1 /* Subroutines shared by all languages that are variants of C.
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 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
37 cpp_reader *parse_in; /* Declared in c-lex.h. */
39 #undef WCHAR_TYPE_SIZE
40 #define WCHAR_TYPE_SIZE TYPE_PRECISION (wchar_type_node)
42 /* We let tm.h override the types used here, to handle trivial differences
43 such as the choice of unsigned int or long unsigned int for size_t.
44 When machines start needing nontrivial differences in the size type,
45 it would be best to do something here to figure out automatically
46 from other information what type to use. */
49 #define SIZE_TYPE "long unsigned int"
53 #define WCHAR_TYPE "int"
57 #define PTRDIFF_TYPE "long int"
61 #define WINT_TYPE "unsigned int"
65 #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
67 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
73 #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
75 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
76 ? "long unsigned int" \
77 : "long long unsigned int"))
80 /* The following symbols are subsumed in the c_global_trees array, and
81 listed here individually for documentation purposes.
83 INTEGER_TYPE and REAL_TYPE nodes for the standard data types.
85 tree short_integer_type_node;
86 tree long_integer_type_node;
87 tree long_long_integer_type_node;
89 tree short_unsigned_type_node;
90 tree long_unsigned_type_node;
91 tree long_long_unsigned_type_node;
93 tree boolean_type_node;
94 tree boolean_false_node;
95 tree boolean_true_node;
97 tree ptrdiff_type_node;
99 tree unsigned_char_type_node;
100 tree signed_char_type_node;
101 tree wchar_type_node;
102 tree signed_wchar_type_node;
103 tree unsigned_wchar_type_node;
105 tree float_type_node;
106 tree double_type_node;
107 tree long_double_type_node;
109 tree complex_integer_type_node;
110 tree complex_float_type_node;
111 tree complex_double_type_node;
112 tree complex_long_double_type_node;
114 tree intQI_type_node;
115 tree intHI_type_node;
116 tree intSI_type_node;
117 tree intDI_type_node;
118 tree intTI_type_node;
120 tree unsigned_intQI_type_node;
121 tree unsigned_intHI_type_node;
122 tree unsigned_intSI_type_node;
123 tree unsigned_intDI_type_node;
124 tree unsigned_intTI_type_node;
126 tree widest_integer_literal_type_node;
127 tree widest_unsigned_literal_type_node;
129 Nodes for types `void *' and `const void *'.
131 tree ptr_type_node, const_ptr_type_node;
133 Nodes for types `char *' and `const char *'.
135 tree string_type_node, const_string_type_node;
137 Type `char[SOMENUMBER]'.
138 Used when an array of char is needed and the size is irrelevant.
140 tree char_array_type_node;
142 Type `int[SOMENUMBER]' or something like it.
143 Used when an array of int needed and the size is irrelevant.
145 tree int_array_type_node;
147 Type `wchar_t[SOMENUMBER]' or something like it.
148 Used when a wide string literal is created.
150 tree wchar_array_type_node;
152 Type `int ()' -- used for implicit declaration of functions.
154 tree default_function_type;
156 A VOID_TYPE node, packaged in a TREE_LIST.
160 The lazily created VAR_DECLS for __FUNCTION__, __PRETTY_FUNCTION__,
161 and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__
162 VAR_DECLS, but C++ does.)
164 tree function_name_decl_node;
165 tree pretty_function_name_declnode;
166 tree c99_function_name_decl_node;
168 Stack of nested function name VAR_DECLs.
170 tree saved_function_name_decls;
174 tree c_global_trees[CTI_MAX];
176 /* Nonzero means don't recognize the non-ANSI builtin functions. */
180 /* Nonzero means don't recognize the non-ANSI builtin functions.
183 int flag_no_nonansi_builtin;
185 /* Nonzero means give `double' the same size as `float'. */
187 int flag_short_double;
189 /* Nonzero means give `wchar_t' the same size as `short'. */
191 int flag_short_wchar;
193 /* Nonzero means warn about possible violations of sequence point rules. */
195 int warn_sequence_point;
197 /* The elements of `ridpointers' are identifier nodes for the reserved
198 type names and storage classes. It is indexed by a RID_... value. */
201 tree (*make_fname_decl) PARAMS ((tree, int));
203 /* If non-NULL, the address of a language-specific function that
204 returns 1 for language-specific statement codes. */
205 int (*lang_statement_code_p) PARAMS ((enum tree_code));
207 /* If non-NULL, the address of a language-specific function that takes
208 any action required right before expand_function_end is called. */
209 void (*lang_expand_function_end) PARAMS ((void));
211 /* If this variable is defined to a non-NULL value, it will be called
212 after the file has been completely parsed. */
213 void (*back_end_hook) PARAMS ((tree));
215 /* Nonzero means the expression being parsed will never be evaluated.
216 This is a count, since unevaluated expressions can nest. */
219 enum attrs {A_PACKED, A_NOCOMMON, A_COMMON, A_NORETURN, A_CONST, A_T_UNION,
220 A_NO_CHECK_MEMORY_USAGE, A_NO_INSTRUMENT_FUNCTION,
221 A_CONSTRUCTOR, A_DESTRUCTOR, A_MODE, A_SECTION, A_ALIGNED,
222 A_UNUSED, A_FORMAT, A_FORMAT_ARG, A_WEAK, A_ALIAS, A_MALLOC,
223 A_NO_LIMIT_STACK, A_PURE};
225 /* Information about how a function name is generated. */
228 tree *decl; /* pointer to the VAR_DECL. */
229 unsigned rid; /* RID number for the identifier. */
230 int pretty; /* How pretty is it? */
233 /* The three ways of getting then name of the current function. */
235 const struct fname_var_t fname_vars[] =
237 /* C99 compliant __func__, must be first. */
238 {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0},
239 /* GCC __FUNCTION__ compliant. */
240 {&function_name_decl_node, RID_FUNCTION_NAME, 0},
241 /* GCC __PRETTY_FUNCTION__ compliant. */
242 {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1},
246 static void add_attribute PARAMS ((enum attrs, const char *,
248 static void init_attributes PARAMS ((void));
249 static int default_valid_lang_attribute PARAMS ((tree, tree, tree, tree));
250 static int constant_fits_type_p PARAMS ((tree, tree));
252 /* Keep a stack of if statements. We record the number of compound
253 statements seen up to the if keyword, as well as the line number
254 and file of the if. If a potentially ambiguous else is seen, that
255 fact is recorded; the warning is issued when we can be sure that
256 the enclosing if statement does not have an else branch. */
266 static if_elt *if_stack;
268 /* Amount of space in the if statement stack. */
269 static int if_stack_space = 0;
272 static int if_stack_pointer = 0;
274 /* Record the start of an if-then, and record the start of it
275 for ambiguous else detection. */
278 c_expand_start_cond (cond, compstmt_count)
284 /* Make sure there is enough space on the stack. */
285 if (if_stack_space == 0)
288 if_stack = (if_elt *)xmalloc (10 * sizeof (if_elt));
290 else if (if_stack_space == if_stack_pointer)
292 if_stack_space += 10;
293 if_stack = (if_elt *)xrealloc (if_stack, if_stack_space * sizeof (if_elt));
296 if_stmt = build_stmt (IF_STMT, NULL_TREE, NULL_TREE, NULL_TREE);
297 IF_COND (if_stmt) = cond;
300 /* Record this if statement. */
301 if_stack[if_stack_pointer].compstmt_count = compstmt_count;
302 if_stack[if_stack_pointer].file = input_filename;
303 if_stack[if_stack_pointer].line = lineno;
304 if_stack[if_stack_pointer].needs_warning = 0;
305 if_stack[if_stack_pointer].if_stmt = if_stmt;
309 /* Called after the then-clause for an if-statement is processed. */
314 tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt;
315 RECHAIN_STMTS (if_stmt, THEN_CLAUSE (if_stmt));
318 /* Record the end of an if-then. Optionally warn if a nested
319 if statement had an ambiguous else clause. */
325 if (if_stack[if_stack_pointer].needs_warning)
326 warning_with_file_and_line (if_stack[if_stack_pointer].file,
327 if_stack[if_stack_pointer].line,
328 "suggest explicit braces to avoid ambiguous `else'");
329 last_expr_type = NULL_TREE;
332 /* Called between the then-clause and the else-clause
333 of an if-then-else. */
336 c_expand_start_else ()
338 /* An ambiguous else warning must be generated for the enclosing if
339 statement, unless we see an else branch for that one, too. */
341 && if_stack_pointer > 1
342 && (if_stack[if_stack_pointer - 1].compstmt_count
343 == if_stack[if_stack_pointer - 2].compstmt_count))
344 if_stack[if_stack_pointer - 2].needs_warning = 1;
346 /* Even if a nested if statement had an else branch, it can't be
347 ambiguous if this one also has an else. So don't warn in that
348 case. Also don't warn for any if statements nested in this else. */
349 if_stack[if_stack_pointer - 1].needs_warning = 0;
350 if_stack[if_stack_pointer - 1].compstmt_count--;
353 /* Called after the else-clause for an if-statement is processed. */
358 tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt;
359 RECHAIN_STMTS (if_stmt, ELSE_CLAUSE (if_stmt));
362 /* Push current bindings for the function name VAR_DECLS. */
368 tree saved = NULL_TREE;
370 for (ix = 0; fname_vars[ix].decl; ix++)
372 tree decl = *fname_vars[ix].decl;
376 saved = tree_cons (decl, build_int_2 (ix, 0), saved);
377 *fname_vars[ix].decl = NULL_TREE;
380 if (saved || saved_function_name_decls)
381 /* Normally they'll have been NULL, so only push if we've got a
382 stack, or they are non-NULL. */
383 saved_function_name_decls = tree_cons (saved, NULL_TREE,
384 saved_function_name_decls);
387 /* Finish up the current bindings, adding them into the
388 current function's statement tree. This is done by wrapping the
389 function's body in a COMPOUND_STMT containing these decls too. This
390 must be done _before_ finish_stmt_tree is called. If there is no
391 current function, we must be at file scope and no statements are
392 involved. Pop the previous bindings. */
395 finish_fname_decls ()
398 tree body = NULL_TREE;
399 tree stack = saved_function_name_decls;
401 for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack))
402 body = chainon (TREE_VALUE (stack), body);
406 /* They were called into existance, so add to statement tree. */
407 body = chainon (body,
408 TREE_CHAIN (DECL_SAVED_TREE (current_function_decl)));
409 body = build_stmt (COMPOUND_STMT, body);
411 COMPOUND_STMT_NO_SCOPE (body) = 1;
412 TREE_CHAIN (DECL_SAVED_TREE (current_function_decl)) = body;
415 for (ix = 0; fname_vars[ix].decl; ix++)
416 *fname_vars[ix].decl = NULL_TREE;
420 /* We had saved values, restore them. */
423 for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved))
425 tree decl = TREE_PURPOSE (saved);
426 unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved));
428 *fname_vars[ix].decl = decl;
430 stack = TREE_CHAIN (stack);
432 saved_function_name_decls = stack;
435 /* Return the text name of the current function, suitable prettified
439 fname_as_string (pretty_p)
442 const char *name = NULL;
445 name = (current_function_decl
446 ? (*decl_printable_name) (current_function_decl, 2)
448 else if (current_function_decl && DECL_NAME (current_function_decl))
449 name = IDENTIFIER_POINTER (DECL_NAME (current_function_decl));
455 /* Return the text name of the current function, formatted as
456 required by the supplied RID value. */
464 for (ix = 0; fname_vars[ix].decl; ix++)
465 if (fname_vars[ix].rid == rid)
467 return fname_as_string (fname_vars[ix].pretty);
470 /* Return the VAR_DECL for a const char array naming the current
471 function. If the VAR_DECL has not yet been created, create it
472 now. RID indicates how it should be formatted and IDENTIFIER_NODE
473 ID is its name (unfortunately C and C++ hold the RID values of
474 keywords in different places, so we can't derive RID from ID in
475 this language independant code. */
483 tree decl = NULL_TREE;
485 for (ix = 0; fname_vars[ix].decl; ix++)
486 if (fname_vars[ix].rid == rid)
489 decl = *fname_vars[ix].decl;
492 tree saved_last_tree = last_tree;
494 decl = (*make_fname_decl) (id, fname_vars[ix].pretty);
495 if (last_tree != saved_last_tree)
497 /* We created some statement tree for the decl. This belongs
498 at the start of the function, so remove it now and reinsert
499 it after the function is complete. */
500 tree stmts = TREE_CHAIN (saved_last_tree);
502 TREE_CHAIN (saved_last_tree) = NULL_TREE;
503 last_tree = saved_last_tree;
504 saved_function_name_decls = tree_cons (decl, stmts,
505 saved_function_name_decls);
507 *fname_vars[ix].decl = decl;
509 if (!ix && !current_function_decl)
510 pedwarn_with_decl (decl, "`%s' is not defined outside of function scope");
515 /* Given a chain of STRING_CST nodes,
516 concatenate them into one STRING_CST
517 and give it a suitable array-of-chars data type. */
520 combine_strings (strings)
523 register tree value, t;
524 register int length = 1;
527 int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
529 const int nchars_max = flag_isoc99 ? 4095 : 509;
531 if (TREE_CHAIN (strings))
533 /* More than one in the chain, so concatenate. */
534 register char *p, *q;
536 /* Don't include the \0 at the end of each substring,
537 except for the last one.
