 | case VAR_DECL: | |
1623 | case FUNCTION_DECL: | |
1624 | x = DECL_RTL (target); | |
1625 | break; | |
1626 | ||
1627 | case LABEL_DECL: | |
1628 | x = gen_rtx (MEM, FUNCTION_MODE, | |
1629 | gen_rtx (LABEL_REF, VOIDmode, | |
1630 | label_rtx (TREE_OPERAND (exp, 0)))); | |
1631 | break; | |
1632 | ||
1633 | case REAL_CST: | |
1634 | case STRING_CST: | |
1635 | case COMPLEX_CST: | |
1636 | case CONSTRUCTOR: | |
1637 | x = TREE_CST_RTL (target); | |
1638 | break; | |
1639 | ||
1640 | default: | |
1641 | abort (); | |
1642 | } | |
1643 | ||
1644 | if (GET_CODE (x) != MEM) | |
1645 | abort (); | |
1646 | x = XEXP (x, 0); | |
1647 | ||
1648 | value->base = x; | |
1649 | value->offset = offset; | |
1650 | } | |
1651 | \f | |
1652 | /* Uniquize all constants that appear in memory. | |
1653 | Each constant in memory thus far output is recorded | |
1654 | in `const_hash_table' with a `struct constant_descriptor' | |
1655 | that contains a polish representation of the value of | |
1656 | the constant. | |
1657 | ||
1658 | We cannot store the trees in the hash table | |
1659 | because the trees may be temporary. */ | |
1660 | ||
1661 | struct constant_descriptor | |
1662 | { | |
1663 | struct constant_descriptor *next; | |
1664 | char *label; | |
1665 | char contents[1]; | |
1666 | }; | |
1667 | ||
1668 | #define HASHBITS 30 | |
1669 | #define MAX_HASH_TABLE 1009 | |
1670 | static struct constant_descriptor *const_hash_table[MAX_HASH_TABLE]; | |
1671 | ||
1672 | /* Compute a hash code for a constant expression. */ | |
1673 | ||
1674 | int | |
1675 | const_hash (exp) | |
1676 | tree exp; | |
1677 | { | |
1678 | register char *p; | |
1679 | register int len, hi, i; | |
1680 | register enum tree_code code = TREE_CODE (exp); | |
1681 | ||
1682 | if (code == INTEGER_CST) | |
1683 | { | |
1684 | p = (char *) &TREE_INT_CST_LOW (exp); | |
1685 | len = 2 * sizeof TREE_INT_CST_LOW (exp); | |
1686 | } | |
1687 | else if (code == REAL_CST) | |
1688 | { | |
1689 | p = (char *) &TREE_REAL_CST (exp); | |
1690 | len = sizeof TREE_REAL_CST (exp); | |
1691 | } | |
1692 | else if (code == STRING_CST) | |
1693 | p = TREE_STRING_POINTER (exp), len = TREE_STRING_LENGTH (exp); | |
1694 | else if (code == COMPLEX_CST) | |
1695 | return const_hash (TREE_REALPART (exp)) * 5 | |
1696 | + const_hash (TREE_IMAGPART (exp)); | |
1697 | else if (code == CONSTRUCTOR) | |
1698 | { | |
1699 | register tree link; | |
1700 | ||
1701 | /* For record type, include the type in the hashing. | |
1702 | We do not do so for array types | |
1703 | because (1) the sizes of the elements are sufficient | |
eb528802 RS |
1704 | and (2) distinct array types can have the same constructor. |
1705 | Instead, we include the array size because the constructor could | |
1706 | be shorter. */ | |
79e68feb | 1707 | if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE) |
fb351073 RK |
1708 | hi = ((HOST_WIDE_INT) TREE_TYPE (exp) & ((1 << HASHBITS) - 1)) |
1709 | % MAX_HASH_TABLE; | |
79e68feb | 1710 | else |
eb528802 RS |
1711 | hi = ((5 + int_size_in_bytes (TREE_TYPE (exp))) |
1712 | & ((1 << HASHBITS) - 1)) % MAX_HASH_TABLE; | |
79e68feb RS |
1713 | |
1714 | for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link)) | |
77fa0940 RK |
1715 | if (TREE_VALUE (link)) |
1716 | hi = (hi * 603 + const_hash (TREE_VALUE (link))) % MAX_HASH_TABLE; | |
79e68feb RS |
1717 | |
1718 | return hi; | |
1719 | } | |
1720 | else if (code == ADDR_EXPR) | |
1721 | { | |
1722 | struct addr_const value; | |
1723 | decode_addr_const (exp, &value); | |
1724 | if (GET_CODE (value.base) == SYMBOL_REF) | |
1725 | { | |
1726 | /* Don't hash the address of the SYMBOL_REF; | |
1727 | only use the offset and the symbol name. */ | |
1728 | hi = value.offset; | |
1729 | p = XSTR (value.base, 0); | |
1730 | for (i = 0; p[i] != 0; i++) | |
1731 | hi = ((hi * 613) + (unsigned)(p[i])); | |
1732 | } | |
1733 | else if (GET_CODE (value.base) == LABEL_REF) | |
1734 | hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13; | |
1735 | ||
1736 | hi &= (1 << HASHBITS) - 1; | |
1737 | hi %= MAX_HASH_TABLE; | |
1738 | return hi; | |
1739 | } | |
1740 | else if (code == PLUS_EXPR || code == MINUS_EXPR) | |
1741 | return const_hash (TREE_OPERAND (exp, 0)) * 9 | |
1742 | + const_hash (TREE_OPERAND (exp, 1)); | |
1743 | else if (code == NOP_EXPR || code == CONVERT_EXPR) | |
1744 | return const_hash (TREE_OPERAND (exp, 0)) * 7 + 2; | |
1745 | ||
1746 | /* Compute hashing function */ | |
1747 | hi = len; | |
1748 | for (i = 0; i < len; i++) | |
1749 | hi = ((hi * 613) + (unsigned)(p[i])); | |
1750 | ||
1751 | hi &= (1 << HASHBITS) - 1; | |
1752 | hi %= MAX_HASH_TABLE; | |
1753 | return hi; | |
1754 | } | |
1755 | \f | |
1756 | /* Compare a constant expression EXP with a constant-descriptor DESC. | |
1757 | Return 1 if DESC describes a constant with the same value as EXP. */ | |
1758 | ||
1759 | static int | |
1760 | compare_constant (exp, desc) | |
1761 | tree exp; | |
1762 | struct constant_descriptor *desc; | |
1763 | { | |
1764 | return 0 != compare_constant_1 (exp, desc->contents); | |
1765 | } | |
1766 | ||
1767 | /* Compare constant expression EXP with a substring P of a constant descriptor. | |
1768 | If they match, return a pointer to the end of the substring matched. | |
1769 | If they do not match, return 0. | |
1770 | ||
1771 | Since descriptors are written in polish prefix notation, | |
1772 | this function can be used recursively to test one operand of EXP | |
1773 | against a subdescriptor, and if it succeeds it returns the | |
1774 | address of the subdescriptor for the next operand. */ | |
1775 | ||
1776 | static char * | |
1777 | compare_constant_1 (exp, p) | |
1778 | tree exp; | |
1779 | char *p; | |
1780 | { | |
1781 | register char *strp; | |
1782 | register int len; | |
1783 | register enum tree_code code = TREE_CODE (exp); | |
1784 | ||
1785 | if (code != (enum tree_code) *p++) | |
1786 | return 0; | |
1787 | ||
1788 | if (code == INTEGER_CST) | |
1789 | { | |
1790 | /* Integer constants are the same only if the same width of type. */ | |
1791 | if (*p++ != TYPE_PRECISION (TREE_TYPE (exp))) | |
1792 | return 0; | |
1793 | strp = (char *) &TREE_INT_CST_LOW (exp); | |
1794 | len = 2 * sizeof TREE_INT_CST_LOW (exp); | |
1795 | } | |
1796 | else if (code == REAL_CST) | |
1797 | { | |
1798 | /* Real constants are the same only if the same width of type. */ | |
1799 | if (*p++ != TYPE_PRECISION (TREE_TYPE (exp))) | |
1800 | return 0; | |
1801 | strp = (char *) &TREE_REAL_CST (exp); | |
1802 | len = sizeof TREE_REAL_CST (exp); | |
1803 | } | |
1804 | else if (code == STRING_CST) | |
1805 | { | |
1806 | if (flag_writable_strings) | |
1807 | return 0; | |
1808 | strp = TREE_STRING_POINTER (exp); | |
1809 | len = TREE_STRING_LENGTH (exp); | |
1810 | if (bcmp (&TREE_STRING_LENGTH (exp), p, | |
1811 | sizeof TREE_STRING_LENGTH (exp))) | |
1812 | return 0; | |
1813 | p += sizeof TREE_STRING_LENGTH (exp); | |
1814 | } | |
1815 | else if (code == COMPLEX_CST) | |
1816 | { | |
1817 | p = compare_constant_1 (TREE_REALPART (exp), p); | |
