1 /* RTL utility routines.
2 Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
24 #include "coretypes.h"
32 /* Indexed by rtx code, gives number of operands for an rtx with that code.
33 Does NOT include rtx header data (code and links). */
35 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) sizeof FORMAT - 1 ,
37 const unsigned char rtx_length[NUM_RTX_CODE] = {
43 /* Indexed by rtx code, gives the name of that kind of rtx, as a C string. */
45 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) NAME ,
47 const char * const rtx_name[NUM_RTX_CODE] = {
48 #include "rtl.def" /* rtl expressions are documented here */
53 /* Indexed by rtx code, gives a sequence of operand-types for
54 rtx's of that code. The sequence is a C string in which
55 each character describes one operand. */
57 const char * const rtx_format[NUM_RTX_CODE] = {
59 can cause a warning message
60 "0" field is unused (or used in a phase-dependent manner)
64 "n" like "i", but prints entries from `note_insn_name'
65 "w" an integer of width HOST_BITS_PER_WIDE_INT
67 "s" a pointer to a string
69 "S" like "s", but optional:
70 the containing rtx may end before this operand
71 "T" like "s", but treated specially by the RTL reader;
72 only found in machine description patterns.
73 "e" a pointer to an rtl expression
75 "E" a pointer to a vector that points to a number of rtl expressions
76 prints a list of the rtl expressions
77 "V" like "E", but optional:
78 the containing rtx may end before this operand
79 "u" a pointer to another insn
80 prints the uid of the insn.
81 "b" is a pointer to a bitmap header.
82 "B" is a basic block pointer.
83 "t" is a tree pointer. */
85 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) FORMAT ,
86 #include "rtl.def" /* rtl expressions are defined here */
90 /* Indexed by rtx code, gives a character representing the "class" of
91 that rtx code. See rtl.def for documentation on the defined classes. */
93 const char rtx_class[NUM_RTX_CODE] = {
94 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) CLASS,
95 #include "rtl.def" /* rtl expressions are defined here */
99 /* Names for kinds of NOTEs and REG_NOTEs. */
101 const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS] =
103 "", "NOTE_INSN_DELETED",
104 "NOTE_INSN_BLOCK_BEG", "NOTE_INSN_BLOCK_END",
105 "NOTE_INSN_LOOP_BEG", "NOTE_INSN_LOOP_END",
106 "NOTE_INSN_LOOP_CONT", "NOTE_INSN_LOOP_VTOP",
107 "NOTE_INSN_LOOP_END_TOP_COND", "NOTE_INSN_FUNCTION_END",
108 "NOTE_INSN_PROLOGUE_END", "NOTE_INSN_EPILOGUE_BEG",
109 "NOTE_INSN_DELETED_LABEL", "NOTE_INSN_FUNCTION_BEG",
110 "NOTE_INSN_EH_REGION_BEG", "NOTE_INSN_EH_REGION_END",
111 "NOTE_INSN_REPEATED_LINE_NUMBER",
112 "NOTE_INSN_BASIC_BLOCK", "NOTE_INSN_EXPECTED_VALUE",
113 "NOTE_INSN_PREDICTION"
116 const char * const reg_note_name[] =
118 "", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_EQUAL",
119 "REG_RETVAL", "REG_LIBCALL", "REG_NONNEG",
120 "REG_NO_CONFLICT", "REG_UNUSED", "REG_CC_SETTER", "REG_CC_USER",
121 "REG_LABEL", "REG_DEP_ANTI", "REG_DEP_OUTPUT", "REG_BR_PROB",
122 "REG_VALUE_PROFILE", "REG_NOALIAS", "REG_SAVE_AREA", "REG_BR_PRED",
123 "REG_FRAME_RELATED_EXPR", "REG_EH_CONTEXT", "REG_EH_REGION",
124 "REG_SAVE_NOTE", "REG_MAYBE_DEAD", "REG_NORETURN",
125 "REG_NON_LOCAL_GOTO", "REG_SETJMP", "REG_ALWAYS_RETURN",
130 /* Allocate an rtx vector of N elements.