538 Count wide strings and ordinary strings separately. */
539 for (t = strings; t; t = TREE_CHAIN (t))
541 if (TREE_TYPE (t) == wchar_array_type_node)
543 wide_length += (TREE_STRING_LENGTH (t) - wchar_bytes);
547 length += (TREE_STRING_LENGTH (t) - 1);
550 /* If anything is wide, the non-wides will be converted,
551 which makes them take more space. */
553 length = length * wchar_bytes + wide_length;
557 /* Copy the individual strings into the new combined string.
558 If the combined string is wide, convert the chars to ints
559 for any individual strings that are not wide. */
562 for (t = strings; t; t = TREE_CHAIN (t))
564 int len = (TREE_STRING_LENGTH (t)
565 - ((TREE_TYPE (t) == wchar_array_type_node)
567 if ((TREE_TYPE (t) == wchar_array_type_node) == wide_flag)
569 memcpy (q, TREE_STRING_POINTER (t), len);
575 for (i = 0; i < len; i++)
577 if (BYTES_BIG_ENDIAN)
579 for (j=0; j<(WCHAR_TYPE_SIZE / BITS_PER_UNIT)-1; j++)
581 *q++ = TREE_STRING_POINTER (t)[i];
585 *q++ = TREE_STRING_POINTER (t)[i];
586 for (j=0; j<(WCHAR_TYPE_SIZE / BITS_PER_UNIT)-1; j++)
595 for (i = 0; i < wchar_bytes; i++)
601 value = build_string (length, p);
606 length = TREE_STRING_LENGTH (value);
607 if (TREE_TYPE (value) == wchar_array_type_node)
611 /* Compute the number of elements, for the array type. */
612 nchars = wide_flag ? length / wchar_bytes : length;
614 if (pedantic && nchars - 1 > nchars_max && c_language == clk_c)
615 pedwarn ("string length `%d' is greater than the length `%d' ISO C%d compilers are required to support",
616 nchars - 1, nchars_max, flag_isoc99 ? 99 : 89);
618 /* Create the array type for the string constant.
619 -Wwrite-strings says make the string constant an array of const char
620 so that copying it to a non-const pointer will get a warning.
621 For C++, this is the standard behavior. */
622 if (flag_const_strings
623 && (! flag_traditional && ! flag_writable_strings))
626 = build_type_variant (wide_flag ? wchar_type_node : char_type_node,
629 = build_array_type (elements,
630 build_index_type (build_int_2 (nchars - 1, 0)));
634 = build_array_type (wide_flag ? wchar_type_node : char_type_node,
635 build_index_type (build_int_2 (nchars - 1, 0)));
637 TREE_CONSTANT (value) = 1;
638 TREE_READONLY (value) = ! flag_writable_strings;
639 TREE_STATIC (value) = 1;
643 /* To speed up processing of attributes, we maintain an array of
644 IDENTIFIER_NODES and the corresponding attribute types. */
646 /* Array to hold attribute information. */
648 static struct {enum attrs id; tree name; int min, max, decl_req;} attrtab[50];
650 static int attrtab_idx = 0;
652 /* Add an entry to the attribute table above. */
655 add_attribute (id, string, min_len, max_len, decl_req)
658 int min_len, max_len;
663 attrtab[attrtab_idx].id = id;
664 attrtab[attrtab_idx].name = get_identifier (string);
665 attrtab[attrtab_idx].min = min_len;
666 attrtab[attrtab_idx].max = max_len;
667 attrtab[attrtab_idx++].decl_req = decl_req;
669 sprintf (buf, "__%s__", string);
671 attrtab[attrtab_idx].id = id;
672 attrtab[attrtab_idx].name = get_identifier (buf);
673 attrtab[attrtab_idx].min = min_len;
674 attrtab[attrtab_idx].max = max_len;
675 attrtab[attrtab_idx++].decl_req = decl_req;
678 /* Initialize attribute table. */
683 add_attribute (A_PACKED, "packed", 0, 0, 0);
684 add_attribute (A_NOCOMMON, "nocommon", 0, 0, 1);
685 add_attribute (A_COMMON, "common", 0, 0, 1);
686 add_attribute (A_NORETURN, "noreturn", 0, 0, 1);
687 add_attribute (A_NORETURN, "volatile", 0, 0, 1);
688 add_attribute (A_UNUSED, "unused", 0, 0, 0);
689 add_attribute (A_CONST, "const", 0, 0, 1);
690 add_attribute (A_T_UNION, "transparent_union", 0, 0, 0);
691 add_attribute (A_CONSTRUCTOR, "constructor", 0, 0, 1);
692 add_attribute (A_DESTRUCTOR, "destructor", 0, 0, 1);
693 add_attribute (A_MODE, "mode", 1, 1, 1);
694 add_attribute (A_SECTION, "section", 1, 1, 1);
695 add_attribute (A_ALIGNED, "aligned", 0, 1, 0);
696 add_attribute (A_FORMAT, "format", 3, 3, 1);
697 add_attribute (A_FORMAT_ARG, "format_arg", 1, 1, 1);
698 add_attribute (A_WEAK, "weak", 0, 0, 1);
699 add_attribute (A_ALIAS, "alias", 1, 1, 1);
700 add_attribute (A_NO_INSTRUMENT_FUNCTION, "no_instrument_function", 0, 0, 1);
701 add_attribute (A_NO_CHECK_MEMORY_USAGE, "no_check_memory_usage", 0, 0, 1);
702 add_attribute (A_MALLOC, "malloc", 0, 0, 1);
703 add_attribute (A_NO_LIMIT_STACK, "no_stack_limit", 0, 0, 1);
704 add_attribute (A_PURE, "pure", 0, 0, 1);
707 /* Default implementation of valid_lang_attribute, below. By default, there
708 are no language-specific attributes. */
711 default_valid_lang_attribute (attr_name, attr_args, decl, type)
712 tree attr_name ATTRIBUTE_UNUSED;
713 tree attr_args ATTRIBUTE_UNUSED;
714 tree decl ATTRIBUTE_UNUSED;
715 tree type ATTRIBUTE_UNUSED;
720 /* Return a 1 if ATTR_NAME and ATTR_ARGS denote a valid language-specific
721 attribute for either declaration DECL or type TYPE and 0 otherwise. */
723 int (*valid_lang_attribute) PARAMS ((tree, tree, tree, tree))
724 = default_valid_lang_attribute;
726 /* Process the attributes listed in ATTRIBUTES and install them in *NODE,
727 which is either a DECL (including a TYPE_DECL) or a TYPE. If a DECL,
728 it should be modified in place; if a TYPE, a copy should be created.
729 FLAGS gives further information, in the form of a bitwise OR of flags
730 in enum attribute_flags from c-common.h. Depending on these flags,
731 some attributes may be returned to be applied at a later stage (for
732 example, to apply a decl attribute to the declaration rather than to
736 decl_attributes (node, attributes, flags)
737 tree *node, attributes;
738 int flags ATTRIBUTE_UNUSED;
740 tree decl = 0, type = 0;
744 if (attrtab_idx == 0)
750 type = TREE_TYPE (decl);
751 is_type = TREE_CODE (*node) == TYPE_DECL;
753 else if (TYPE_P (*node))
754 type = *node, is_type = 1;
756 (*targetm.insert_attributes) (*node, &attributes);
758 for (a = attributes; a; a = TREE_CHAIN (a))
760 tree name = TREE_PURPOSE (a);
761 tree args = TREE_VALUE (a);
765 for (i = 0; i < attrtab_idx; i++)
766 if (attrtab[i].name == name)
769 if (i == attrtab_idx)
771 if (! valid_machine_attribute (name, args, decl, type)
772 && ! (* valid_lang_attribute) (name, args, decl, type))
773 warning ("`%s' attribute directive ignored",
774 IDENTIFIER_POINTER (name));
776 type = TREE_TYPE (decl);
779 else if (attrtab[i].decl_req && decl == 0)
781 warning ("`%s' attribute does not apply to types",
782 IDENTIFIER_POINTER (name));
785 else if (list_length (args) < attrtab[i].min
786 || list_length (args) > attrtab[i].max)
788 error ("wrong number of arguments specified for `%s' attribute",
789 IDENTIFIER_POINTER (name));
798 TYPE_PACKED (type) = 1;
799 else if (TREE_CODE (decl) == FIELD_DECL)
800 DECL_PACKED (decl) = 1;
801 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
802 used for DECL_REGISTER. It wouldn't mean anything anyway. */
804 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
808 if (TREE_CODE (decl) == VAR_DECL)
809 DECL_COMMON (decl) = 0;
811 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
815 if (TREE_CODE (decl) == VAR_DECL)
816 DECL_COMMON (decl) = 1;
818 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
822 if (TREE_CODE (decl) == FUNCTION_DECL)
823 TREE_THIS_VOLATILE (decl) = 1;
824 else if (TREE_CODE (type) == POINTER_TYPE
825 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
826 TREE_TYPE (decl) = type
828 (build_type_variant (TREE_TYPE (type),
829 TREE_READONLY (TREE_TYPE (type)), 1));
831 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
835 if (TREE_CODE (decl) == FUNCTION_DECL)
836 DECL_IS_MALLOC (decl) = 1;
837 /* ??? TODO: Support types. */
839 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
845 TREE_USED (decl) = 1;
847 TREE_USED (type) = 1;
848 else if (TREE_CODE (decl) == PARM_DECL
849 || TREE_CODE (decl) == VAR_DECL
850 || TREE_CODE (decl) == FUNCTION_DECL
851 || TREE_CODE (decl) == LABEL_DECL)
852 TREE_USED (decl) = 1;
854 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
858 if (TREE_CODE (decl) == FUNCTION_DECL)
859 TREE_READONLY (decl) = 1;
860 else if (TREE_CODE (type) == POINTER_TYPE
861 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
862 TREE_TYPE (decl) = type
864 (build_type_variant (TREE_TYPE (type), 1,
865 TREE_THIS_VOLATILE (TREE_TYPE (type))));
867 warning ( "`%s' attribute ignored", IDENTIFIER_POINTER (name));
871 if (TREE_CODE (decl) == FUNCTION_DECL)
872 DECL_IS_PURE (decl) = 1;
873 /* ??? TODO: Support types. */
875 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
881 && TREE_CODE (type) == UNION_TYPE
883 || (TYPE_FIELDS (type) != 0
884 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))))
885 TYPE_TRANSPARENT_UNION (type) = 1;
886 else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
887 && TREE_CODE (type) == UNION_TYPE
888 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))
889 DECL_TRANSPARENT_UNION (decl) = 1;
891 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
895 if (TREE_CODE (decl) == FUNCTION_DECL
896 && TREE_CODE (type) == FUNCTION_TYPE
897 && decl_function_context (decl) == 0)
899 DECL_STATIC_CONSTRUCTOR (decl) = 1;
900 TREE_USED (decl) = 1;
903 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
907 if (TREE_CODE (decl) == FUNCTION_DECL
908 && TREE_CODE (type) == FUNCTION_TYPE
909 && decl_function_context (decl) == 0)
911 DECL_STATIC_DESTRUCTOR (decl) = 1;
912 TREE_USED (decl) = 1;
915 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
919 if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE)
920 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
924 const char *p = IDENTIFIER_POINTER (TREE_VALUE (args));
925 int len = strlen (p);
926 enum machine_mode mode = VOIDmode;
929 if (len > 4 && p[0] == '_' && p[1] == '_'
930 && p[len - 1] == '_' && p[len - 2] == '_')
932 char *newp = (char *) alloca (len - 1);
934 strcpy (newp, &p[2]);
935 newp[len - 4] = '\0';
939 /* Give this decl a type with the specified mode.