1818 | if (p == 0) return 0; | |
1819 | p = compare_constant_1 (TREE_IMAGPART (exp), p); | |
1820 | return p; | |
1821 | } | |
1822 | else if (code == CONSTRUCTOR) | |
1823 | { | |
1824 | register tree link; | |
1825 | int length = list_length (CONSTRUCTOR_ELTS (exp)); | |
1826 | tree type; | |
1827 | ||
1828 | if (bcmp (&length, p, sizeof length)) | |
1829 | return 0; | |
1830 | p += sizeof length; | |
1831 | ||
1832 | /* For record constructors, insist that the types match. | |
1833 | For arrays, just verify both constructors are for arrays. */ | |
1834 | if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE) | |
1835 | type = TREE_TYPE (exp); | |
1836 | else | |
1837 | type = 0; | |
1838 | if (bcmp (&type, p, sizeof type)) | |
1839 | return 0; | |
1840 | p += sizeof type; | |
1841 | ||
eb528802 RS |
1842 | /* For arrays, insist that the size in bytes match. */ |
1843 | if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE) | |
1844 | { | |
1845 | int size = int_size_in_bytes (TREE_TYPE (exp)); | |
1846 | if (bcmp (&size, p, sizeof size)) | |
1847 | return 0; | |
1848 | p += sizeof size; | |
1849 | } | |
1850 | ||
79e68feb | 1851 | for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link)) |
77fa0940 RK |
1852 | { |
1853 | if (TREE_VALUE (link)) | |
1854 | { | |
1855 | if ((p = compare_constant_1 (TREE_VALUE (link), p)) == 0) | |
1856 | return 0; | |
1857 | } | |
1858 | else | |
1859 | { | |
1860 | tree zero = 0; | |
1861 | ||
1862 | if (bcmp (&zero, p, sizeof zero)) | |
1863 | return 0; | |
1864 | p += sizeof zero; | |
1865 | } | |
1866 | } | |
1867 | ||
79e68feb RS |
1868 | return p; |
1869 | } | |
1870 | else if (code == ADDR_EXPR) | |
1871 | { | |
1872 | struct addr_const value; | |
1873 | decode_addr_const (exp, &value); | |
1874 | strp = (char *) &value.offset; | |
1875 | len = sizeof value.offset; | |
1876 | /* Compare the offset. */ | |
1877 | while (--len >= 0) | |
1878 | if (*p++ != *strp++) | |
1879 | return 0; | |
1880 | /* Compare symbol name. */ | |
1881 | strp = XSTR (value.base, 0); | |
1882 | len = strlen (strp) + 1; | |
1883 | } | |
1884 | else if (code == PLUS_EXPR || code == MINUS_EXPR) | |
1885 | { | |
1886 | p = compare_constant_1 (TREE_OPERAND (exp, 0), p); | |
1887 | if (p == 0) return 0; | |
1888 | p = compare_constant_1 (TREE_OPERAND (exp, 1), p); | |
1889 | return p; | |
1890 | } | |
1891 | else if (code == NOP_EXPR || code == CONVERT_EXPR) | |
1892 | { | |
1893 | p = compare_constant_1 (TREE_OPERAND (exp, 0), p); | |
1894 | return p; | |
1895 | } | |
1896 | ||
1897 | /* Compare constant contents. */ | |
1898 | while (--len >= 0) | |
1899 | if (*p++ != *strp++) | |
1900 | return 0; | |
1901 | ||
1902 | return p; | |
1903 | } | |
1904 | \f | |
1905 | /* Construct a constant descriptor for the expression EXP. | |
1906 | It is up to the caller to enter the descriptor in the hash table. */ | |
1907 | ||
1908 | static struct constant_descriptor * | |
1909 | record_constant (exp) | |
1910 | tree exp; | |
1911 | { | |
387e854a RK |
1912 | struct constant_descriptor *next = 0; |
1913 | char *label = 0; | |
79e68feb | 1914 | |
387e854a RK |
1915 | /* Make a struct constant_descriptor. The first two pointers will |
1916 | be filled in later. Here we just leave space for them. */ | |
1917 | ||
1918 | obstack_grow (&permanent_obstack, (char *) &next, sizeof next); | |
1919 | obstack_grow (&permanent_obstack, (char *) &label, sizeof label); | |
79e68feb RS |
1920 | record_constant_1 (exp); |
1921 | return (struct constant_descriptor *) obstack_finish (&permanent_obstack); | |
1922 | } | |
1923 | ||
1924 | /* Add a description of constant expression EXP | |
1925 | to the object growing in `permanent_obstack'. | |
1926 | No need to return its address; the caller will get that | |
1927 | from the obstack when the object is complete. */ | |
1928 | ||
1929 | static void | |
1930 | record_constant_1 (exp) | |
1931 | tree exp; | |
1932 | { | |
1933 | register char *strp; | |
1934 | register int len; | |
1935 | register enum tree_code code = TREE_CODE (exp); | |
1936 | ||
1937 | obstack_1grow (&permanent_obstack, (unsigned int) code); | |
1938 | ||
1939 | if (code == INTEGER_CST) | |
1940 | { | |
1941 | obstack_1grow (&permanent_obstack, TYPE_PRECISION (TREE_TYPE (exp))); | |
1942 | strp = (char *) &TREE_INT_CST_LOW (exp); | |
1943 | len = 2 * sizeof TREE_INT_CST_LOW (exp); | |
1944 | } | |
1945 | else if (code == REAL_CST) | |
1946 | { | |
1947 | obstack_1grow (&permanent_obstack, TYPE_PRECISION (TREE_TYPE (exp))); | |
1948 | strp = (char *) &TREE_REAL_CST (exp); | |
1949 | len = sizeof TREE_REAL_CST (exp); | |
1950 | } | |
1951 | else if (code == STRING_CST) | |
1952 | { | |
1953 | if (flag_writable_strings) | |
1954 | return; | |
1955 | strp = TREE_STRING_POINTER (exp); | |
1956 | len = TREE_STRING_LENGTH (exp); | |
1957 | obstack_grow (&permanent_obstack, (char *) &TREE_STRING_LENGTH (exp), | |
1958 | sizeof TREE_STRING_LENGTH (exp)); | |
1959 | } | |
1960 | else if (code == COMPLEX_CST) | |
1961 | { | |
1962 | record_constant_1 (TREE_REALPART (exp)); | |
1963 | record_constant_1 (TREE_IMAGPART (exp)); | |
1964 | return; | |
1965 | } | |
1966 | else if (code == CONSTRUCTOR) | |
1967 | { | |
1968 | register tree link; | |
1969 | int length = list_length (CONSTRUCTOR_ELTS (exp)); | |
1970 | tree type; | |
1971 | ||
1972 | obstack_grow (&permanent_obstack, (char *) &length, sizeof length); | |
1973 | ||
1974 | /* For record constructors, insist that the types match. | |
1975 | For arrays, just verify both constructors are for arrays. */ | |
1976 | if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE) | |
1977 | type = TREE_TYPE (exp); | |
1978 | else | |
1979 | type = 0; | |
1980 | obstack_grow (&permanent_obstack, (char *) &type, sizeof type); | |
1981 | ||
eb528802 RS |
1982 | /* For arrays, insist that the size in bytes match. */ |
1983 | if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE) | |
1984 | { | |
1985 | int size = int_size_in_bytes (TREE_TYPE (exp)); | |
1986 | obstack_grow (&permanent_obstack, (char *) &size, sizeof size); | |
1987 | } | |
1988 | ||
79e68feb | 1989 | for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link)) |
77fa0940 RK |
1990 | { |
1991 | if (TREE_VALUE (link)) | |
1992 | record_constant_1 (TREE_VALUE (link)); | |
1993 | else | |
1994 | { | |
1995 | tree zero = 0; | |
1996 | ||
1997 | obstack_grow (&permanent_obstack, (char *) &zero, sizeof zero); | |
1998 | } | |
1999 | } | |
2000 | ||
79e68feb RS |
2001 | return; |
2002 | } | |
2003 | else if (code == ADDR_EXPR) | |
2004 | { | |
2005 | struct addr_const value; | |
2006 | decode_addr_const (exp, &value); | |
2007 | /* Record the offset. */ | |
2008 | obstack_grow (&permanent_obstack, | |
2009 | (char *) &value.offset, sizeof value.offset); | |
2010 | /* Record the symbol name. */ | |
2011 | obstack_grow (&permanent_obstack, XSTR (value.base, 0), | |
2012 | strlen (XSTR (value.base, 0)) + 1); | |
2013 | return; | |
2014 | } | |
2015 | else if (code == PLUS_EXPR || code == MINUS_EXPR) | |
2016 | { | |