131 Store the length, and initialize all elements to zero. */
138 rt = ggc_alloc_rtvec (n);
139 /* clear out the vector */
140 memset (&rt->elem[0], 0, n * sizeof (rtx));
142 PUT_NUM_ELEM (rt, n);
146 /* Allocate an rtx of code CODE. The CODE is stored in the rtx;
147 all the rest is initialized to zero. */
150 rtx_alloc (RTX_CODE code)
153 int n = GET_RTX_LENGTH (code);
155 rt = ggc_alloc_rtx (n);
157 /* We want to clear everything up to the FLD array. Normally, this
158 is one int, but we don't want to assume that and it isn't very
159 portable anyway; this is. */
161 memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));
167 /* Create a new copy of an rtx.
168 Recursively copies the operands of the rtx,
169 except for those few rtx codes that are sharable. */
177 const char *format_ptr;
179 code = GET_CODE (orig);
193 /* SCRATCH must be shared because they represent distinct values. */
198 /* CONST can be shared if it contains a SYMBOL_REF. If it contains
199 a LABEL_REF, it isn't sharable. */
200 if (GET_CODE (XEXP (orig, 0)) == PLUS
201 && GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF
202 && GET_CODE (XEXP (XEXP (orig, 0), 1)) == CONST_INT)
206 /* A MEM with a constant address is not sharable. The problem is that
207 the constant address may need to be reloaded. If the mem is shared,
208 then reloading one copy of this mem will cause all copies to appear
209 to have been reloaded. */
215 copy = rtx_alloc (code);
217 /* Copy the various flags, and other information. We assume that
218 all fields need copying, and then clear the fields that should
219 not be copied. That is the sensible default behavior, and forces
220 us to explicitly document why we are *not* copying a flag. */
221 memcpy (copy, orig, sizeof (struct rtx_def) - sizeof (rtunion));
223 /* We do not copy the USED flag, which is used as a mark bit during
224 walks over the RTL. */
225 RTX_FLAG (copy, used) = 0;
227 /* We do not copy FRAME_RELATED for INSNs. */
228 if (GET_RTX_CLASS (code) == 'i')
229 RTX_FLAG (copy, frame_related) = 0;
230 RTX_FLAG (copy, jump) = RTX_FLAG (orig, jump);
231 RTX_FLAG (copy, call) = RTX_FLAG (orig, call);
233 format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
235 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
237 copy->fld[i] = orig->fld[i];
238 switch (*format_ptr++)
241 if (XEXP (orig, i) != NULL)
242 XEXP (copy, i) = copy_rtx (XEXP (orig, i));
247 if (XVEC (orig, i) != NULL)
249 XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
250 for (j = 0; j < XVECLEN (copy, i); j++)
251 XVECEXP (copy, i, j) = copy_rtx (XVECEXP (orig, i, j));
264 /* These are left unchanged. */
274 /* Create a new copy of an rtx. Only copy just one level. */
277 shallow_copy_rtx (rtx orig)
279 RTX_CODE code = GET_CODE (orig);
280 size_t n = GET_RTX_LENGTH (code);
281 rtx copy = ggc_alloc_rtx (n);
284 sizeof (struct rtx_def) + sizeof (rtunion) * (n - 1));
289 /* This is 1 until after the rtl generation pass. */
290 int rtx_equal_function_value_matters;
292 /* Nonzero when we are generating CONCATs. */
293 int generating_concat_p;
295 /* Return 1 if X and Y are identical-looking rtx's.
296 This is the Lisp function EQUAL for rtx arguments. */
299 rtx_equal_p (rtx x, rtx y)
308 if (x == 0 || y == 0)
312 /* Rtx's of different codes cannot be equal. */
313 if (code != GET_CODE (y))
316 /* (MULT:SI x y) and (MULT:HI x y) are NOT equivalent.