940 First check for the special modes. */
941 if (! strcmp (p, "byte"))
943 else if (!strcmp (p, "word"))
945 else if (! strcmp (p, "pointer"))
948 for (j = 0; j < NUM_MACHINE_MODES; j++)
949 if (!strcmp (p, GET_MODE_NAME (j)))
950 mode = (enum machine_mode) j;
952 if (mode == VOIDmode)
953 error ("unknown machine mode `%s'", p);
954 else if (0 == (typefm = type_for_mode (mode,
955 TREE_UNSIGNED (type))))
956 error ("no data type for mode `%s'", p);
959 if (TYPE_PRECISION (typefm) > (TREE_UNSIGNED (type)
960 ? TYPE_PRECISION(uintmax_type_node)
961 : TYPE_PRECISION(intmax_type_node))
963 pedwarn ("type with more precision than %s",
964 TREE_UNSIGNED (type) ? "uintmax_t" : "intmax_t");
965 TREE_TYPE (decl) = type = typefm;
966 DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0;
967 if (TREE_CODE (decl) != FIELD_DECL)
968 layout_decl (decl, 0);
974 if (targetm.have_named_sections)
976 if ((TREE_CODE (decl) == FUNCTION_DECL
977 || TREE_CODE (decl) == VAR_DECL)
978 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
980 if (TREE_CODE (decl) == VAR_DECL
981 && current_function_decl != NULL_TREE
982 && ! TREE_STATIC (decl))
983 error_with_decl (decl,
984 "section attribute cannot be specified for local variables");
985 /* The decl may have already been given a section attribute
986 from a previous declaration. Ensure they match. */
987 else if (DECL_SECTION_NAME (decl) != NULL_TREE
988 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
989 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
990 error_with_decl (*node,
991 "section of `%s' conflicts with previous declaration");
993 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
996 error_with_decl (*node,
997 "section attribute not allowed for `%s'");
1000 error_with_decl (*node,
1001 "section attributes are not supported for this target");
1007 = (args ? TREE_VALUE (args)
1008 : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1011 /* Strip any NOPs of any kind. */
1012 while (TREE_CODE (align_expr) == NOP_EXPR
1013 || TREE_CODE (align_expr) == CONVERT_EXPR
1014 || TREE_CODE (align_expr) == NON_LVALUE_EXPR)
1015 align_expr = TREE_OPERAND (align_expr, 0);
1017 if (TREE_CODE (align_expr) != INTEGER_CST)
1019 error ("requested alignment is not a constant");
1023 if ((i = tree_log2 (align_expr)) == -1)
1024 error ("requested alignment is not a power of 2");
1025 else if (i > HOST_BITS_PER_INT - 2)
1026 error ("requested alignment is too large");
1029 /* If we have a TYPE_DECL, then copy the type, so that we
1030 don't accidentally modify a builtin type. See pushdecl. */
1031 if (decl && TREE_TYPE (decl) != error_mark_node
1032 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
1034 tree tt = TREE_TYPE (decl);
1035 DECL_ORIGINAL_TYPE (decl) = tt;
1036 tt = build_type_copy (tt);
1037 TYPE_NAME (tt) = decl;
1038 TREE_USED (tt) = TREE_USED (decl);
1039 TREE_TYPE (decl) = tt;
1043 TYPE_ALIGN (type) = (1 << i) * BITS_PER_UNIT;
1044 TYPE_USER_ALIGN (type) = 1;
1046 else if (TREE_CODE (decl) != VAR_DECL
1047 && TREE_CODE (decl) != FIELD_DECL)
1048 error_with_decl (decl,
1049 "alignment may not be specified for `%s'");
1052 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
1053 DECL_USER_ALIGN (decl) = 1;
1059 decl_handle_format_attribute (decl, args);
1063 decl_handle_format_arg_attribute (decl, args);
1067 declare_weak (decl);
1071 if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
1072 || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl)))
1073 error_with_decl (decl,
1074 "`%s' defined both normally and as an alias");
1075 else if (decl_function_context (decl) == 0)
1079 id = TREE_VALUE (args);
1080 if (TREE_CODE (id) != STRING_CST)
1082 error ("alias arg not a string");
1085 id = get_identifier (TREE_STRING_POINTER (id));
1086 /* This counts as a use of the object pointed to. */
1089 if (TREE_CODE (decl) == FUNCTION_DECL)
1090 DECL_INITIAL (decl) = error_mark_node;
1092 DECL_EXTERNAL (decl) = 0;
1093 assemble_alias (decl, id);
1096 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
1099 case A_NO_CHECK_MEMORY_USAGE:
1100 if (TREE_CODE (decl) != FUNCTION_DECL)
1102 error_with_decl (decl,
1103 "`%s' attribute applies only to functions",
1104 IDENTIFIER_POINTER (name));
1106 else if (DECL_INITIAL (decl))
1108 error_with_decl (decl,
1109 "can't set `%s' attribute after definition",
1110 IDENTIFIER_POINTER (name));
1113 DECL_NO_CHECK_MEMORY_USAGE (decl) = 1;
1116 case A_NO_INSTRUMENT_FUNCTION:
1117 if (TREE_CODE (decl) != FUNCTION_DECL)
1119 error_with_decl (decl,
1120 "`%s' attribute applies only to functions",
1121 IDENTIFIER_POINTER (name));
1123 else if (DECL_INITIAL (decl))
1125 error_with_decl (decl,
1126 "can't set `%s' attribute after definition",
1127 IDENTIFIER_POINTER (name));
1130 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
1133 case A_NO_LIMIT_STACK:
1134 if (TREE_CODE (decl) != FUNCTION_DECL)
1136 error_with_decl (decl,
1137 "`%s' attribute applies only to functions",
1138 IDENTIFIER_POINTER (name));
1140 else if (DECL_INITIAL (decl))
1142 error_with_decl (decl,
1143 "can't set `%s' attribute after definition",
1144 IDENTIFIER_POINTER (name));
1147 DECL_NO_LIMIT_STACK (decl) = 1;
1154 /* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two
1155 lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE).
1157 The head of the declspec list is stored in DECLSPECS.
1158 The head of the attribute list is stored in PREFIX_ATTRIBUTES.
1160 Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of
1161 the list elements. We drop the containing TREE_LIST nodes and link the
1162 resulting attributes together the way decl_attributes expects them. */
1165 split_specs_attrs (specs_attrs, declspecs, prefix_attributes)
1167 tree *declspecs, *prefix_attributes;
1169 tree t, s, a, next, specs, attrs;
1171 /* This can happen after an __extension__ in pedantic mode. */
1172 if (specs_attrs != NULL_TREE
1173 && TREE_CODE (specs_attrs) == INTEGER_CST)
1175 *declspecs = NULL_TREE;
1176 *prefix_attributes = NULL_TREE;
1180 /* This can happen in c++ (eg: decl: typespec initdecls ';'). */
1181 if (specs_attrs != NULL_TREE
1182 && TREE_CODE (specs_attrs) != TREE_LIST)
1184 *declspecs = specs_attrs;
1185 *prefix_attributes = NULL_TREE;
1189 /* Remember to keep the lists in the same order, element-wise. */
1191 specs = s = NULL_TREE;
1192 attrs = a = NULL_TREE;
1193 for (t = specs_attrs; t; t = next)
1195 next = TREE_CHAIN (t);
1196 /* Declspecs have a non-NULL TREE_VALUE. */
1197 if (TREE_VALUE (t) != NULL_TREE)
1199 if (specs == NULL_TREE)
1209 if (attrs == NULL_TREE)
1210 attrs = a = TREE_PURPOSE (t);
1213 TREE_CHAIN (a) = TREE_PURPOSE (t);
1214 a = TREE_PURPOSE (t);
1216 /* More attrs can be linked here, move A to the end. */
1217 while (TREE_CHAIN (a) != NULL_TREE)
1222 /* Terminate the lists. */
1224 TREE_CHAIN (s) = NULL_TREE;
1226 TREE_CHAIN (a) = NULL_TREE;
1230 *prefix_attributes = attrs;
1233 /* Strip attributes from SPECS_ATTRS, a list of declspecs and attributes.
1234 This function is used by the parser when a rule will accept attributes
1235 in a particular position, but we don't want to support that just yet.
1237 A warning is issued for every ignored attribute. */
1240 strip_attrs (specs_attrs)
1245 split_specs_attrs (specs_attrs, &specs, &attrs);
1249 warning ("`%s' attribute ignored",
1250 IDENTIFIER_POINTER (TREE_PURPOSE (attrs)));
1251 attrs = TREE_CHAIN (attrs);
1257 static int is_valid_printf_arglist PARAMS ((tree));
1258 static rtx c_expand_builtin PARAMS ((tree, rtx, enum machine_mode, enum expand_modifier));
1259 static rtx c_expand_builtin_printf PARAMS ((tree, rtx, enum machine_mode,
1260 enum expand_modifier, int));
1261 static rtx c_expand_builtin_fprintf PARAMS ((tree, rtx, enum machine_mode,
1262 enum expand_modifier, int));
1264 /* Print a warning if a constant expression had overflow in folding.
1265 Invoke this function on every expression that the language
1266 requires to be a constant expression.
1267 Note the ANSI C standard says it is erroneous for a
1268 constant expression to overflow. */
1271 constant_expression_warning (value)
1274 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
1275 || TREE_CODE (value) == COMPLEX_CST)
1276 && TREE_CONSTANT_OVERFLOW (value) && pedantic)
1277 pedwarn ("overflow in constant expression");
1280 /* Print a warning if an expression had overflow in folding.
1281 Invoke this function on every expression that
1282 (1) appears in the source code, and
1283 (2) might be a constant expression that overflowed, and
1284 (3) is not already checked by convert_and_check;
1285 however, do not invoke this function on operands of explicit casts. */
1288 overflow_warning (value)
1291 if ((TREE_CODE (value) == INTEGER_CST
1292 || (TREE_CODE (value) == COMPLEX_CST
1293 && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST))
1294 && TREE_OVERFLOW (value))
1296 TREE_OVERFLOW (value) = 0;
1297 if (skip_evaluation == 0)
1298 warning ("integer overflow in expression");
1300 else if ((TREE_CODE (value) == REAL_CST
1301 || (TREE_CODE (value) == COMPLEX_CST
1302 && TREE_CODE (TREE_REALPART (value)) == REAL_CST))
1303 && TREE_OVERFLOW (value))
1305 TREE_OVERFLOW (value) = 0;
1306 if (skip_evaluation == 0)
1307 warning ("floating point overflow in expression");
1311 /* Print a warning if a large constant is truncated to unsigned,
1312 or if -Wconversion is used and a constant < 0 is converted to unsigned.
1313 Invoke this function on every expression that might be implicitly
1314 converted to an unsigned type. */
1317 unsigned_conversion_warning (result, operand)
1318 tree result, operand;
1320 if (TREE_CODE (operand) == INTEGER_CST
1321 && TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE
1322 && TREE_UNSIGNED (TREE_TYPE (result))
1323 && skip_evaluation == 0
1324 && !int_fits_type_p (operand, TREE_TYPE (result)))
1326 if (!int_fits_type_p (operand, signed_type (TREE_TYPE (result))))
1327 /* This detects cases like converting -129 or 256 to unsigned char. */
1328 warning ("large integer implicitly truncated to unsigned type");
1329 else if (warn_conversion)
1330 warning ("negative integer implicitly converted to unsigned type");
1334 /* Nonzero if constant C has a value that is permissible
1335 for type TYPE (an INTEGER_TYPE). */
1338 constant_fits_type_p (c, type)
1341 if (TREE_CODE (c) == INTEGER_CST)
1342 return int_fits_type_p (c, type);
1344 c = convert (type, c);
1345 return !TREE_OVERFLOW (c);
1348 /* Convert EXPR to TYPE, warning about conversion problems with constants.