2017 | record_constant_1 (TREE_OPERAND (exp, 0)); | |
2018 | record_constant_1 (TREE_OPERAND (exp, 1)); | |
2019 | return; | |
2020 | } | |
2021 | else if (code == NOP_EXPR || code == CONVERT_EXPR) | |
2022 | { | |
2023 | record_constant_1 (TREE_OPERAND (exp, 0)); | |
2024 | return; | |
2025 | } | |
2026 | ||
2027 | /* Record constant contents. */ | |
2028 | obstack_grow (&permanent_obstack, strp, len); | |
2029 | } | |
2030 | \f | |
ff8f4401 RS |
2031 | /* Record a list of constant expressions that were passed to |
2032 | output_constant_def but that could not be output right away. */ | |
2033 | ||
2034 | struct deferred_constant | |
2035 | { | |
2036 | struct deferred_constant *next; | |
2037 | tree exp; | |
2038 | int reloc; | |
2039 | int labelno; | |
2040 | }; | |
2041 | ||
2042 | static struct deferred_constant *deferred_constants; | |
2043 | ||
2044 | /* Nonzero means defer output of addressed subconstants | |
2045 | (i.e., those for which output_constant_def is called.) */ | |
2046 | static int defer_addressed_constants_flag; | |
2047 | ||
2048 | /* Start deferring output of subconstants. */ | |
2049 | ||
2050 | void | |
2051 | defer_addressed_constants () | |
2052 | { | |
2053 | defer_addressed_constants_flag++; | |
2054 | } | |
2055 | ||
2056 | /* Stop deferring output of subconstants, | |
2057 | and output now all those that have been deferred. */ | |
2058 | ||
2059 | void | |
2060 | output_deferred_addressed_constants () | |
2061 | { | |
2062 | struct deferred_constant *p, *next; | |
2063 | ||
2064 | defer_addressed_constants_flag--; | |
2065 | ||
2066 | if (defer_addressed_constants_flag > 0) | |
2067 | return; | |
2068 | ||
2069 | for (p = deferred_constants; p; p = next) | |
2070 | { | |
2071 | output_constant_def_contents (p->exp, p->reloc, p->labelno); | |
2072 | next = p->next; | |
2073 | free (p); | |
2074 | } | |
2075 | ||
2076 | deferred_constants = 0; | |
2077 | } | |
2078 | \f | |
79e68feb RS |
2079 | /* Return an rtx representing a reference to constant data in memory |
2080 | for the constant expression EXP. | |
ff8f4401 | 2081 | |
79e68feb RS |
2082 | If assembler code for such a constant has already been output, |
2083 | return an rtx to refer to it. | |
ff8f4401 RS |
2084 | Otherwise, output such a constant in memory (or defer it for later) |
2085 | and generate an rtx for it. | |
2086 | ||
2087 | The TREE_CST_RTL of EXP is set up to point to that rtx. | |
79e68feb RS |
2088 | The const_hash_table records which constants already have label strings. */ |
2089 | ||
2090 | rtx | |
2091 | output_constant_def (exp) | |
2092 | tree exp; | |
2093 | { | |
ff8f4401 | 2094 | register int hash; |
79e68feb RS |
2095 | register struct constant_descriptor *desc; |
2096 | char label[256]; | |
2097 | char *found = 0; | |
2098 | int reloc; | |
2099 | register rtx def; | |
2100 | ||
2101 | if (TREE_CODE (exp) == INTEGER_CST) | |
2102 | abort (); /* No TREE_CST_RTL slot in these. */ | |
2103 | ||
2104 | if (TREE_CST_RTL (exp)) | |
2105 | return TREE_CST_RTL (exp); | |
2106 | ||
2107 | /* Make sure any other constants whose addresses appear in EXP | |
2108 | are assigned label numbers. */ | |
2109 | ||
2110 | reloc = output_addressed_constants (exp); | |
2111 | ||
2112 | /* Compute hash code of EXP. Search the descriptors for that hash code | |
2113 | to see if any of them describes EXP. If yes, the descriptor records | |
2114 | the label number already assigned. */ | |
2115 | ||
2116 | hash = const_hash (exp) % MAX_HASH_TABLE; | |
2117 | ||
2118 | for (desc = const_hash_table[hash]; desc; desc = desc->next) | |
2119 | if (compare_constant (exp, desc)) | |
2120 | { | |
2121 | found = desc->label; | |
2122 | break; | |
2123 | } | |
2124 | ||
2125 | if (found == 0) | |
2126 | { | |
2127 | /* No constant equal to EXP is known to have been output. | |
2128 | Make a constant descriptor to enter EXP in the hash table. | |
2129 | Assign the label number and record it in the descriptor for | |
2130 | future calls to this function to find. */ | |
2131 | ||
2132 | /* Create a string containing the label name, in LABEL. */ | |
2133 | ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno); | |
2134 | ||
2135 | desc = record_constant (exp); | |
2136 | desc->next = const_hash_table[hash]; | |
2137 | desc->label | |
2138 | = (char *) obstack_copy0 (&permanent_obstack, label, strlen (label)); | |
2139 | const_hash_table[hash] = desc; | |
2140 | } | |
2141 | ||
2142 | /* We have a symbol name; construct the SYMBOL_REF and the MEM. */ | |
2143 | ||
2144 | push_obstacks_nochange (); | |
2145 | if (TREE_PERMANENT (exp)) | |
2146 | end_temporary_allocation (); | |
2147 | ||
2148 | def = gen_rtx (SYMBOL_REF, Pmode, desc->label); | |
2149 | ||
2150 | TREE_CST_RTL (exp) | |
2151 | = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), def); | |
2152 | RTX_UNCHANGING_P (TREE_CST_RTL (exp)) = 1; | |
dd43f13d RS |
2153 | if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE |
2154 | || TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE) | |
2155 | MEM_IN_STRUCT_P (TREE_CST_RTL (exp)) = 1; | |
79e68feb RS |
2156 | |
2157 | pop_obstacks (); | |
2158 | ||
2159 | /* Optionally set flags or add text to the name to record information | |
2160 | such as that it is a function name. If the name is changed, the macro | |
2161 | ASM_OUTPUT_LABELREF will have to know how to strip this information. | |
2162 | And if it finds a * at the beginning after doing so, it must handle | |
2163 | that too. */ | |
2164 | #ifdef ENCODE_SECTION_INFO | |
2165 | ENCODE_SECTION_INFO (exp); | |
2166 | #endif | |
2167 | ||
ff8f4401 RS |
2168 | /* If this is the first time we've seen this particular constant, |
2169 | output it (or defer its output for later). */ | |
79e68feb RS |
2170 | if (found == 0) |
2171 | { | |
ff8f4401 RS |
2172 | if (defer_addressed_constants_flag) |
2173 | { | |
2174 | struct deferred_constant *p; | |
2175 | p = (struct deferred_constant *) xmalloc (sizeof (struct deferred_constant)); | |
2176 | ||
2177 | /* We really should copy trees in depth here, | |
2178 | but since this case is the only one that should happen now, | |
2179 | let's do it later. */ | |
2180 | if (TREE_CODE (exp) != STRING_CST) | |
2181 | abort (); | |
2182 | ||
2183 | push_obstacks_nochange (); | |
2184 | suspend_momentary (); | |
2185 | p->exp = copy_node (exp); | |
2186 | pop_obstacks (); | |
2187 | p->reloc = reloc; | |
2188 | p->labelno = const_labelno++; | |
2189 | p->next = deferred_constants; | |
2190 | deferred_constants = p; | |
2191 | } | |
2192 | else | |
2193 | output_constant_def_contents (exp, reloc, const_labelno++); | |
2194 | } | |
2195 | ||
2196 | return TREE_CST_RTL (exp); | |
2197 | } | |
2198 | ||
2199 | /* Now output assembler code to define the label for EXP, | |
2200 | and follow it with the data of EXP. */ | |
79e68feb | 2201 | |
ff8f4401 RS |
2202 | static void |
2203 | output_constant_def_contents (exp, reloc, labelno) | |
2204 | tree exp; | |
2205 | int reloc; | |
2206 | int labelno; | |
2207 | { | |
2208 | int align; | |
2209 | ||
2210 | /* First switch to text section, except for writable strings. */ | |