317 (REG:SI x) and (REG:HI x) are NOT equivalent. */
319 if (GET_MODE (x) != GET_MODE (y))
322 /* Some RTL can be compared nonrecursively. */
326 /* Until rtl generation is complete, don't consider a reference
327 to the return register of the current function the same as
328 the return from a called function. This eases the job of
329 function integration. Once the distinction is no longer
330 needed, they can be considered equivalent. */
331 return (REGNO (x) == REGNO (y)
332 && (! rtx_equal_function_value_matters
333 || REG_FUNCTION_VALUE_P (x) == REG_FUNCTION_VALUE_P (y)));
336 return XEXP (x, 0) == XEXP (y, 0);
339 return XSTR (x, 0) == XSTR (y, 0);
351 /* Compare the elements. If any pair of corresponding elements
352 fail to match, return 0 for the whole things. */
354 fmt = GET_RTX_FORMAT (code);
355 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
360 if (XWINT (x, i) != XWINT (y, i))
366 if (XINT (x, i) != XINT (y, i))
372 /* Two vectors must have the same length. */
373 if (XVECLEN (x, i) != XVECLEN (y, i))
376 /* And the corresponding elements must match. */
377 for (j = 0; j < XVECLEN (x, i); j++)
378 if (rtx_equal_p (XVECEXP (x, i, j), XVECEXP (y, i, j)) == 0)
383 if (rtx_equal_p (XEXP (x, i), XEXP (y, i)) == 0)
389 if ((XSTR (x, i) || XSTR (y, i))
390 && (! XSTR (x, i) || ! XSTR (y, i)
391 || strcmp (XSTR (x, i), XSTR (y, i))))
396 /* These are just backpointers, so they don't matter. */
403 /* It is believed that rtx's at this level will never
404 contain anything but integers and other rtx's,
405 except for within LABEL_REFs and SYMBOL_REFs. */
413 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
415 rtl_check_failed_bounds (rtx r, int n, const char *file, int line,
419 ("RTL check: access of elt %d of `%s' with last elt %d in %s, at %s:%d",
420 n, GET_RTX_NAME (GET_CODE (r)), GET_RTX_LENGTH (GET_CODE (r)) - 1,
421 func, trim_filename (file), line);
425 rtl_check_failed_type1 (rtx r, int n, int c1, const char *file, int line,
429 ("RTL check: expected elt %d type '%c', have '%c' (rtx %s) in %s, at %s:%d",
430 n, c1, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
431 func, trim_filename (file), line);
435 rtl_check_failed_type2 (rtx r, int n, int c1, int c2, const char *file,
436 int line, const char *func)
439 ("RTL check: expected elt %d type '%c' or '%c', have '%c' (rtx %s) in %s, at %s:%d",
440 n, c1, c2, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
441 func, trim_filename (file), line);
445 rtl_check_failed_code1 (rtx r, enum rtx_code code, const char *file,
446 int line, const char *func)
448 internal_error ("RTL check: expected code `%s', have `%s' in %s, at %s:%d",
449 GET_RTX_NAME (code), GET_RTX_NAME (GET_CODE (r)), func,
450 trim_filename (file), line);
454 rtl_check_failed_code2 (rtx r, enum rtx_code code1, enum rtx_code code2,
455 const char *file, int line, const char *func)
458 ("RTL check: expected code `%s' or `%s', have `%s' in %s, at %s:%d",
459 GET_RTX_NAME (code1), GET_RTX_NAME (code2), GET_RTX_NAME (GET_CODE (r)),
460 func, trim_filename (file), line);
463 /* XXX Maybe print the vector? */
465 rtvec_check_failed_bounds (rtvec r, int n, const char *file, int line,
469 ("RTL check: access of elt %d of vector with last elt %d in %s, at %s:%d",
470 n, GET_NUM_ELEM (r) - 1, func, trim_filename (file), line);
472 #endif /* ENABLE_RTL_CHECKING */
474 #if defined ENABLE_RTL_FLAG_CHECKING
476 rtl_check_failed_flag (const char *name, rtx r, const char *file,
477 int line, const char *func)
480 ("RTL flag check: %s used with unexpected rtx code `%s' in %s, at %s:%d",
481 name, GET_RTX_NAME (GET_CODE (r)), func, trim_filename (file), line);
483 #endif /* ENABLE_RTL_FLAG_CHECKING */