1349 Invoke this function on every expression that is converted implicitly,
1350 i.e. because of language rules and not because of an explicit cast. */
1353 convert_and_check (type, expr)
1356 tree t = convert (type, expr);
1357 if (TREE_CODE (t) == INTEGER_CST)
1359 if (TREE_OVERFLOW (t))
1361 TREE_OVERFLOW (t) = 0;
1363 /* Do not diagnose overflow in a constant expression merely
1364 because a conversion overflowed. */
1365 TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr);
1367 /* No warning for converting 0x80000000 to int. */
1368 if (!(TREE_UNSIGNED (type) < TREE_UNSIGNED (TREE_TYPE (expr))
1369 && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
1370 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
1371 /* If EXPR fits in the unsigned version of TYPE,
1372 don't warn unless pedantic. */
1374 || TREE_UNSIGNED (type)
1375 || ! constant_fits_type_p (expr, unsigned_type (type)))
1376 && skip_evaluation == 0)
1377 warning ("overflow in implicit constant conversion");
1380 unsigned_conversion_warning (t, expr);
1385 /* A node in a list that describes references to variables (EXPR), which are
1386 either read accesses if WRITER is zero, or write accesses, in which case
1387 WRITER is the parent of EXPR. */
1394 /* Used to implement a cache the results of a call to verify_tree. We only
1395 use this for SAVE_EXPRs. */
1398 struct tlist_cache *next;
1399 struct tlist *cache_before_sp;
1400 struct tlist *cache_after_sp;
1404 /* Obstack to use when allocating tlist structures, and corresponding
1406 static struct obstack tlist_obstack;
1407 static char *tlist_firstobj = 0;
1409 /* Keep track of the identifiers we've warned about, so we can avoid duplicate
1411 static struct tlist *warned_ids;
1412 /* SAVE_EXPRs need special treatment. We process them only once and then
1413 cache the results. */
1414 static struct tlist_cache *save_expr_cache;
1416 static void add_tlist PARAMS ((struct tlist **, struct tlist *, tree, int));
1417 static void merge_tlist PARAMS ((struct tlist **, struct tlist *, int));
1418 static void verify_tree PARAMS ((tree, struct tlist **, struct tlist **, tree));
1419 static int warning_candidate_p PARAMS ((tree));
1420 static void warn_for_collisions PARAMS ((struct tlist *));
1421 static void warn_for_collisions_1 PARAMS ((tree, tree, struct tlist *, int));
1422 static struct tlist *new_tlist PARAMS ((struct tlist *, tree, tree));
1423 static void verify_sequence_points PARAMS ((tree));
1425 /* Create a new struct tlist and fill in its fields. */
1426 static struct tlist *
1427 new_tlist (next, t, writer)
1433 l = (struct tlist *) obstack_alloc (&tlist_obstack, sizeof *l);
1440 /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER
1441 is nonnull, we ignore any node we find which has a writer equal to it. */
1444 add_tlist (to, add, exclude_writer, copy)
1447 tree exclude_writer;
1452 struct tlist *next = add->next;
1455 if (! exclude_writer || add->writer != exclude_writer)
1456 *to = copy ? new_tlist (*to, add->expr, add->writer) : add;
1461 /* Merge the nodes of ADD into TO. This merging process is done so that for
1462 each variable that already exists in TO, no new node is added; however if
1463 there is a write access recorded in ADD, and an occurrence on TO is only
1464 a read access, then the occurrence in TO will be modified to record the
1468 merge_tlist (to, add, copy)
1473 struct tlist **end = to;
1476 end = &(*end)->next;
1482 struct tlist *next = add->next;
1484 for (tmp2 = *to; tmp2; tmp2 = tmp2->next)
1485 if (tmp2->expr == add->expr)
1489 tmp2->writer = add->writer;
1493 *end = copy ? add : new_tlist (NULL, add->expr, add->writer);
1494 end = &(*end)->next;
1501 /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable
1502 references in list LIST conflict with it, excluding reads if ONLY writers
1506 warn_for_collisions_1 (written, writer, list, only_writes)
1507 tree written, writer;
1513 /* Avoid duplicate warnings. */
1514 for (tmp = warned_ids; tmp; tmp = tmp->next)
1515 if (tmp->expr == written)
1520 if (list->expr == written
1521 && list->writer != writer
1522 && (! only_writes || list->writer))
1524 warned_ids = new_tlist (warned_ids, written, NULL_TREE);
1525 warning ("operation on `%s' may be undefined",
1526 IDENTIFIER_POINTER (DECL_NAME (list->expr)));
1532 /* Given a list LIST of references to variables, find whether any of these
1533 can cause conflicts due to missing sequence points. */
1536 warn_for_collisions (list)
1541 for (tmp = list; tmp; tmp = tmp->next)
1544 warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0);
1548 /* Return nonzero if X is a tree that can be verified by the sequence poitn
1551 warning_candidate_p (x)
1554 return TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == PARM_DECL;
1557 /* Walk the tree X, and record accesses to variables. If X is written by the
1558 parent tree, WRITER is the parent.
1559 We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this
1560 expression or its only operand forces a sequence point, then everything up
1561 to the sequence point is stored in PBEFORE_SP. Everything else gets stored
1563 Once we return, we will have emitted warnings if any subexpression before
1564 such a sequence point could be undefined. On a higher level, however, the
1565 sequence point may not be relevant, and we'll merge the two lists.
1567 Example: (b++, a) + b;
1568 The call that processes the COMPOUND_EXPR will store the increment of B
1569 in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that
1570 processes the PLUS_EXPR will need to merge the two lists so that
1571 eventually, all accesses end up on the same list (and we'll warn about the
1572 unordered subexpressions b++ and b.
1574 A note on merging. If we modify the former example so that our expression
1577 care must be taken not simply to add all three expressions into the final
1578 PNO_SP list. The function merge_tlist takes care of that by merging the
1579 before-SP list of the COMPOUND_EXPR into its after-SP list in a special
1580 way, so that no more than one access to B is recorded. */
1583 verify_tree (x, pbefore_sp, pno_sp, writer)
1585 struct tlist **pbefore_sp, **pno_sp;
1588 struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3;
1589 enum tree_code code;
1592 /* X may be NULL if it is the operand of an empty statement expression
1598 code = TREE_CODE (x);
1599 class = TREE_CODE_CLASS (code);
1601 if (warning_candidate_p (x))
1603 *pno_sp = new_tlist (*pno_sp, x, writer);
1613 case TRUTH_ANDIF_EXPR:
1614 case TRUTH_ORIF_EXPR:
1615 tmp_before = tmp_nosp = tmp_list3 = 0;
1616 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
1617 warn_for_collisions (tmp_nosp);
1618 merge_tlist (pbefore_sp, tmp_before, 0);
1619 merge_tlist (pbefore_sp, tmp_nosp, 0);
1620 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE);
1621 merge_tlist (pbefore_sp, tmp_list3, 0);
1625 tmp_before = tmp_list2 = 0;
1626 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE);
1627 warn_for_collisions (tmp_list2);
1628 merge_tlist (pbefore_sp, tmp_before, 0);
1629 merge_tlist (pbefore_sp, tmp_list2, 1);
1631 tmp_list3 = tmp_nosp = 0;
1632 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE);
1633 warn_for_collisions (tmp_nosp);
1634 merge_tlist (pbefore_sp, tmp_list3, 0);
1636 tmp_list3 = tmp_list2 = 0;
1637 verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE);
1638 warn_for_collisions (tmp_list2);
1639 merge_tlist (pbefore_sp, tmp_list3, 0);
1640 /* Rather than add both tmp_nosp and tmp_list2, we have to merge the
1641 two first, to avoid warning for (a ? b++ : b++). */
1642 merge_tlist (&tmp_nosp, tmp_list2, 0);
1643 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
1646 case PREDECREMENT_EXPR:
1647 case PREINCREMENT_EXPR:
1648 case POSTDECREMENT_EXPR:
1649 case POSTINCREMENT_EXPR:
1650 verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x);
1654 tmp_before = tmp_nosp = tmp_list3 = 0;
1655 verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE);
1656 verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x);
1657 /* Expressions inside the LHS are not ordered wrt. the sequence points
1658 in the RHS. Example:
1660 Despite the fact that the modification of "a" is in the before_sp
1661 list (tmp_before), it conflicts with the use of "a" in the LHS.
1662 We can handle this by adding the contents of tmp_list3
1663 to those of tmp_before, and redoing the collision warnings for that
1665 add_tlist (&tmp_before, tmp_list3, x, 1);
1666 warn_for_collisions (tmp_before);
1667 /* Exclude the LHS itself here; we first have to merge it into the
1668 tmp_nosp list. This is done to avoid warning for "a = a"; if we
1669 didn't exclude the LHS, we'd get it twice, once as a read and once
1671 add_tlist (pno_sp, tmp_list3, x, 0);
1672 warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1);
1674 merge_tlist (pbefore_sp, tmp_before, 0);
1675 if (warning_candidate_p (TREE_OPERAND (x, 0)))
1676 merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0);
1677 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1);
1681 /* We need to warn about conflicts among arguments and conflicts between
1682 args and the function address. Side effects of the function address,
1683 however, are not ordered by the sequence point of the call. */
1684 tmp_before = tmp_nosp = tmp_list2 = tmp_list3 = 0;
1685 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
1686 if (TREE_OPERAND (x, 1))
1687 verify_tree (TREE_OPERAND (x, 1), &tmp_list2, &tmp_list3, NULL_TREE);
1688 merge_tlist (&tmp_list3, tmp_list2, 0);
1689 add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0);
1690 add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0);
1691 warn_for_collisions (tmp_before);
1692 add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0);
1696 /* Scan all the list, e.g. indices of multi dimensional array. */
1699 tmp_before = tmp_nosp = 0;
1700 verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE);
1701 merge_tlist (&tmp_nosp, tmp_before, 0);
1702 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
1709 struct tlist_cache *t;
1710 for (t = save_expr_cache; t; t = t->next)
1716 t = (struct tlist_cache *) obstack_alloc (&tlist_obstack,
1718 t->next = save_expr_cache;
1720 save_expr_cache = t;
1722 tmp_before = tmp_nosp = 0;
1723 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
1724 warn_for_collisions (tmp_nosp);
1729 struct tlist *t = tmp_nosp;
1731 merge_tlist (&tmp_list3, t, 0);
1733 t->cache_before_sp = tmp_before;
1734 t->cache_after_sp = tmp_list3;
1736 merge_tlist (pbefore_sp, t->cache_before_sp, 1);
1737 add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1);
1746 if (first_rtl_op (code) == 0)
1748 x = TREE_OPERAND (x, 0);
1764 int max = first_rtl_op (TREE_CODE (x));
1765 for (lp = 0; lp < max; lp++)
1767 tmp_before = tmp_nosp = 0;
1768 verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, NULL_TREE);
1769 merge_tlist (&tmp_nosp, tmp_before, 0);
1770 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
1777 /* Try to warn for undefined behaviour in EXPR due to missing sequence
1781 verify_sequence_points (expr)
1784 struct tlist *before_sp = 0, *after_sp = 0;
1787 save_expr_cache = 0;
1788 if (tlist_firstobj == 0)
1790 gcc_obstack_init (&tlist_obstack);
1791 tlist_firstobj = obstack_alloc (&tlist_obstack, 0);
1794 verify_tree (expr, &before_sp, &after_sp, 0);
1795 warn_for_collisions (after_sp);
1796 obstack_free (&tlist_obstack, tlist_firstobj);
1800 c_expand_expr_stmt (expr)
1803 /* Do default conversion if safe and possibly important,
1804 in case within ({...}). */
1805 if ((TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE && lvalue_p (expr))
1806 || TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE)
1807 expr = default_conversion (expr);
1809 if (warn_sequence_point)
1810 verify_sequence_points (expr);
1812 if (TREE_TYPE (expr) != error_mark_node
1813 && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr))
1814 && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
1815 error ("expression statement has incomplete type");
1817 last_expr_type = TREE_TYPE (expr);
1818 return add_stmt (build_stmt (EXPR_STMT, expr));
1821 /* Validate the expression after `case' and apply default promotions. */
1824 check_case_value (value)
1827 if (value == NULL_TREE)
1830 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
1831 STRIP_TYPE_NOPS (value);
1832 /* In C++, the following is allowed:
1835 switch (...) { case i: ... }
1837 So, we try to reduce the VALUE to a constant that way. */
1838 if (c_language == clk_cplusplus)
1840 value = decl_constant_value (value);
1841 STRIP_TYPE_NOPS (value);
1842 value = fold (value);
1845 if (TREE_CODE (value) != INTEGER_CST
1846 && value != error_mark_node)
1848 error ("case label does not reduce to an integer constant");
1849 value = error_mark_node;
1852 /* Promote char or short to int. */
1853 value = default_conversion (value);
1855 constant_expression_warning (value);
1860 /* Return an integer type with BITS bits of precision,
1861 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
1864 type_for_size (bits, unsignedp)
1868 if (bits == TYPE_PRECISION (integer_type_node))
1869 return unsignedp ? unsigned_type_node : integer_type_node;
1871 if (bits == TYPE_PRECISION (signed_char_type_node))
1872 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
1874 if (bits == TYPE_PRECISION (short_integer_type_node))
1875 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
1877 if (bits == TYPE_PRECISION (long_integer_type_node))
1878 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
1880 if (bits == TYPE_PRECISION (long_long_integer_type_node))
1881 return (unsignedp ? long_long_unsigned_type_node
1882 : long_long_integer_type_node);
1884 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
1885 return (unsignedp ? widest_unsigned_literal_type_node
1886 : widest_integer_literal_type_node);
1888 if (bits <= TYPE_PRECISION (intQI_type_node))
1889 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
1891 if (bits <= TYPE_PRECISION (intHI_type_node))
1892 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
1894 if (bits <= TYPE_PRECISION (intSI_type_node))
1895 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
1897 if (bits <= TYPE_PRECISION (intDI_type_node))
1898 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
1903 /* Return a data type that has machine mode MODE.