79e68feb | 2211 | #ifdef SELECT_SECTION |
ff8f4401 | 2212 | SELECT_SECTION (exp, reloc); |
79e68feb | 2213 | #else |
ff8f4401 RS |
2214 | if (((TREE_CODE (exp) == STRING_CST) && flag_writable_strings) |
2215 | || (flag_pic && reloc)) | |
2216 | data_section (); | |
2217 | else | |
2218 | readonly_data_section (); | |
79e68feb RS |
2219 | #endif |
2220 | ||
ff8f4401 RS |
2221 | /* Align the location counter as required by EXP's data type. */ |
2222 | align = TYPE_ALIGN (TREE_TYPE (exp)); | |
79e68feb | 2223 | #ifdef CONSTANT_ALIGNMENT |
ff8f4401 | 2224 | align = CONSTANT_ALIGNMENT (exp, align); |
79e68feb RS |
2225 | #endif |
2226 | ||
ff8f4401 RS |
2227 | if (align > BITS_PER_UNIT) |
2228 | ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT)); | |
79e68feb | 2229 | |
ff8f4401 RS |
2230 | /* Output the label itself. */ |
2231 | ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LC", labelno); | |
79e68feb | 2232 | |
ff8f4401 RS |
2233 | /* Output the value of EXP. */ |
2234 | output_constant (exp, | |
2235 | (TREE_CODE (exp) == STRING_CST | |
2236 | ? TREE_STRING_LENGTH (exp) | |
2237 | : int_size_in_bytes (TREE_TYPE (exp)))); | |
79e68feb | 2238 | |
79e68feb RS |
2239 | } |
2240 | \f | |
2241 | /* Similar hash facility for making memory-constants | |
2242 | from constant rtl-expressions. It is used on RISC machines | |
2243 | where immediate integer arguments and constant addresses are restricted | |
2244 | so that such constants must be stored in memory. | |
2245 | ||
2246 | This pool of constants is reinitialized for each function | |
2247 | so each function gets its own constants-pool that comes right before it. | |
2248 | ||
2249 | All structures allocated here are discarded when functions are saved for | |
2250 | inlining, so they do not need to be allocated permanently. */ | |
2251 | ||
2252 | #define MAX_RTX_HASH_TABLE 61 | |
57632c51 | 2253 | static struct constant_descriptor **const_rtx_hash_table; |
79e68feb RS |
2254 | |
2255 | /* Structure to represent sufficient information about a constant so that | |
2256 | it can be output when the constant pool is output, so that function | |
2257 | integration can be done, and to simplify handling on machines that reference | |
2258 | constant pool as base+displacement. */ | |
2259 | ||
2260 | struct pool_constant | |
2261 | { | |
2262 | struct constant_descriptor *desc; | |
2263 | struct pool_constant *next; | |
2264 | enum machine_mode mode; | |
2265 | rtx constant; | |
2266 | int labelno; | |
2267 | int align; | |
2268 | int offset; | |
2269 | }; | |
2270 | ||
2271 | /* Pointers to first and last constant in pool. */ | |
2272 | ||
2273 | static struct pool_constant *first_pool, *last_pool; | |
2274 | ||
2275 | /* Current offset in constant pool (does not include any machine-specific | |
2276 | header. */ | |
2277 | ||
2278 | static int pool_offset; | |
2279 | ||
2280 | /* Structure used to maintain hash table mapping symbols used to their | |
2281 | corresponding constants. */ | |
2282 | ||
2283 | struct pool_sym | |
2284 | { | |
2285 | char *label; | |
2286 | struct pool_constant *pool; | |
2287 | struct pool_sym *next; | |
2288 | }; | |
2289 | ||
57632c51 | 2290 | static struct pool_sym **const_rtx_sym_hash_table; |
79e68feb RS |
2291 | |
2292 | /* Hash code for a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true. | |
2293 | The argument is XSTR (... , 0) */ | |
2294 | ||
2295 | #define SYMHASH(LABEL) \ | |
fb351073 | 2296 | ((((HOST_WIDE_INT) (LABEL)) & ((1 << HASHBITS) - 1)) % MAX_RTX_HASH_TABLE) |
79e68feb RS |
2297 | \f |
2298 | /* Initialize constant pool hashing for next function. */ | |
2299 | ||
2300 | void | |
2301 | init_const_rtx_hash_table () | |
2302 | { | |
57632c51 RS |
2303 | const_rtx_hash_table |
2304 | = ((struct constant_descriptor **) | |
2305 | oballoc (MAX_RTX_HASH_TABLE * sizeof (struct constant_descriptor *))); | |
2306 | const_rtx_sym_hash_table | |
2307 | = ((struct pool_sym **) | |
2308 | oballoc (MAX_RTX_HASH_TABLE * sizeof (struct pool_sym *))); | |
2309 | bzero (const_rtx_hash_table, | |
2310 | MAX_RTX_HASH_TABLE * sizeof (struct constant_descriptor *)); | |
2311 | bzero (const_rtx_sym_hash_table, | |
2312 | MAX_RTX_HASH_TABLE * sizeof (struct pool_sym *)); | |
79e68feb RS |
2313 | |
2314 | first_pool = last_pool = 0; | |
2315 | pool_offset = 0; | |
2316 | } | |
2317 | ||
57632c51 RS |
2318 | /* Save and restore it for a nested function. */ |
2319 | ||
2320 | void | |
2321 | save_varasm_status (p) | |
2322 | struct function *p; | |
2323 | { | |
2324 | p->const_rtx_hash_table = const_rtx_hash_table; | |
2325 | p->const_rtx_sym_hash_table = const_rtx_sym_hash_table; | |
2326 | p->first_pool = first_pool; | |
2327 | p->last_pool = last_pool; | |
2328 | p->pool_offset = pool_offset; | |
2329 | } | |
2330 | ||
2331 | void | |
2332 | restore_varasm_status (p) | |
2333 | struct function *p; | |
2334 | { | |
2335 | const_rtx_hash_table = p->const_rtx_hash_table; | |
2336 | const_rtx_sym_hash_table = p->const_rtx_sym_hash_table; | |
2337 | first_pool = p->first_pool; | |
2338 | last_pool = p->last_pool; | |
2339 | pool_offset = p->pool_offset; | |
2340 | } | |
2341 | \f | |
79e68feb RS |
2342 | enum kind { RTX_DOUBLE, RTX_INT }; |
2343 | ||
2344 | struct rtx_const | |
2345 | { | |
2346 | #ifdef ONLY_INT_FIELDS | |
2347 | unsigned int kind : 16; | |
2348 | unsigned int mode : 16; | |
2349 | #else | |
2350 | enum kind kind : 16; | |
2351 | enum machine_mode mode : 16; | |
2352 | #endif | |
2353 | union { | |
2354 | union real_extract du; | |
2355 | struct addr_const addr; | |
2356 | } un; | |
2357 | }; | |
2358 | ||
2359 | /* Express an rtx for a constant integer (perhaps symbolic) | |
2360 | as the sum of a symbol or label plus an explicit integer. | |
2361 | They are stored into VALUE. */ | |
2362 | ||
2363 | static void | |
2364 | decode_rtx_const (mode, x, value) | |
2365 | enum machine_mode mode; | |
2366 | rtx x; | |
2367 | struct rtx_const *value; | |
2368 | { | |
2369 | /* Clear the whole structure, including any gaps. */ | |
2370 | ||
2371 | { | |
2372 | int *p = (int *) value; | |
2373 | int *end = (int *) (value + 1); | |
2374 | while (p < end) | |
2375 | *p++ = 0; | |
2376 | } | |
2377 | ||
2378 | value->kind = RTX_INT; /* Most usual kind. */ | |
2379 | value->mode = mode; | |
2380 | ||
2381 | switch (GET_CODE (x)) | |
2382 | { | |
2383 | case CONST_DOUBLE: | |
2384 | value->kind = RTX_DOUBLE; | |
2385 | value->mode = GET_MODE (x); | |
2386 | bcopy (&CONST_DOUBLE_LOW (x), &value->un.du, sizeof value->un.du); | |
2387 | break; | |
2388 | ||
2389 | case CONST_INT: | |
2390 | value->un.addr.offset = INTVAL (x); | |
2391 | break; | |
2392 | ||
2393 | case SYMBOL_REF: | |
2394 | case LABEL_REF: | |
3d037392 | 2395 | case PC: |
79e68feb RS |
2396 | value->un.addr.base = x; |
2397 | break; | |
2398 | ||
2399 | case CONST: | |
2400 | x = XEXP (x, 0); | |
2401 | if (GET_CODE (x) == PLUS) | |
2402 | { | |
2403 | value->un.addr.base = XEXP (x, 0); | |
2404 | if (GET_CODE (XEXP (x, 1)) != CONST_INT) | |
2405 | abort (); | |