1904 If the mode is an integer,
1905 then UNSIGNEDP selects between signed and unsigned types. */
1908 type_for_mode (mode, unsignedp)
1909 enum machine_mode mode;
1912 if (mode == TYPE_MODE (integer_type_node))
1913 return unsignedp ? unsigned_type_node : integer_type_node;
1915 if (mode == TYPE_MODE (signed_char_type_node))
1916 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
1918 if (mode == TYPE_MODE (short_integer_type_node))
1919 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
1921 if (mode == TYPE_MODE (long_integer_type_node))
1922 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
1924 if (mode == TYPE_MODE (long_long_integer_type_node))
1925 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
1927 if (mode == TYPE_MODE (widest_integer_literal_type_node))
1928 return unsignedp ? widest_unsigned_literal_type_node
1929 : widest_integer_literal_type_node;
1931 if (mode == TYPE_MODE (intQI_type_node))
1932 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
1934 if (mode == TYPE_MODE (intHI_type_node))
1935 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
1937 if (mode == TYPE_MODE (intSI_type_node))
1938 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
1940 if (mode == TYPE_MODE (intDI_type_node))
1941 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
1943 #if HOST_BITS_PER_WIDE_INT >= 64
1944 if (mode == TYPE_MODE (intTI_type_node))
1945 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
1948 if (mode == TYPE_MODE (float_type_node))
1949 return float_type_node;
1951 if (mode == TYPE_MODE (double_type_node))
1952 return double_type_node;
1954 if (mode == TYPE_MODE (long_double_type_node))
1955 return long_double_type_node;
1957 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
1958 return build_pointer_type (char_type_node);
1960 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
1961 return build_pointer_type (integer_type_node);
1963 #ifdef VECTOR_MODE_SUPPORTED_P
1964 if (mode == TYPE_MODE (V4SF_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
1965 return V4SF_type_node;
1966 if (mode == TYPE_MODE (V4SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
1967 return V4SI_type_node;
1968 if (mode == TYPE_MODE (V2SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
1969 return V2SI_type_node;
1970 if (mode == TYPE_MODE (V4HI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
1971 return V4HI_type_node;
1972 if (mode == TYPE_MODE (V8QI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
1973 return V8QI_type_node;
1979 /* Return an unsigned type the same as TYPE in other respects. */
1981 unsigned_type (type)
1984 tree type1 = TYPE_MAIN_VARIANT (type);
1985 if (type1 == signed_char_type_node || type1 == char_type_node)
1986 return unsigned_char_type_node;
1987 if (type1 == integer_type_node)
1988 return unsigned_type_node;
1989 if (type1 == short_integer_type_node)
1990 return short_unsigned_type_node;
1991 if (type1 == long_integer_type_node)
1992 return long_unsigned_type_node;
1993 if (type1 == long_long_integer_type_node)
1994 return long_long_unsigned_type_node;
1995 if (type1 == widest_integer_literal_type_node)
1996 return widest_unsigned_literal_type_node;
1997 #if HOST_BITS_PER_WIDE_INT >= 64
1998 if (type1 == intTI_type_node)
1999 return unsigned_intTI_type_node;
2001 if (type1 == intDI_type_node)
2002 return unsigned_intDI_type_node;
2003 if (type1 == intSI_type_node)
2004 return unsigned_intSI_type_node;
2005 if (type1 == intHI_type_node)
2006 return unsigned_intHI_type_node;
2007 if (type1 == intQI_type_node)
2008 return unsigned_intQI_type_node;
2010 return signed_or_unsigned_type (1, type);
2013 /* Return a signed type the same as TYPE in other respects. */
2019 tree type1 = TYPE_MAIN_VARIANT (type);
2020 if (type1 == unsigned_char_type_node || type1 == char_type_node)
2021 return signed_char_type_node;
2022 if (type1 == unsigned_type_node)
2023 return integer_type_node;
2024 if (type1 == short_unsigned_type_node)
2025 return short_integer_type_node;
2026 if (type1 == long_unsigned_type_node)
2027 return long_integer_type_node;
2028 if (type1 == long_long_unsigned_type_node)
2029 return long_long_integer_type_node;
2030 if (type1 == widest_unsigned_literal_type_node)
2031 return widest_integer_literal_type_node;
2032 #if HOST_BITS_PER_WIDE_INT >= 64
2033 if (type1 == unsigned_intTI_type_node)
2034 return intTI_type_node;
2036 if (type1 == unsigned_intDI_type_node)
2037 return intDI_type_node;
2038 if (type1 == unsigned_intSI_type_node)
2039 return intSI_type_node;
2040 if (type1 == unsigned_intHI_type_node)
2041 return intHI_type_node;
2042 if (type1 == unsigned_intQI_type_node)
2043 return intQI_type_node;
2045 return signed_or_unsigned_type (0, type);
2048 /* Return a type the same as TYPE except unsigned or
2049 signed according to UNSIGNEDP. */
2052 signed_or_unsigned_type (unsignedp, type)
2056 if (! INTEGRAL_TYPE_P (type)
2057 || TREE_UNSIGNED (type) == unsignedp)
2060 if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node))
2061 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2062 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
2063 return unsignedp ? unsigned_type_node : integer_type_node;
2064 if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node))
2065 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2066 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node))
2067 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2068 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node))
2069 return (unsignedp ? long_long_unsigned_type_node
2070 : long_long_integer_type_node);
2071 if (TYPE_PRECISION (type) == TYPE_PRECISION (widest_integer_literal_type_node))
2072 return (unsignedp ? widest_unsigned_literal_type_node
2073 : widest_integer_literal_type_node);
2075 #if HOST_BITS_PER_WIDE_INT >= 64
2076 if (TYPE_PRECISION (type) == TYPE_PRECISION (intTI_type_node))
2077 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
2079 if (TYPE_PRECISION (type) == TYPE_PRECISION (intDI_type_node))
2080 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2081 if (TYPE_PRECISION (type) == TYPE_PRECISION (intSI_type_node))
2082 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2083 if (TYPE_PRECISION (type) == TYPE_PRECISION (intHI_type_node))
2084 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2085 if (TYPE_PRECISION (type) == TYPE_PRECISION (intQI_type_node))
2086 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2091 /* Return the minimum number of bits needed to represent VALUE in a
2092 signed or unsigned type, UNSIGNEDP says which. */
2095 min_precision (value, unsignedp)
2101 /* If the value is negative, compute its negative minus 1. The latter
2102 adjustment is because the absolute value of the largest negative value
2103 is one larger than the largest positive value. This is equivalent to
2104 a bit-wise negation, so use that operation instead. */
2106 if (tree_int_cst_sgn (value) < 0)
2107 value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value));
2109 /* Return the number of bits needed, taking into account the fact
2110 that we need one more bit for a signed than unsigned type. */
2112 if (integer_zerop (value))
2115 log = tree_floor_log2 (value);
2117 return log + 1 + ! unsignedp;
2120 /* Print an error message for invalid operands to arith operation CODE.
2121 NOP_EXPR is used as a special case (see truthvalue_conversion). */
2124 binary_op_error (code)
2125 enum tree_code code;
2127 register const char *opname;
2132 error ("invalid truth-value expression");
2136 opname = "+"; break;
2138 opname = "-"; break;
2140 opname = "*"; break;
2142 opname = "max"; break;
2144 opname = "min"; break;
2146 opname = "=="; break;
2148 opname = "!="; break;
2150 opname = "<="; break;
2152 opname = ">="; break;
2154 opname = "<"; break;
2156 opname = ">"; break;
2158 opname = "<<"; break;
2160 opname = ">>"; break;
2161 case TRUNC_MOD_EXPR:
2162 case FLOOR_MOD_EXPR:
2163 opname = "%"; break;
2164 case TRUNC_DIV_EXPR:
2165 case FLOOR_DIV_EXPR:
2166 opname = "/"; break;
2168 opname = "&"; break;
2170 opname = "|"; break;
2171 case TRUTH_ANDIF_EXPR:
2172 opname = "&&"; break;
2173 case TRUTH_ORIF_EXPR:
2174 opname = "||"; break;
2176 opname = "^"; break;
2179 opname = "rotate"; break;
2181 opname = "unknown"; break;
2183 error ("invalid operands to binary %s", opname);
2186 /* Subroutine of build_binary_op, used for comparison operations.
2187 See if the operands have both been converted from subword integer types
2188 and, if so, perhaps change them both back to their original type.
2189 This function is also responsible for converting the two operands
2190 to the proper common type for comparison.
2192 The arguments of this function are all pointers to local variables
2193 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
2194 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
2196 If this function returns nonzero, it means that the comparison has
2197 a constant value. What this function returns is an expression for
2201 shorten_compare (op0_ptr, op1_ptr, restype_ptr, rescode_ptr)
2202 tree *op0_ptr, *op1_ptr;
2204 enum tree_code *rescode_ptr;
2207 tree op0 = *op0_ptr;
2208 tree op1 = *op1_ptr;
2209 int unsignedp0, unsignedp1;
2211 tree primop0, primop1;
2212 enum tree_code code = *rescode_ptr;
2214 /* Throw away any conversions to wider types
2215 already present in the operands. */
2217 primop0 = get_narrower (op0, &unsignedp0);
2218 primop1 = get_narrower (op1, &unsignedp1);
2220 /* Handle the case that OP0 does not *contain* a conversion
2221 but it *requires* conversion to FINAL_TYPE. */
2223 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
2224 unsignedp0 = TREE_UNSIGNED (TREE_TYPE (op0));
2225 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
2226 unsignedp1 = TREE_UNSIGNED (TREE_TYPE (op1));
2228 /* If one of the operands must be floated, we cannot optimize. */
2229 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
2230 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
2232 /* If first arg is constant, swap the args (changing operation
2233 so value is preserved), for canonicalization. Don't do this if
2234 the second arg is 0. */
2236 if (TREE_CONSTANT (primop0)
2237 && ! integer_zerop (primop1) && ! real_zerop (primop1))
2239 register tree tem = primop0;
2240 register int temi = unsignedp0;
2248 unsignedp0 = unsignedp1;
2271 *rescode_ptr = code;
2274 /* If comparing an integer against a constant more bits wide,
2275 maybe we can deduce a value of 1 or 0 independent of the data.
2276 Or else truncate the constant now
2277 rather than extend the variable at run time.
2279 This is only interesting if the constant is the wider arg.
2280 Also, it is not safe if the constant is unsigned and the
2281 variable arg is signed, since in this case the variable
2282 would be sign-extended and then regarded as unsigned.
2283 Our technique fails in this case because the lowest/highest
2284 possible unsigned results don't follow naturally from the
2285 lowest/highest possible values of the variable operand.
2286 For just EQ_EXPR and NE_EXPR there is another technique that
2287 could be used: see if the constant can be faithfully represented
2288 in the other operand's type, by truncating it and reextending it
2289 and see if that preserves the constant's value. */
2291 if (!real1 && !real2
2292 && TREE_CODE (primop1) == INTEGER_CST
2293 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
2295 int min_gt, max_gt, min_lt, max_lt;
2296 tree maxval, minval;
2297 /* 1 if comparison is nominally unsigned. */
2298 int unsignedp = TREE_UNSIGNED (*restype_ptr);
2301 type = signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0));
2303 /* If TYPE is an enumeration, then we need to get its min/max
2304 values from it's underlying integral type, not the enumerated
2306 if (TREE_CODE (type) == ENUMERAL_TYPE)
2307 type = type_for_size (TYPE_PRECISION (type), unsignedp0);
2309 maxval = TYPE_MAX_VALUE (type);
2310 minval = TYPE_MIN_VALUE (type);
2312 if (unsignedp && !unsignedp0)
2313 *restype_ptr = signed_type (*restype_ptr);
2315 if (TREE_TYPE (primop1) != *restype_ptr)
2316 primop1 = convert (*restype_ptr, primop1);
2317 if (type != *restype_ptr)
2319 minval = convert (*restype_ptr, minval);
2320 maxval = convert (*restype_ptr, maxval);
2323 if (unsignedp && unsignedp0)
2325 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
2326 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
2327 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
2328 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
2332 min_gt = INT_CST_LT (primop1, minval);
2333 max_gt = INT_CST_LT (primop1, maxval);
2334 min_lt = INT_CST_LT (minval, primop1);
2335 max_lt = INT_CST_LT (maxval, primop1);
2339 /* This used to be a switch, but Genix compiler can't handle that. */
2340 if (code == NE_EXPR)
2342 if (max_lt || min_gt)
2343 val = boolean_true_node;
2345 else if (code == EQ_EXPR)
2347 if (max_lt || min_gt)
2348 val = boolean_false_node;
2350 else if (code == LT_EXPR)
2353 val = boolean_true_node;
2355 val = boolean_false_node;
2357 else if (code == GT_EXPR)
2360 val = boolean_true_node;
2362 val = boolean_false_node;
2364 else if (code == LE_EXPR)
2367 val = boolean_true_node;
2369 val = boolean_false_node;
2371 else if (code == GE_EXPR)
2374 val = boolean_true_node;
2376 val = boolean_false_node;
2379 /* If primop0 was sign-extended and unsigned comparison specd,
2380 we did a signed comparison above using the signed type bounds.