2406 | value->un.addr.offset = INTVAL (XEXP (x, 1)); | |
2407 | } | |
2408 | else if (GET_CODE (x) == MINUS) | |
2409 | { | |
2410 | value->un.addr.base = XEXP (x, 0); | |
2411 | if (GET_CODE (XEXP (x, 1)) != CONST_INT) | |
2412 | abort (); | |
2413 | value->un.addr.offset = - INTVAL (XEXP (x, 1)); | |
2414 | } | |
2415 | else | |
2416 | abort (); | |
2417 | break; | |
2418 | ||
2419 | default: | |
2420 | abort (); | |
2421 | } | |
2422 | ||
2423 | if (value->kind == RTX_INT && value->un.addr.base != 0) | |
2424 | switch (GET_CODE (value->un.addr.base)) | |
2425 | { | |
2426 | case SYMBOL_REF: | |
2427 | case LABEL_REF: | |
2428 | /* Use the string's address, not the SYMBOL_REF's address, | |
2429 | for the sake of addresses of library routines. | |
2430 | For a LABEL_REF, compare labels. */ | |
2431 | value->un.addr.base = XEXP (value->un.addr.base, 0); | |
2432 | } | |
2433 | } | |
2434 | ||
57632c51 RS |
2435 | /* Given a MINUS expression, simplify it if both sides |
2436 | include the same symbol. */ | |
2437 | ||
2438 | rtx | |
2439 | simplify_subtraction (x) | |
2440 | rtx x; | |
2441 | { | |
2442 | struct rtx_const val0, val1; | |
2443 | ||
2444 | decode_rtx_const (GET_MODE (x), XEXP (x, 0), &val0); | |
2445 | decode_rtx_const (GET_MODE (x), XEXP (x, 1), &val1); | |
2446 | ||
2447 | if (val0.un.addr.base == val1.un.addr.base) | |
2448 | return GEN_INT (val0.un.addr.offset - val1.un.addr.offset); | |
2449 | return x; | |
2450 | } | |
2451 | ||
79e68feb RS |
2452 | /* Compute a hash code for a constant RTL expression. */ |
2453 | ||
2454 | int | |
2455 | const_hash_rtx (mode, x) | |
2456 | enum machine_mode mode; | |
2457 | rtx x; | |
2458 | { | |
2459 | register int hi, i; | |
2460 | ||
2461 | struct rtx_const value; | |
2462 | decode_rtx_const (mode, x, &value); | |
2463 | ||
2464 | /* Compute hashing function */ | |
2465 | hi = 0; | |
2466 | for (i = 0; i < sizeof value / sizeof (int); i++) | |
2467 | hi += ((int *) &value)[i]; | |
2468 | ||
2469 | hi &= (1 << HASHBITS) - 1; | |
2470 | hi %= MAX_RTX_HASH_TABLE; | |
2471 | return hi; | |
2472 | } | |
2473 | ||
2474 | /* Compare a constant rtl object X with a constant-descriptor DESC. | |
2475 | Return 1 if DESC describes a constant with the same value as X. */ | |
2476 | ||
2477 | static int | |
2478 | compare_constant_rtx (mode, x, desc) | |
2479 | enum machine_mode mode; | |
2480 | rtx x; | |
2481 | struct constant_descriptor *desc; | |
2482 | { | |
2483 | register int *p = (int *) desc->contents; | |
2484 | register int *strp; | |
2485 | register int len; | |
2486 | struct rtx_const value; | |
2487 | ||
2488 | decode_rtx_const (mode, x, &value); | |
2489 | strp = (int *) &value; | |
2490 | len = sizeof value / sizeof (int); | |
2491 | ||
2492 | /* Compare constant contents. */ | |
2493 | while (--len >= 0) | |
2494 | if (*p++ != *strp++) | |
2495 | return 0; | |
2496 | ||
2497 | return 1; | |
2498 | } | |
2499 | ||
2500 | /* Construct a constant descriptor for the rtl-expression X. | |
2501 | It is up to the caller to enter the descriptor in the hash table. */ | |
2502 | ||
2503 | static struct constant_descriptor * | |
2504 | record_constant_rtx (mode, x) | |
2505 | enum machine_mode mode; | |
2506 | rtx x; | |
2507 | { | |
2508 | struct constant_descriptor *ptr; | |
2509 | char *label; | |
2510 | struct rtx_const value; | |
2511 | ||
2512 | decode_rtx_const (mode, x, &value); | |
2513 | ||
2514 | obstack_grow (current_obstack, &ptr, sizeof ptr); | |
2515 | obstack_grow (current_obstack, &label, sizeof label); | |
2516 | ||
2517 | /* Record constant contents. */ | |
2518 | obstack_grow (current_obstack, &value, sizeof value); | |
2519 | ||
2520 | return (struct constant_descriptor *) obstack_finish (current_obstack); | |
2521 | } | |
2522 | \f | |
2523 | /* Given a constant rtx X, make (or find) a memory constant for its value | |
2524 | and return a MEM rtx to refer to it in memory. */ | |
2525 | ||
2526 | rtx | |
2527 | force_const_mem (mode, x) | |
2528 | enum machine_mode mode; | |
2529 | rtx x; | |
2530 | { | |
2531 | register int hash; | |
2532 | register struct constant_descriptor *desc; | |
2533 | char label[256]; | |
2534 | char *found = 0; | |
2535 | rtx def; | |
2536 | ||
2537 | /* If we want this CONST_DOUBLE in the same mode as it is in memory | |
2538 | (this will always be true for floating CONST_DOUBLEs that have been | |
2539 | placed in memory, but not for VOIDmode (integer) CONST_DOUBLEs), | |
2540 | use the previous copy. Otherwise, make a new one. Note that in | |
2541 | the unlikely event that this same CONST_DOUBLE is used in two different | |
2542 | modes in an alternating fashion, we will allocate a lot of different | |
2543 | memory locations, but this should be extremely rare. */ | |
2544 | ||
57632c51 RS |
2545 | /* Don't use CONST_DOUBLE_MEM in a nested function. |
2546 | Nested functions have their own constant pools, | |
2547 | so they can't share the same values in CONST_DOUBLE_MEM | |
2548 | with the containing function. */ | |
2549 | if (outer_function_chain == 0) | |
2550 | if (GET_CODE (x) == CONST_DOUBLE | |
2551 | && GET_CODE (CONST_DOUBLE_MEM (x)) == MEM | |
2552 | && GET_MODE (CONST_DOUBLE_MEM (x)) == mode) | |
2553 | return CONST_DOUBLE_MEM (x); | |
79e68feb RS |
2554 | |
2555 | /* Compute hash code of X. Search the descriptors for that hash code | |
2556 | to see if any of them describes X. If yes, the descriptor records | |
2557 | the label number already assigned. */ | |
2558 | ||
2559 | hash = const_hash_rtx (mode, x); | |
2560 | ||
2561 | for (desc = const_rtx_hash_table[hash]; desc; desc = desc->next) | |
2562 | if (compare_constant_rtx (mode, x, desc)) | |
2563 | { | |
2564 | found = desc->label; | |
2565 | break; | |
2566 | } | |
2567 | ||
2568 | if (found == 0) | |
2569 | { | |
2570 | register struct pool_constant *pool; | |
2571 | register struct pool_sym *sym; | |
2572 | int align; | |
2573 | ||
2574 | /* No constant equal to X is known to have been output. | |
2575 | Make a constant descriptor to enter X in the hash table. | |
2576 | Assign the label number and record it in the descriptor for | |
2577 | future calls to this function to find. */ | |
2578 | ||
2579 | desc = record_constant_rtx (mode, x); | |
2580 | desc->next = const_rtx_hash_table[hash]; | |
2581 | const_rtx_hash_table[hash] = desc; | |
2582 | ||
2583 | /* Align the location counter as required by EXP's data type. */ | |
2584 | align = (mode == VOIDmode) ? UNITS_PER_WORD : GET_MODE_SIZE (mode); | |
2585 | if (align > BIGGEST_ALIGNMENT / BITS_PER_UNIT) | |
2586 | align = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
2587 | ||
2588 | pool_offset += align - 1; | |
2589 | pool_offset &= ~ (align - 1); | |
2590 | ||
2591 | /* Allocate a pool constant descriptor, fill it in, and chain it in. */ | |
2592 | ||
2593 | pool = (struct pool_constant *) oballoc (sizeof (struct pool_constant)); | |
2594 | pool->desc = desc; | |
2595 | pool->constant = x; | |
2596 | pool->mode = mode; | |
2597 | pool->labelno = const_labelno; | |
2598 | pool->align = align; | |