2381 But the comparison we output must be unsigned.
2383 Also, for inequalities, VAL is no good; but if the signed
2384 comparison had *any* fixed result, it follows that the
2385 unsigned comparison just tests the sign in reverse
2386 (positive values are LE, negative ones GE).
2387 So we can generate an unsigned comparison
2388 against an extreme value of the signed type. */
2390 if (unsignedp && !unsignedp0)
2397 primop1 = TYPE_MIN_VALUE (type);
2403 primop1 = TYPE_MAX_VALUE (type);
2410 type = unsigned_type (type);
2413 if (!max_gt && !unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
2415 /* This is the case of (char)x >?< 0x80, which people used to use
2416 expecting old C compilers to change the 0x80 into -0x80. */
2417 if (val == boolean_false_node)
2418 warning ("comparison is always false due to limited range of data type");
2419 if (val == boolean_true_node)
2420 warning ("comparison is always true due to limited range of data type");
2423 if (!min_lt && unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
2425 /* This is the case of (unsigned char)x >?< -1 or < 0. */
2426 if (val == boolean_false_node)
2427 warning ("comparison is always false due to limited range of data type");
2428 if (val == boolean_true_node)
2429 warning ("comparison is always true due to limited range of data type");
2434 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2435 if (TREE_SIDE_EFFECTS (primop0))
2436 return build (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
2440 /* Value is not predetermined, but do the comparison
2441 in the type of the operand that is not constant.
2442 TYPE is already properly set. */
2444 else if (real1 && real2
2445 && (TYPE_PRECISION (TREE_TYPE (primop0))
2446 == TYPE_PRECISION (TREE_TYPE (primop1))))
2447 type = TREE_TYPE (primop0);
2449 /* If args' natural types are both narrower than nominal type
2450 and both extend in the same manner, compare them
2451 in the type of the wider arg.
2452 Otherwise must actually extend both to the nominal
2453 common type lest different ways of extending
2455 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
2457 else if (unsignedp0 == unsignedp1 && real1 == real2
2458 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
2459 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
2461 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
2462 type = signed_or_unsigned_type (unsignedp0
2463 || TREE_UNSIGNED (*restype_ptr),
2465 /* Make sure shorter operand is extended the right way
2466 to match the longer operand. */
2467 primop0 = convert (signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0)),
2469 primop1 = convert (signed_or_unsigned_type (unsignedp1, TREE_TYPE (primop1)),
2474 /* Here we must do the comparison on the nominal type
2475 using the args exactly as we received them. */
2476 type = *restype_ptr;
2480 if (!real1 && !real2 && integer_zerop (primop1)
2481 && TREE_UNSIGNED (*restype_ptr))
2487 /* All unsigned values are >= 0, so we warn if extra warnings
2488 are requested. However, if OP0 is a constant that is
2489 >= 0, the signedness of the comparison isn't an issue,
2490 so suppress the warning. */
2491 if (extra_warnings && !in_system_header
2492 && ! (TREE_CODE (primop0) == INTEGER_CST
2493 && ! TREE_OVERFLOW (convert (signed_type (type),
2495 warning ("comparison of unsigned expression >= 0 is always true");
2496 value = boolean_true_node;
2500 if (extra_warnings && !in_system_header
2501 && ! (TREE_CODE (primop0) == INTEGER_CST
2502 && ! TREE_OVERFLOW (convert (signed_type (type),
2504 warning ("comparison of unsigned expression < 0 is always false");
2505 value = boolean_false_node;
2514 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2515 if (TREE_SIDE_EFFECTS (primop0))
2516 return build (COMPOUND_EXPR, TREE_TYPE (value),
2523 *op0_ptr = convert (type, primop0);
2524 *op1_ptr = convert (type, primop1);
2526 *restype_ptr = boolean_type_node;
2531 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
2532 or validate its data type for an `if' or `while' statement or ?..: exp.
2534 This preparation consists of taking the ordinary
2535 representation of an expression expr and producing a valid tree
2536 boolean expression describing whether expr is nonzero. We could
2537 simply always do build_binary_op (NE_EXPR, expr, boolean_false_node, 1),
2538 but we optimize comparisons, &&, ||, and !.
2540 The resulting type should always be `boolean_type_node'. */
2543 truthvalue_conversion (expr)
2546 if (TREE_CODE (expr) == ERROR_MARK)
2549 #if 0 /* This appears to be wrong for C++. */
2550 /* These really should return error_mark_node after 2.4 is stable.
2551 But not all callers handle ERROR_MARK properly. */
2552 switch (TREE_CODE (TREE_TYPE (expr)))
2555 error ("struct type value used where scalar is required");
2556 return boolean_false_node;
2559 error ("union type value used where scalar is required");
2560 return boolean_false_node;
2563 error ("array type value used where scalar is required");
2564 return boolean_false_node;
2571 switch (TREE_CODE (expr))
2574 case NE_EXPR: case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
2575 case TRUTH_ANDIF_EXPR:
2576 case TRUTH_ORIF_EXPR:
2577 case TRUTH_AND_EXPR:
2579 case TRUTH_XOR_EXPR:
2580 case TRUTH_NOT_EXPR:
2581 TREE_TYPE (expr) = boolean_type_node;
2588 return integer_zerop (expr) ? boolean_false_node : boolean_true_node;
2591 return real_zerop (expr) ? boolean_false_node : boolean_true_node;
2594 /* If we are taking the address of a external decl, it might be zero
2595 if it is weak, so we cannot optimize. */
2596 if (DECL_P (TREE_OPERAND (expr, 0))
2597 && DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
2600 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
2601 return build (COMPOUND_EXPR, boolean_type_node,
2602 TREE_OPERAND (expr, 0), boolean_true_node);
2604 return boolean_true_node;
2607 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
2608 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
2609 truthvalue_conversion (TREE_OPERAND (expr, 0)),
2610 truthvalue_conversion (TREE_OPERAND (expr, 1)),
2617 /* These don't change whether an object is non-zero or zero. */
2618 return truthvalue_conversion (TREE_OPERAND (expr, 0));
2622 /* These don't change whether an object is zero or non-zero, but
2623 we can't ignore them if their second arg has side-effects. */
2624 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
2625 return build (COMPOUND_EXPR, boolean_type_node, TREE_OPERAND (expr, 1),
2626 truthvalue_conversion (TREE_OPERAND (expr, 0)));
2628 return truthvalue_conversion (TREE_OPERAND (expr, 0));
2631 /* Distribute the conversion into the arms of a COND_EXPR. */
2632 return fold (build (COND_EXPR, boolean_type_node, TREE_OPERAND (expr, 0),
2633 truthvalue_conversion (TREE_OPERAND (expr, 1)),
2634 truthvalue_conversion (TREE_OPERAND (expr, 2))));
2637 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
2638 since that affects how `default_conversion' will behave. */
2639 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
2640 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
2642 /* fall through... */
2644 /* If this is widening the argument, we can ignore it. */
2645 if (TYPE_PRECISION (TREE_TYPE (expr))
2646 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
2647 return truthvalue_conversion (TREE_OPERAND (expr, 0));
2651 /* With IEEE arithmetic, x - x may not equal 0, so we can't optimize
2653 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
2654 && TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE)
2656 /* fall through... */
2658 /* This and MINUS_EXPR can be changed into a comparison of the
2660 if (TREE_TYPE (TREE_OPERAND (expr, 0))
2661 == TREE_TYPE (TREE_OPERAND (expr, 1)))
2662 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
2663 TREE_OPERAND (expr, 1), 1);
2664 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
2665 fold (build1 (NOP_EXPR,
2666 TREE_TYPE (TREE_OPERAND (expr, 0)),
2667 TREE_OPERAND (expr, 1))), 1);
2670 if (integer_onep (TREE_OPERAND (expr, 1))
2671 && TREE_TYPE (expr) != boolean_type_node)
2672 /* Using convert here would cause infinite recursion. */
2673 return build1 (NOP_EXPR, boolean_type_node, expr);
2677 if (warn_parentheses && C_EXP_ORIGINAL_CODE (expr) == MODIFY_EXPR)
2678 warning ("suggest parentheses around assignment used as truth value");
2685 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
2687 tree tem = save_expr (expr);
2688 return (build_binary_op
2689 ((TREE_SIDE_EFFECTS (expr)
2690 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
2691 truthvalue_conversion (build_unary_op (REALPART_EXPR, tem, 0)),
2692 truthvalue_conversion (build_unary_op (IMAGPART_EXPR, tem, 0)),
2696 return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
2699 static tree builtin_function_2 PARAMS ((const char *, const char *, tree, tree,
2700 int, enum built_in_class, int, int,
2703 /* Make a variant type in the proper way for C/C++, propagating qualifiers
2704 down to the element type of an array. */
2707 c_build_qualified_type (type, type_quals)
2711 /* A restrict-qualified pointer type must be a pointer to object or
2712 incomplete type. Note that the use of POINTER_TYPE_P also allows
2713 REFERENCE_TYPEs, which is appropriate for C++. Unfortunately,
2714 the C++ front-end also use POINTER_TYPE for pointer-to-member
2715 values, so even though it should be illegal to use `restrict'
2716 with such an entity we don't flag that here. Thus, special case
2717 code for that case is required in the C++ front-end. */
2718 if ((type_quals & TYPE_QUAL_RESTRICT)
2719 && (!POINTER_TYPE_P (type)
2720 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
2722 error ("invalid use of `restrict'");
2723 type_quals &= ~TYPE_QUAL_RESTRICT;
2726 if (TREE_CODE (type) == ARRAY_TYPE)
2727 return build_array_type (c_build_qualified_type (TREE_TYPE (type),
2729 TYPE_DOMAIN (type));
2730 return build_qualified_type (type, type_quals);
2733 /* Apply the TYPE_QUALS to the new DECL. */
2736 c_apply_type_quals_to_decl (type_quals, decl)
2740 if ((type_quals & TYPE_QUAL_CONST)
2741 || (TREE_TYPE (decl)
2742 && TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE))
2743 TREE_READONLY (decl) = 1;
2744 if (type_quals & TYPE_QUAL_VOLATILE)
2746 TREE_SIDE_EFFECTS (decl) = 1;
2747 TREE_THIS_VOLATILE (decl) = 1;
2749 if (type_quals & TYPE_QUAL_RESTRICT)
2751 if (!TREE_TYPE (decl)
2752 || !POINTER_TYPE_P (TREE_TYPE (decl))
2753 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (TREE_TYPE (decl))))
2754 error ("invalid use of `restrict'");
2755 else if (flag_strict_aliasing)
2757 /* No two restricted pointers can point at the same thing.
2758 However, a restricted pointer can point at the same thing
2759 as an unrestricted pointer, if that unrestricted pointer
2760 is based on the restricted pointer. So, we make the
2761 alias set for the restricted pointer a subset of the
2762 alias set for the type pointed to by the type of the
2765 HOST_WIDE_INT pointed_to_alias_set
2766 = get_alias_set (TREE_TYPE (TREE_TYPE (decl)));
2768 if (pointed_to_alias_set == 0)
2769 /* It's not legal to make a subset of alias set zero. */
2773 DECL_POINTER_ALIAS_SET (decl) = new_alias_set ();
2774 record_alias_subset (pointed_to_alias_set,
2775 DECL_POINTER_ALIAS_SET (decl));
2782 /* Return the typed-based alias set for T, which may be an expression
2783 or a type. Return -1 if we don't do anything special. */
2786 lang_get_alias_set (t)
2791 /* We know nothing about vector types */
2792 if (TREE_CODE (t) == VECTOR_TYPE)
2795 /* Permit type-punning when accessing a union, provided the access
2796 is directly through the union. For example, this code does not
2797 permit taking the address of a union member and then storing
2798 through it. Even the type-punning allowed here is a GCC
2799 extension, albeit a common and useful one; the C standard says
2800 that such accesses have implementation-defined behavior. */
2802 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
2803 u = TREE_OPERAND (u, 0))
2804 if (TREE_CODE (u) == COMPONENT_REF
2805 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
2808 /* If this is a char *, the ANSI C standard says it can alias
2809 anything. Note that all references need do this. */
2810 if (TREE_CODE_CLASS (TREE_CODE (t)) == 'r'
2811 && TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
2812 && TYPE_PRECISION (TREE_TYPE (t)) == TYPE_PRECISION (char_type_node))
2815 /* That's all the expressions we handle specially. */
2819 /* The C standard specifically allows aliasing between signed and
2820 unsigned variants of the same type. We treat the signed
2821 variant as canonical. */
2822 if (TREE_CODE (t) == INTEGER_TYPE && TREE_UNSIGNED (t))
2824 tree t1 = signed_type (t);
2826 /* t1 == t can happen for boolean nodes which are always unsigned. */
2828 return get_alias_set (t1);
2830 else if (POINTER_TYPE_P (t))
2834 /* Unfortunately, there is no canonical form of a pointer type.
2835 In particular, if we have `typedef int I', then `int *', and
2836 `I *' are different types. So, we have to pick a canonical
2837 representative. We do this below.
2839 Technically, this approach is actually more conservative that
2840 it needs to be. In particular, `const int *' and `int *'
2841 chould be in different alias sets, according to the C and C++
2842 standard, since their types are not the same, and so,
2843 technically, an `int **' and `const int **' cannot point at
2846 But, the standard is wrong. In particular, this code is
2851 const int* const* cipp = &ipp;
2853 And, it doesn't make sense for that to be legal unless you
2854 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
2855 the pointed-to types. This issue has been reported to the
2857 t1 = build_type_no_quals (t);
2859 return get_alias_set (t1);
2861 /* It's not yet safe to use alias sets for classes in C++ because
2862 the TYPE_FIELDs list for a class doesn't mention base classes. */
2863 else if (c_language == clk_cplusplus && AGGREGATE_TYPE_P (t))
2869 /* Implement the __alignof keyword: Return the minimum required
2870 alignment of TYPE, measured in bytes. */
2876 enum tree_code code = TREE_CODE (type);
2879 /* In C++, sizeof applies to the referent. Handle alignof the same way. */
2880 if (code == REFERENCE_TYPE)
2882 type = TREE_TYPE (type);
2883 code = TREE_CODE (type);
2886 if (code == FUNCTION_TYPE)
2887 t = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT);
2888 else if (code == VOID_TYPE || code == ERROR_MARK)
2890 else if (!COMPLETE_TYPE_P (type))
2892 error ("__alignof__ applied to an incomplete type");
2896 t = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT);
2898 return fold (build1 (NOP_EXPR, c_size_type_node, t));
2901 /* Implement the __alignof keyword: Return the minimum required
2902 alignment of EXPR, measured in bytes. For VAR_DECL's and
2903 FIELD_DECL's return DECL_ALIGN (which can be set from an
2904 "aligned" __attribute__ specification). */
2907 c_alignof_expr (expr)
2912 if (TREE_CODE (expr) == VAR_DECL)
2913 t = size_int (DECL_ALIGN (expr) / BITS_PER_UNIT);
2915 else if (TREE_CODE (expr) == COMPONENT_REF
2916 && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1)))
2918 error ("`__alignof' applied to a bit-field");
2921 else if (TREE_CODE (expr) == COMPONENT_REF
2922 && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL)
2923 t = size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT);
2925 else if (TREE_CODE (expr) == INDIRECT_REF)
2927 tree t = TREE_OPERAND (expr, 0);
2929 int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
2931 while (TREE_CODE (t) == NOP_EXPR
2932 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE)
2936 t = TREE_OPERAND (t, 0);
2937 thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
2938 if (thisalign > bestalign)
2939 best = t, bestalign = thisalign;
2941 return c_alignof (TREE_TYPE (TREE_TYPE (best)));
2944 return c_alignof (TREE_TYPE (expr));
2946 return fold (build1 (NOP_EXPR, c_size_type_node, t));
2949 /* Build tree nodes and builtin functions common to both C and C++ language
2953 c_common_nodes_and_builtins ()
2957 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
2958 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
2959 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
2960 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
2961 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
2962 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
2963 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
2964 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
2965 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
2966 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
2967 #include "builtin-types.def"
2968 #undef DEF_PRIMITIVE_TYPE
2969 #undef DEF_FUNCTION_TYPE_0
2970 #undef DEF_FUNCTION_TYPE_1
2971 #undef DEF_FUNCTION_TYPE_2
2972 #undef DEF_FUNCTION_TYPE_3
2973 #undef DEF_FUNCTION_TYPE_4
2974 #undef DEF_FUNCTION_TYPE_VAR_0
2975 #undef DEF_FUNCTION_TYPE_VAR_1
2976 #undef DEF_FUNCTION_TYPE_VAR_2
2977 #undef DEF_POINTER_TYPE
2981 typedef enum builtin_type builtin_type;
2983 tree builtin_types[(int)BT_LAST];
2984 int wchar_type_size;
2985 tree array_domain_type;
2986 /* Either char* or void*. */
2987 tree traditional_ptr_type_node;
2988 /* Either const char* or const void*. */
2989 tree traditional_cptr_type_node;
2990 tree traditional_len_type_node;
2991 tree va_list_ref_type_node;
2992 tree va_list_arg_type_node;
2994 /* Define `int' and `char' first so that dbx will output them first. */
2995 record_builtin_type (RID_INT, NULL, integer_type_node);
2996 record_builtin_type (RID_CHAR, "char", char_type_node);
2998 /* `signed' is the same as `int'. FIXME: the declarations of "signed",
2999 "unsigned long", "long long unsigned" and "unsigned short" were in C++
3000 but not C. Are the conditionals here needed? */
3001 if (c_language == clk_cplusplus)
3002 record_builtin_type (RID_SIGNED, NULL, integer_type_node);
3003 record_builtin_type (RID_LONG, "long int", long_integer_type_node);
3004 record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node);
3005 record_builtin_type (RID_MAX, "long unsigned int",
3006 long_unsigned_type_node);
3007 if (c_language == clk_cplusplus)
3008 record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node);
3009 record_builtin_type (RID_MAX, "long long int",
3010 long_long_integer_type_node);
3011 record_builtin_type (RID_MAX, "long long unsigned int",
3012 long_long_unsigned_type_node);
3013 if (c_language == clk_cplusplus)
3014 record_builtin_type (RID_MAX, "long long unsigned",
3015 long_long_unsigned_type_node);
3016 record_builtin_type (RID_SHORT, "short int", short_integer_type_node);
3017 record_builtin_type (RID_MAX, "short unsigned int",
3018 short_unsigned_type_node);
3019 if (c_language == clk_cplusplus)
3020 record_builtin_type (RID_MAX, "unsigned short",
3021 short_unsigned_type_node);
3023 /* Define both `signed char' and `unsigned char'. */
3024 record_builtin_type (RID_MAX, "signed char", signed_char_type_node);
3025 record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node);
3027 /* These are types that type_for_size and type_for_mode use. */
3028 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3029 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3030 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3031 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3032 #if HOST_BITS_PER_WIDE_INT >= 64
3033 pushdecl (build_decl (TYPE_DECL, get_identifier ("__int128_t"), intTI_type_node));
3035 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3036 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3037 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3038 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3039 #if HOST_BITS_PER_WIDE_INT >= 64
3040 pushdecl (build_decl (TYPE_DECL, get_identifier ("__uint128_t"), unsigned_intTI_type_node));
3043 /* Create the widest literal types. */
3044 widest_integer_literal_type_node
3045 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3046 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3047 widest_integer_literal_type_node));
3049 widest_unsigned_literal_type_node
3050 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3051 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3052 widest_unsigned_literal_type_node));
3054 /* `unsigned long' is the standard type for sizeof.
3055 Note that stddef.h uses `unsigned long',
3056 and this must agree, even if long and int are the same size. */
3058 TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE)));
3059 signed_size_type_node = signed_type (c_size_type_node);
3060 if (flag_traditional)
3061 c_size_type_node = signed_size_type_node;
3062 set_sizetype (c_size_type_node);
3064 build_common_tree_nodes_2 (flag_short_double);
3066 record_builtin_type (RID_FLOAT, NULL, float_type_node);
3067 record_builtin_type (RID_DOUBLE, NULL, double_type_node);
3068 record_builtin_type (RID_MAX, "long double", long_double_type_node);
3070 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3071 complex_integer_type_node));
3072 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3073 complex_float_type_node));
3074 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3075 complex_double_type_node));
3076 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3077 complex_long_double_type_node));
3079 record_builtin_type (RID_VOID, NULL, void_type_node);
3081 void_zero_node = build_int_2 (0, 0);
3082 TREE_TYPE (void_zero_node) = void_type_node;
3084 void_list_node = build_void_list_node ();
3086 /* Make a type to be the domain of a few array types
3087 whose domains don't really matter.
3088 200 is small enough that it always fits in size_t
3089 and large enough that it can hold most function names for the
3090 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3091 array_domain_type = build_index_type (size_int (200));
3093 /* Make a type for arrays of characters.
3094 With luck nothing will ever really depend on the length of this
3096 char_array_type_node
3097 = build_array_type (char_type_node, array_domain_type);
3099 /* Likewise for arrays of ints. */
3101 = build_array_type (integer_type_node, array_domain_type);
3103 string_type_node = build_pointer_type (char_type_node);
3104 const_string_type_node
3105 = build_pointer_type (build_qualified_type
3106 (char_type_node, TYPE_QUAL_CONST));
3108 traditional_ptr_type_node = ((flag_traditional &&
3109 c_language != clk_cplusplus)
3110 ? string_type_node : ptr_type_node);
3111 traditional_cptr_type_node = ((flag_traditional &&
3112 c_language != clk_cplusplus)
3113 ? const_string_type_node : const_ptr_type_node);
3115 (*targetm.init_builtins) ();
3117 /* This is special for C++ so functions can be overloaded. */
3118 wchar_type_node = get_identifier (flag_short_wchar
3119 ? "short unsigned int"
3121 wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node));
3122 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3123 if (c_language == clk_cplusplus)
3125 if (TREE_UNSIGNED (wchar_type_node))
3126 wchar_type_node = make_unsigned_type (wchar_type_size);
3128 wchar_type_node = make_signed_type (wchar_type_size);
3129 record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node);
3133 signed_wchar_type_node = signed_type (wchar_type_node);
3134 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3137 /* This is for wide string constants. */
3138 wchar_array_type_node
3139 = build_array_type (wchar_type_node, array_domain_type);
3142 TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE)));
3145 TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE)));
3147 TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE)));
3149 default_function_type = build_function_type (integer_type_node, NULL_TREE);
3151 = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE)));
3152 unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
3154 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"),
3155 va_list_type_node));
3157 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_ptrdiff_t"),
3158 ptrdiff_type_node));
3160 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_size_t"),
3163 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
3165 va_list_arg_type_node = va_list_ref_type_node =
3166 build_pointer_type (TREE_TYPE (va_list_type_node));
3170 va_list_arg_type_node = va_list_type_node;
3171 va_list_ref_type_node = build_reference_type (va_list_type_node);
3174 traditional_len_type_node = ((flag_traditional &&
3175 c_language != clk_cplusplus)
3176 ? integer_type_node : sizetype);
3178 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \
3179 builtin_types[(int) ENUM] = VALUE;
3180 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \
3181 builtin_types[(int) ENUM] \
3182 = build_function_type (builtin_types[(int) RETURN], \
3184 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \
3185 builtin_types[(int) ENUM] \
3186 = build_function_type (builtin_types[(int) RETURN], \
3187 tree_cons (NULL_TREE, \
3188 builtin_types[(int) ARG1], \
3190 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \
3191 builtin_types[(int) ENUM] \
3192 = build_function_type \
3193 (builtin_types[(int) RETURN], \
3194 tree_cons (NULL_TREE, \
3195 builtin_types[(int) ARG1], \
3196 tree_cons (NULL_TREE, \
3197 builtin_types[(int) ARG2], \
3199 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
3200 builtin_types[(int) ENUM] \
3201 = build_function_type \
3202 (builtin_types[(int) RETURN], \
3203 tree_cons (NULL_TREE, \
3204 builtin_types[(int) ARG1], \
3205 tree_cons (NULL_TREE, \
3206 builtin_types[(int) ARG2], \
3207 tree_cons (NULL_TREE, \
3208 builtin_types[(int) ARG3], \
3210 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
3211 builtin_types[(int) ENUM] \
3212 = build_function_type \
3213 (builtin_types[(int) RETURN], \
3214 tree_cons (NULL_TREE, \
3215 builtin_types[(int) ARG1], \
3216 tree_cons (NULL_TREE, \
3217 builtin_types[(int) ARG2], \
3220 builtin_types[(int) ARG3], \
3221 tree_cons (NULL_TREE, \
3222 builtin_types[(int) ARG4], \
3223 void_list_node)))));
3224 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \
3225 builtin_types[(int) ENUM] \
3226 = build_function_type (builtin_types[(int) RETURN], NULL_TREE);
3227 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \
3228 builtin_types[(int) ENUM] \
3229 = build_function_type (builtin_types[(int) RETURN], \
3230 tree_cons (NULL_TREE, \
3231 builtin_types[(int) ARG1], \
3234 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \
3235 builtin_types[(int) ENUM] \
3236 = build_function_type \
3237 (builtin_types[(int) RETURN], \
3238 tree_cons (NULL_TREE, \
3239 builtin_types[(int) ARG1], \
3240 tree_cons (NULL_TREE, \
3241 builtin_types[(int) ARG2], \
3243 #define DEF_POINTER_TYPE(ENUM, TYPE) \
3244 builtin_types[(int) ENUM] \
3245 = build_pointer_type (builtin_types[(int) TYPE]);
3246 #include "builtin-types.def"
3247 #undef DEF_PRIMITIVE_TYPE
3248 #undef DEF_FUNCTION_TYPE_1
3249 #undef DEF_FUNCTION_TYPE_2
3250 #undef DEF_FUNCTION_TYPE_3
3251 #undef DEF_FUNCTION_TYPE_4
3252 #undef DEF_FUNCTION_TYPE_VAR_0
3253 #undef DEF_FUNCTION_TYPE_VAR_1
3254 #undef DEF_POINTER_TYPE
3256 #define DEF_BUILTIN(ENUM, NAME, CLASS, \
3257 TYPE, LIBTYPE, BOTH_P, FALLBACK_P, NONANSI_P) \
3262 if (strncmp (NAME, "__builtin_", strlen ("__builtin_")) != 0) \
3266 decl = builtin_function (NAME, builtin_types[TYPE], ENUM, \
3269 ? (NAME + strlen ("__builtin_")) \
3272 decl = builtin_function_2 (NAME, \
3273 NAME + strlen ("__builtin_"), \
3274 builtin_types[TYPE], \
3275 builtin_types[LIBTYPE], \
3280 /*noreturn_p=*/0); \
3282 built_in_decls[(int) ENUM] = decl; \
3284 #include "builtins.def"
3287 /* Declare _exit and _Exit just to mark them as non-returning. */
3288 builtin_function_2 (NULL, "_exit", NULL_TREE,
3289 builtin_types[BT_FN_VOID_INT],
3290 0, NOT_BUILT_IN, 0, 1, 1);
3291 builtin_function_2 (NULL, "_Exit", NULL_TREE,
3292 builtin_types[BT_FN_VOID_INT],
3293 0, NOT_BUILT_IN, 0, !flag_isoc99, 1);
3295 /* Declare these functions non-returning
3296 to avoid spurious "control drops through" warnings. */
3297 builtin_function_2 (NULL, "abort",
3298 NULL_TREE, ((c_language == clk_cplusplus)
3299 ? builtin_types[BT_FN_VOID]
3300 : builtin_types[BT_FN_VOID_VAR]),
3301 0, NOT_BUILT_IN, 0, 0, 1);
3303 builtin_function_2 (NULL, "exit",
3304 NULL_TREE, ((c_language == clk_cplusplus)
3305 ? builtin_types[BT_FN_VOID_INT]
3306 : builtin_types[BT_FN_VOID_VAR]),
3307 0, NOT_BUILT_IN, 0, 0, 1);
3309 main_identifier_node = get_identifier ("main");
3311 /* ??? Perhaps there's a better place to do this. But it is related
3312 to __builtin_va_arg, so it isn't that off-the-wall. */
3313 lang_type_promotes_to = simple_type_promotes_to;
3317 build_va_arg (expr, type)
3320 return build1 (VA_ARG_EXPR, type, expr);
3324 /* Possibly define a builtin function with one or two names. BUILTIN_NAME
3325 is an __builtin_-prefixed name; NAME is the ordinary name; one or both
3326 of these may be NULL (though both being NULL is useless).