2599 | pool->offset = pool_offset; | |
2600 | pool->next = 0; | |
2601 | ||
2602 | if (last_pool == 0) | |
2603 | first_pool = pool; | |
2604 | else | |
2605 | last_pool->next = pool; | |
2606 | ||
2607 | last_pool = pool; | |
2608 | pool_offset += GET_MODE_SIZE (mode); | |
2609 | ||
2610 | /* Create a string containing the label name, in LABEL. */ | |
2611 | ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno); | |
2612 | ||
2613 | ++const_labelno; | |
2614 | ||
2615 | desc->label = found | |
2616 | = (char *) obstack_copy0 (saveable_obstack, label, strlen (label)); | |
2617 | ||
2618 | /* Add label to symbol hash table. */ | |
2619 | hash = SYMHASH (found); | |
2620 | sym = (struct pool_sym *) oballoc (sizeof (struct pool_sym)); | |
2621 | sym->label = found; | |
2622 | sym->pool = pool; | |
2623 | sym->next = const_rtx_sym_hash_table[hash]; | |
2624 | const_rtx_sym_hash_table[hash] = sym; | |
2625 | } | |
2626 | ||
2627 | /* We have a symbol name; construct the SYMBOL_REF and the MEM. */ | |
2628 | ||
2629 | def = gen_rtx (MEM, mode, gen_rtx (SYMBOL_REF, Pmode, found)); | |
2630 | ||
2631 | RTX_UNCHANGING_P (def) = 1; | |
2632 | /* Mark the symbol_ref as belonging to this constants pool. */ | |
2633 | CONSTANT_POOL_ADDRESS_P (XEXP (def, 0)) = 1; | |
2634 | current_function_uses_const_pool = 1; | |
2635 | ||
57632c51 RS |
2636 | if (outer_function_chain == 0) |
2637 | if (GET_CODE (x) == CONST_DOUBLE) | |
2638 | { | |
2639 | if (CONST_DOUBLE_MEM (x) == cc0_rtx) | |
2640 | { | |
2641 | CONST_DOUBLE_CHAIN (x) = const_double_chain; | |
2642 | const_double_chain = x; | |
2643 | } | |
2644 | CONST_DOUBLE_MEM (x) = def; | |
2645 | } | |
79e68feb RS |
2646 | |
2647 | return def; | |
2648 | } | |
2649 | \f | |
2650 | /* Given a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true, return a pointer to | |
2651 | the corresponding pool_constant structure. */ | |
2652 | ||
2653 | static struct pool_constant * | |
2654 | find_pool_constant (addr) | |
2655 | rtx addr; | |
2656 | { | |
2657 | struct pool_sym *sym; | |
2658 | char *label = XSTR (addr, 0); | |
2659 | ||
2660 | for (sym = const_rtx_sym_hash_table[SYMHASH (label)]; sym; sym = sym->next) | |
2661 | if (sym->label == label) | |
2662 | return sym->pool; | |
2663 | ||
2664 | abort (); | |
2665 | } | |
2666 | ||
2667 | /* Given a constant pool SYMBOL_REF, return the corresponding constant. */ | |
2668 | ||
2669 | rtx | |
2670 | get_pool_constant (addr) | |
2671 | rtx addr; | |
2672 | { | |
2673 | return (find_pool_constant (addr))->constant; | |
2674 | } | |
2675 | ||
2676 | /* Similar, return the mode. */ | |
2677 | ||
2678 | enum machine_mode | |
2679 | get_pool_mode (addr) | |
2680 | rtx addr; | |
2681 | { | |
2682 | return (find_pool_constant (addr))->mode; | |
2683 | } | |
2684 | ||
2685 | /* Similar, return the offset in the constant pool. */ | |
2686 | ||
2687 | int | |
2688 | get_pool_offset (addr) | |
2689 | rtx addr; | |
2690 | { | |
2691 | return (find_pool_constant (addr))->offset; | |
2692 | } | |
2693 | ||
2694 | /* Return the size of the constant pool. */ | |
2695 | ||
2696 | int | |
2697 | get_pool_size () | |
2698 | { | |
2699 | return pool_offset; | |
2700 | } | |
2701 | \f | |
2702 | /* Write all the constants in the constant pool. */ | |
2703 | ||
2704 | void | |
2705 | output_constant_pool (fnname, fndecl) | |
2706 | char *fnname; | |
2707 | tree fndecl; | |
2708 | { | |
2709 | struct pool_constant *pool; | |
2710 | rtx x; | |
2711 | union real_extract u; | |
2712 | ||
2713 | #ifdef ASM_OUTPUT_POOL_PROLOGUE | |
2714 | ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool_offset); | |
2715 | #endif | |
2716 | ||
2717 | for (pool = first_pool; pool; pool = pool->next) | |
2718 | { | |
2719 | x = pool->constant; | |
2720 | ||
2721 | /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF) | |
2722 | whose CODE_LABEL has been deleted. This can occur if a jump table | |
2723 | is eliminated by optimization. If so, write a constant of zero | |
7b2b3f1f RK |
2724 | instead. Note that this can also happen by turning the |
2725 | CODE_LABEL into a NOTE. */ | |
2726 | if (((GET_CODE (x) == LABEL_REF | |
2727 | && (INSN_DELETED_P (XEXP (x, 0)) | |
2728 | || GET_CODE (XEXP (x, 0)) == NOTE))) | |
79e68feb RS |
2729 | || (GET_CODE (x) == CONST && GET_CODE (XEXP (x, 0)) == PLUS |
2730 | && GET_CODE (XEXP (XEXP (x, 0), 0)) == LABEL_REF | |
7b2b3f1f RK |
2731 | && (INSN_DELETED_P (XEXP (XEXP (XEXP (x, 0), 0), 0)) |
2732 | || GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 0)) == NOTE))) | |
79e68feb RS |
2733 | x = const0_rtx; |
2734 | ||
2735 | /* First switch to correct section. */ | |
2736 | #ifdef SELECT_RTX_SECTION | |
2737 | SELECT_RTX_SECTION (pool->mode, x); | |
2738 | #else | |
2739 | readonly_data_section (); | |
2740 | #endif | |
2741 | ||
2742 | #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY | |
2743 | ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, pool->mode, | |
2744 | pool->align, pool->labelno, done); | |
2745 | #endif | |
2746 | ||
2747 | if (pool->align > 1) | |
2748 | ASM_OUTPUT_ALIGN (asm_out_file, exact_log2 (pool->align)); | |
2749 | ||
2750 | /* Output the label. */ | |
2751 | ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LC", pool->labelno); | |
2752 | ||
2753 | /* Output the value of the constant itself. */ | |
2754 | switch (GET_MODE_CLASS (pool->mode)) | |
2755 | { | |
2756 | case MODE_FLOAT: | |
2757 | if (GET_CODE (x) != CONST_DOUBLE) | |
2758 | abort (); | |
2759 | ||
2760 | bcopy (&CONST_DOUBLE_LOW (x), &u, sizeof u); | |
2761 | assemble_real (u.d, pool->mode); | |
2762 | break; | |
2763 | ||
2764 | case MODE_INT: | |
ab8ab9d0 | 2765 | case MODE_PARTIAL_INT: |
79e68feb RS |
2766 | assemble_integer (x, GET_MODE_SIZE (pool->mode), 1); |
2767 | break; | |
2768 | ||
2769 | default: | |
2770 | abort (); | |
2771 | } | |
2772 | ||
2773 | done: ; | |
2774 | } | |
2775 | ||
2776 | /* Done with this pool. */ | |
2777 | first_pool = last_pool = 0; | |
2778 | } | |
2779 | \f | |
2780 | /* Find all the constants whose addresses are referenced inside of EXP, | |
2781 | and make sure assembler code with a label has been output for each one. | |
2782 | Indicate whether an ADDR_EXPR has been encountered. */ | |
2783 | ||
2784 | int | |
2785 | output_addressed_constants (exp) | |
2786 | tree exp; | |
2787 | { | |
2788 | int reloc = 0; | |
2789 | ||
2790 | switch (TREE_CODE (exp)) | |
2791 | { | |
2792 | case ADDR_EXPR: | |
2793 | { | |
2794 | register tree constant = TREE_OPERAND (exp, 0); | |
2795 | ||
2796 | while (TREE_CODE (constant) == COMPONENT_REF) | |
2797 | { | |
2798 | constant = TREE_OPERAND (constant, 0); | |
2799 | } | |
2800 | ||
2801 | if (TREE_CODE_CLASS (TREE_CODE (constant)) == 'c' | |
2802 | || TREE_CODE (constant) == CONSTRUCTOR) | |
2803 | /* No need to do anything here | |
2804 | for addresses of variables or functions. */ | |
2805 | output_constant_def (constant); | |
2806 | } | |
2807 | reloc = 1; | |
2808 | break; | |
2809 | ||
2810 | case PLUS_EXPR: | |
2811 | case MINUS_EXPR: | |
2812 | reloc = output_addressed_constants (TREE_OPERAND (exp, 0)); | |
2813 | reloc |= output_addressed_constants (TREE_OPERAND (exp, 1)); | |
2814 | break; | |
2815 | ||
2816 | case NOP_EXPR: | |
2817 | case CONVERT_EXPR: | |
37a52112 | 2818 | case NON_LVALUE_EXPR: |
79e68feb RS |
2819 | reloc = output_addressed_constants (TREE_OPERAND (exp, 0)); |
2820 | break; | |
2821 | ||
2822 | case CONSTRUCTOR: | |
2823 | { | |
2824 | register tree link; | |
2825 | for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link)) | |
2826 | if (TREE_VALUE (link) != 0) | |
2827 | reloc |= output_addressed_constants (TREE_VALUE (link)); | |
2828 | } | |
2829 | break; | |
2830 | ||
2831 | case ERROR_MARK: | |
2832 | break; | |
2833 | } | |
2834 | return reloc; | |
2835 | } | |
2836 | \f | |
2837 | /* Output assembler code for constant EXP to FILE, with no label. | |
2838 | This includes the pseudo-op such as ".int" or ".byte", and a newline. | |
2839 | Assumes output_addressed_constants has been done on EXP already. | |
2840 | ||
2841 | Generate exactly SIZE bytes of assembler data, padding at the end | |
2842 | with zeros if necessary. SIZE must always be specified. | |
2843 | ||
2844 | SIZE is important for structure constructors, | |
2845 | since trailing members may have been omitted from the constructor. | |
2846 | It is also important for initialization of arrays from string constants | |
2847 | since the full length of the string constant might not be wanted. | |
2848 | It is also needed for initialization of unions, where the initializer's | |
2849 | type is just one member, and that may not be as long as the union. | |
2850 | ||
2851 | There a case in which we would fail to output exactly SIZE bytes: | |
2852 | for a structure constructor that wants to produce more than SIZE bytes. | |
2853 | But such constructors will never be generated for any possible input. */ | |
2854 | ||
2855 | void | |
2856 | output_constant (exp, size) | |
2857 | register tree exp; | |
2858 | register int size; | |
2859 | { | |
2860 | register enum tree_code code = TREE_CODE (TREE_TYPE (exp)); | |
2861 | rtx x; | |
2862 | ||
2863 | if (size == 0) | |
2864 | return; | |
2865 | ||
fff9e713 MT |
2866 | /* Allow a constructor with no elements for any data type. |
2867 | This means to fill the space with zeros. */ | |
77fa0940 | 2868 | if (TREE_CODE (exp) == CONSTRUCTOR && CONSTRUCTOR_ELTS (exp) == 0) |
fff9e713 MT |
2869 | { |
2870 | assemble_zeros (size); | |
2871 | return; | |
2872 | } | |
2873 | ||
79e68feb RS |
2874 | /* Eliminate the NOP_EXPR that makes a cast not be an lvalue. |
2875 | That way we get the constant (we hope) inside it. */ | |
2876 | if (TREE_CODE (exp) == NOP_EXPR | |
2877 | && TREE_TYPE (exp) == TREE_TYPE (TREE_OPERAND (exp, 0))) | |
2878 | exp = TREE_OPERAND (exp, 0); | |
2879 | ||
2880 | switch (code) | |
2881 | { | |
644ea577 RS |
2882 | case CHAR_TYPE: |
2883 | case BOOLEAN_TYPE: | |
79e68feb RS |
2884 | case INTEGER_TYPE: |
2885 | case ENUMERAL_TYPE: | |
2886 | case POINTER_TYPE: | |
2887 | case REFERENCE_TYPE: | |
2888 | /* ??? What about (int)((float)(int)&foo + 4) */ | |
2889 | while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR | |
2890 | || TREE_CODE (exp) == NON_LVALUE_EXPR) | |
2891 | exp = TREE_OPERAND (exp, 0); | |
2892 | ||
37366632 | 2893 | if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode, |
79e68feb RS |
2894 | EXPAND_INITIALIZER), |
2895 | size, 0)) | |
2896 | error ("initializer for integer value is too complicated"); | |
2897 | size = 0; | |
2898 | break; | |
2899 | ||
2900 | case REAL_TYPE: | |
2901 | if (TREE_CODE (exp) != REAL_CST) | |
2902 | error ("initializer for floating value is not a floating constant"); | |
2903 | ||
2904 | assemble_real (TREE_REAL_CST (exp), | |
2905 | mode_for_size (size * BITS_PER_UNIT, MODE_FLOAT, 0)); | |
2906 | size = 0; | |
2907 | break; | |
2908 | ||
2909 | case COMPLEX_TYPE: | |
2910 | output_constant (TREE_REALPART (exp), size / 2); | |
2911 | output_constant (TREE_IMAGPART (exp), size / 2); | |
2912 | size -= (size / 2) * 2; | |
2913 | break; | |
2914 | ||
2915 | case ARRAY_TYPE: | |
2916 | if (TREE_CODE (exp) == CONSTRUCTOR) | |
2917 | { | |
2918 | output_constructor (exp, size); | |
2919 | return; | |
2920 | } | |
2921 | else if (TREE_CODE (exp) == STRING_CST) | |
2922 | { | |
2923 | int excess = 0; | |
2924 | ||
2925 | if (size > TREE_STRING_LENGTH (exp)) | |
2926 | { | |
2927 | excess = size - TREE_STRING_LENGTH (exp); | |
2928 | size = TREE_STRING_LENGTH (exp); | |
2929 | } | |
2930 | ||
2931 | assemble_string (TREE_STRING_POINTER (exp), size); | |
2932 | size = excess; | |
2933 | } | |
2934 | else | |
2935 | abort (); | |
2936 | break; | |
2937 | ||
2938 | case RECORD_TYPE: | |
2939 | case UNION_TYPE: | |
2940 | if (TREE_CODE (exp) == CONSTRUCTOR) | |
2941 | output_constructor (exp, size); | |
2942 | else | |
2943 | abort (); | |
2944 | return; | |
2945 | } | |
2946 | ||
2947 | if (size > 0) | |
2948 | assemble_zeros (size); | |
2949 | } | |
2950 | \f | |
2951 | /* Subroutine of output_constant, used for CONSTRUCTORs | |
2952 | (aggregate constants). | |
2953 | Generate at least SIZE bytes, padding if necessary. */ | |
2954 | ||
2955 | void | |
2956 | output_constructor (exp, size) | |
2957 | tree exp; | |
2958 | int size; | |
2959 | { | |
2960 | register tree link, field = 0; | |
2961 | /* Number of bytes output or skipped so far. | |
2962 | In other words, current position within the constructor. */ | |
2963 | int total_bytes = 0; | |
2964 | /* Non-zero means BYTE contains part of a byte, to be output. */ | |
2965 | int byte_buffer_in_use = 0; | |
2966 | register int byte; | |
2967 | ||
37366632 | 2968 | if (HOST_BITS_PER_WIDE_INT < BITS_PER_UNIT) |
79e68feb RS |
2969 | abort (); |
2970 | ||
2971 | if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE) | |
2972 | field = TYPE_FIELDS (TREE_TYPE (exp)); | |
2973 | ||
2974 | /* As LINK goes through the elements of the constant, | |
2975 | FIELD goes through the structure fields, if the constant is a structure. | |
2976 | if the constant is a union, then we override this, | |
2977 | by getting the field from the TREE_LIST element. | |
2978 | But the constant could also be an array. Then FIELD is zero. */ | |
2979 | for (link = CONSTRUCTOR_ELTS (exp); | |
2980 | link; | |
2981 | link = TREE_CHAIN (link), | |
2982 | field = field ? TREE_CHAIN (field) : 0) | |
2983 | { | |
2984 | tree val = TREE_VALUE (link); | |
2985 | /* the element in a union constructor specifies the proper field. */ | |
2986 | if (TREE_PURPOSE (link) != 0) | |
2987 | field = TREE_PURPOSE (link); | |
2988 | ||
2989 | /* Eliminate the marker that makes a cast not be an lvalue. */ | |
d964285c CH |
2990 | if (val != 0) |
2991 | STRIP_NOPS (val); | |
79e68feb RS |
2992 | |
2993 | if (field == 0 || !DECL_BIT_FIELD (field)) | |
2994 | { | |
2995 | register int fieldsize; | |
2996 | /* Since this structure is static, | |
2997 | we know the positions are constant. */ | |
2998 | int bitpos = (field ? (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field)) | |
2999 | / BITS_PER_UNIT) | |
3000 | : 0); | |
3001 | ||
3002 | /* An element that is not a bit-field. | |
3003 | Output any buffered-up bit-fields preceding it. */ | |
3004 | if (byte_buffer_in_use) | |
3005 | { | |
3006 | ASM_OUTPUT_BYTE (asm_out_file, byte); | |
3007 | total_bytes++; | |
3008 | byte_buffer_in_use = 0; | |
3009 | } | |
3010 | ||
3011 | /* Advance to offset of this element. | |
3012 | Note no alignment needed in an array, since that is guaranteed | |
3013 | if each element has the proper size. */ | |
3014 | if (field != 0 && bitpos != total_bytes) | |
3015 | { | |
3016 | assemble_zeros (bitpos - total_bytes); | |
3017 | total_bytes = bitpos; | |
3018 | } | |
3019 | ||
3020 | /* Determine size this element should occupy. */ | |
3021 | if (field) | |
3022 | { | |
3023 | if (TREE_CODE (DECL_SIZE (field)) != INTEGER_CST) | |
3024 | abort (); | |
3025 | if (TREE_INT_CST_LOW (DECL_SIZE (field)) > 100000) | |
3026 | { | |
3027 | /* This avoids overflow trouble. */ | |
3028 | tree size_tree = size_binop (CEIL_DIV_EXPR, | |
3029 | DECL_SIZE (field), | |
3030 | size_int (BITS_PER_UNIT)); | |
3031 | fieldsize = TREE_INT_CST_LOW (size_tree); | |
3032 | } | |
3033 | else | |
3034 | { | |
3035 | fieldsize = TREE_INT_CST_LOW (DECL_SIZE (field)); | |
3036 | fieldsize = (fieldsize + BITS_PER_UNIT - 1) / BITS_PER_UNIT; | |
3037 | } | |
3038 | } | |
3039 | else | |
3040 | fieldsize = int_size_in_bytes (TREE_TYPE (TREE_TYPE (exp))); | |
3041 | ||
3042 | /* Output the element's initial value. */ | |
3043 | if (val == 0) | |
3044 | assemble_zeros (fieldsize); | |
3045 | else | |
3046 | output_constant (val, fieldsize); | |
3047 | ||
3048 | /* Count its size. */ | |
3049 | total_bytes += fieldsize; | |
3050 | } | |
3051 | else if (val != 0 && TREE_CODE (val) != INTEGER_CST) | |
3052 | error ("invalid initial value for member `%s'", | |
3053 | IDENTIFIER_POINTER (DECL_NAME (field))); | |
3054 | else | |
3055 | { | |
3056 | /* Element that is a bit-field. */ | |
3057 | ||
3058 | int next_offset = TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field)); | |
3059 | int end_offset | |
3060 | = (next_offset + TREE_INT_CST_LOW (DECL_SIZE (field))); | |
3061 | ||
3062 | if (val == 0) | |
3063 | val = integer_zero_node; | |
3064 | ||
3065 | /* If this field does not start in this (or, next) byte, | |
3066 | skip some bytes. */ | |
3067 | if (next_offset / BITS_PER_UNIT != total_bytes) | |
3068 | { | |
3069 | /* Output remnant of any bit field in previous bytes. */ | |
3070 | if (byte_buffer_in_use) | |
3071 | { | |
3072 | ASM_OUTPUT_BYTE (asm_out_file, byte); | |
3073 | total_bytes++; | |
3074 | byte_buffer_in_use = 0; | |
3075 | } | |
3076 | ||
3077 | /* If still not at proper byte, advance to there. */ | |
3078 | if (next_offset / BITS_PER_UNIT != total_bytes) | |
3079 | { | |
3080 | assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes); | |
3081 | total_bytes = next_offset / BITS_PER_UNIT; | |
3082 | } | |
3083 | } | |
3084 | ||
3085 | if (! byte_buffer_in_use) | |
3086 | byte = 0; | |
3087 | ||
3088 | /* We must split the element into pieces that fall within | |
3089 | separate bytes, and combine each byte with previous or | |
3090 | following bit-fields. */ | |
3091 | ||
b4ac57ab | 3092 | /* next_offset is the offset n fbits from the beginning of |
79e68feb RS |
3093 | the structure to the next bit of this element to be processed. |
3094 | end_offset is the offset of the first bit past the end of | |
3095 | this element. */ | |
3096 | while (next_offset < end_offset) | |
3097 | { | |
3098 | int this_time; | |
3099 | int shift, value; | |
3100 | int next_byte = next_offset / BITS_PER_UNIT; | |
3101 | int next_bit = next_offset % BITS_PER_UNIT; | |
3102 | ||
3103 | /* Advance from byte to byte | |
3104 | within this element when necessary. */ | |
3105 | while (next_byte != total_bytes) | |
3106 | { | |
3107 | ASM_OUTPUT_BYTE (asm_out_file, byte); | |
3108 | total_bytes++; | |
3109 | byte = 0; | |
3110 | } | |
3111 | ||
3112 | /* Number of bits we can process at once | |
3113 | (all part of the same byte). */ | |
3114 | this_time = MIN (end_offset - next_offset, | |
3115 | BITS_PER_UNIT - next_bit); | |
3116 | #if BYTES_BIG_ENDIAN | |
3117 | /* On big-endian machine, take the most significant bits | |
3118 | first (of the bits that are significant) | |
3119 | and put them into bytes from the most significant end. */ | |
3120 | shift = end_offset - next_offset - this_time; | |
3121 | /* Don't try to take a bunch of bits that cross | |
3122 | the word boundary in the INTEGER_CST. */ | |
37366632 RK |
3123 | if (shift < HOST_BITS_PER_WIDE_INT |
3124 | && shift + this_time > HOST_BITS_PER_WIDE_INT) | |
79e68feb | 3125 | { |
37366632 RK |
3126 | this_time -= (HOST_BITS_PER_WIDE_INT - shift); |
3127 | shift = HOST_BITS_PER_WIDE_INT; | |
79e68feb RS |
3128 | } |
3129 | ||
3130 | /* Now get the bits from the appropriate constant word. */ | |
37366632 | 3131 | if (shift < HOST_BITS_PER_WIDE_INT) |
79e68feb RS |
3132 | { |
3133 | value = TREE_INT_CST_LOW (val); | |
3134 | } | |
37366632 | 3135 | else if (shift < 2 * HOST_BITS_PER_WIDE_INT) |
79e68feb RS |
3136 | { |
3137 | value = TREE_INT_CST_HIGH (val); | |
37366632 | 3138 | shift -= HOST_BITS_PER_WIDE_INT; |
79e68feb RS |
3139 | } |
3140 | else | |
3141 | abort (); | |
37366632 RK |
3142 | byte |= (((value >> shift) |
3143 | & (((HOST_WIDE_INT) 1 << this_time) - 1)) | |
79e68feb RS |
3144 | << (BITS_PER_UNIT - this_time - next_bit)); |
3145 | #else | |
3146 | /* On little-endian machines, | |
3147 | take first the least significant bits of the value | |
3148 | and pack them starting at the least significant | |
3149 | bits of the bytes. */ | |
3150 | shift = (next_offset | |
3151 | - TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field))); | |
3152 | /* Don't try to take a bunch of bits that cross | |
3153 | the word boundary in the INTEGER_CST. */ | |
37366632 RK |
3154 | if (shift < HOST_BITS_PER_WIDE_INT |
3155 | && shift + this_time > HOST_BITS_PER_WIDE_INT) | |
79e68feb | 3156 | { |
37366632 RK |
3157 | this_time -= (HOST_BITS_PER_WIDE_INT - shift); |
3158 | shift = HOST_BITS_PER_WIDE_INT; | |
79e68feb RS |
3159 | } |
3160 | ||
3161 | /* Now get the bits from the appropriate constant word. */ | |
3162 | if (shift < HOST_BITS_PER_INT) | |
3163 | value = TREE_INT_CST_LOW (val); | |
37366632 | 3164 | else if (shift < 2 * HOST_BITS_PER_WIDE_INT) |
79e68feb RS |
3165 | { |
3166 | value = TREE_INT_CST_HIGH (val); | |
37366632 | 3167 | shift -= HOST_BITS_PER_WIDE_INT; |
79e68feb RS |
3168 | } |
3169 | else | |
3170 | abort (); | |
37366632 RK |
3171 | byte |= ((value >> shift) |
3172 | & (((HOST_WIDE_INT) 1 << this_time) - 1)) << next_bit; | |
79e68feb RS |
3173 | #endif |
3174 | next_offset += this_time; | |
3175 | byte_buffer_in_use = 1; | |
3176 | } | |
3177 | } | |
3178 | } | |
3179 | if (byte_buffer_in_use) | |
3180 | { | |
3181 | ASM_OUTPUT_BYTE (asm_out_file, byte); | |
3182 | total_bytes++; | |
3183 | } | |
3184 | if (total_bytes < size) | |
3185 | assemble_zeros (size - total_bytes); | |
3186 | } |