3327 BUILTIN_TYPE is the type of the __builtin_-prefixed function;
3328 TYPE is the type of the function with the ordinary name. These
3329 may differ if the ordinary name is declared with a looser type to avoid
3330 conflicts with headers. FUNCTION_CODE and CLASS are as for
3331 builtin_function. If LIBRARY_NAME_P is nonzero, NAME is passed as
3332 the LIBRARY_NAME parameter to builtin_function when declaring BUILTIN_NAME.
3333 If NONANSI_P is nonzero, the name NAME is treated as a non-ANSI name; if
3334 NORETURN_P is nonzero, the function is marked as non-returning.
3335 Returns the declaration of BUILTIN_NAME, if any, otherwise
3336 the declaration of NAME. Does not declare NAME if flag_no_builtin,
3337 or if NONANSI_P and flag_no_nonansi_builtin. */
3340 builtin_function_2 (builtin_name, name, builtin_type, type, function_code,
3341 class, library_name_p, nonansi_p, noreturn_p)
3342 const char *builtin_name;
3347 enum built_in_class class;
3352 tree bdecl = NULL_TREE;
3353 tree decl = NULL_TREE;
3354 if (builtin_name != 0)
3356 bdecl = builtin_function (builtin_name, builtin_type, function_code,
3357 class, library_name_p ? name : NULL);
3360 TREE_THIS_VOLATILE (bdecl) = 1;
3361 TREE_SIDE_EFFECTS (bdecl) = 1;
3364 if (name != 0 && !flag_no_builtin && !(nonansi_p && flag_no_nonansi_builtin))
3366 decl = builtin_function (name, type, function_code, class, NULL);
3368 DECL_BUILT_IN_NONANSI (decl) = 1;
3371 TREE_THIS_VOLATILE (decl) = 1;
3372 TREE_SIDE_EFFECTS (decl) = 1;
3375 return (bdecl != 0 ? bdecl : decl);
3378 /* Nonzero if the type T promotes to int. This is (nearly) the
3379 integral promotions defined in ISO C99 6.3.1.1/2. */
3382 c_promoting_integer_type_p (t)
3385 switch (TREE_CODE (t))
3388 return (TYPE_MAIN_VARIANT (t) == char_type_node
3389 || TYPE_MAIN_VARIANT (t) == signed_char_type_node
3390 || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node
3391 || TYPE_MAIN_VARIANT (t) == short_integer_type_node
3392 || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node);
3395 /* ??? Technically all enumerations not larger than an int
3396 promote to an int. But this is used along code paths
3397 that only want to notice a size change. */
3398 return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node);
3408 /* Given a type, apply default promotions wrt unnamed function arguments
3409 and return the new type. Return NULL_TREE if no change. */
3410 /* ??? There is a function of the same name in the C++ front end that
3411 does something similar, but is more thorough and does not return NULL
3412 if no change. We could perhaps share code, but it would make the
3413 self_promoting_type property harder to identify. */
3416 simple_type_promotes_to (type)
3419 if (TYPE_MAIN_VARIANT (type) == float_type_node)
3420 return double_type_node;
3422 if (c_promoting_integer_type_p (type))
3424 /* Traditionally, unsignedness is preserved in default promotions.
3425 Also preserve unsignedness if not really getting any wider. */
3426 if (TREE_UNSIGNED (type)
3427 && (flag_traditional
3428 || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
3429 return unsigned_type_node;
3430 return integer_type_node;
3436 /* Return 1 if PARMS specifies a fixed number of parameters
3437 and none of their types is affected by default promotions. */
3440 self_promoting_args_p (parms)
3444 for (t = parms; t; t = TREE_CHAIN (t))
3446 register tree type = TREE_VALUE (t);
3448 if (TREE_CHAIN (t) == 0 && type != void_type_node)
3454 if (TYPE_MAIN_VARIANT (type) == float_type_node)
3457 if (c_promoting_integer_type_p (type))
3463 /* Recursively examines the array elements of TYPE, until a non-array
3464 element type is found. */
3467 strip_array_types (type)
3470 while (TREE_CODE (type) == ARRAY_TYPE)
3471 type = TREE_TYPE (type);
3476 /* Recognize certain built-in functions so we can make tree-codes
3477 other than CALL_EXPR. We do this when it enables fold-const.c
3478 to do something useful. */
3479 /* ??? By rights this should go in builtins.c, but only C and C++
3480 implement build_{binary,unary}_op. Not exactly sure what bits
3481 of functionality are actually needed from those functions, or
3482 where the similar functionality exists in the other front ends. */
3485 expand_tree_builtin (function, params, coerced_params)
3486 tree function, params, coerced_params;
3488 enum tree_code code;
3490 if (DECL_BUILT_IN_CLASS (function) != BUILT_IN_NORMAL)
3493 switch (DECL_FUNCTION_CODE (function))
3497 case BUILT_IN_LLABS:
3498 case BUILT_IN_IMAXABS:
3500 case BUILT_IN_FABSL:
3501 case BUILT_IN_FABSF:
3502 if (coerced_params == 0)
3503 return integer_zero_node;
3504 return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0);
3507 case BUILT_IN_CONJF:
3508 case BUILT_IN_CONJL:
3509 if (coerced_params == 0)
3510 return integer_zero_node;
3511 return build_unary_op (CONJ_EXPR, TREE_VALUE (coerced_params), 0);
3513 case BUILT_IN_CREAL:
3514 case BUILT_IN_CREALF:
3515 case BUILT_IN_CREALL:
3516 if (coerced_params == 0)
3517 return integer_zero_node;
3518 return build_unary_op (REALPART_EXPR, TREE_VALUE (coerced_params), 0);
3520 case BUILT_IN_CIMAG:
3521 case BUILT_IN_CIMAGF:
3522 case BUILT_IN_CIMAGL:
3523 if (coerced_params == 0)
3524 return integer_zero_node;
3525 return build_unary_op (IMAGPART_EXPR, TREE_VALUE (coerced_params), 0);
3527 case BUILT_IN_ISGREATER:
3528 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
3534 case BUILT_IN_ISGREATEREQUAL:
3535 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
3541 case BUILT_IN_ISLESS:
3542 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
3548 case BUILT_IN_ISLESSEQUAL:
3549 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
3555 case BUILT_IN_ISLESSGREATER:
3556 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
3562 case BUILT_IN_ISUNORDERED:
3563 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
3564 return integer_zero_node;
3565 code = UNORDERED_EXPR;
3573 || TREE_CHAIN (params) == 0)
3575 error ("too few arguments to function `%s'",
3576 IDENTIFIER_POINTER (DECL_NAME (function)));
3577 return error_mark_node;
3579 else if (TREE_CHAIN (TREE_CHAIN (params)) != 0)
3581 error ("too many arguments to function `%s'",
3582 IDENTIFIER_POINTER (DECL_NAME (function)));
3583 return error_mark_node;
3586 arg0 = TREE_VALUE (params);
3587 arg1 = TREE_VALUE (TREE_CHAIN (params));
3588 arg0 = build_binary_op (code, arg0, arg1, 0);
3589 if (code != UNORDERED_EXPR)
3590 arg0 = build_unary_op (TRUTH_NOT_EXPR, arg0, 0);
3602 /* Returns non-zero if CODE is the code for a statement. */
3605 statement_code_p (code)
3606 enum tree_code code;
3629 if (lang_statement_code_p)
3630 return (*lang_statement_code_p) (code);
3635 /* Walk the statement tree, rooted at *tp. Apply FUNC to all the
3636 sub-trees of *TP in a pre-order traversal. FUNC is called with the
3637 DATA and the address of each sub-tree. If FUNC returns a non-NULL
3638 value, the traversal is aborted, and the value returned by FUNC is
3639 returned. If FUNC sets WALK_SUBTREES to zero, then the subtrees of
3640 the node being visited are not walked.
3642 We don't need a without_duplicates variant of this one because the
3643 statement tree is a tree, not a graph. */
3646 walk_stmt_tree (tp, func, data)
3651 enum tree_code code;
3656 #define WALK_SUBTREE(NODE) \
3659 result = walk_stmt_tree (&(NODE), func, data); \
3665 /* Skip empty subtrees. */
3669 /* Skip subtrees below non-statement nodes. */
3670 if (!statement_code_p (TREE_CODE (*tp)))
3673 /* Call the function. */
3675 result = (*func) (tp, &walk_subtrees, data);
3677 /* If we found something, return it. */
3681 /* FUNC may have modified the tree, recheck that we're looking at a
3683 code = TREE_CODE (*tp);
3684 if (!statement_code_p (code))
3687 /* Visit the subtrees unless FUNC decided that there was nothing
3688 interesting below this point in the tree. */
3691 /* Walk over all the sub-trees of this operand. Statement nodes
3692 never contain RTL, and we needn't worry about TARGET_EXPRs. */
3693 len = TREE_CODE_LENGTH (code);
3695 /* Go through the subtrees. We need to do this in forward order so
3696 that the scope of a FOR_EXPR is handled properly. */
3697 for (i = 0; i < len; ++i)
3698 WALK_SUBTREE (TREE_OPERAND (*tp, i));
3701 /* Finally visit the chain. This can be tail-recursion optimized if
3702 we write it this way. */
3703 return walk_stmt_tree (&TREE_CHAIN (*tp), func, data);
3708 /* Used to compare case labels. K1 and K2 are actually tree nodes
3709 representing case labels, or NULL_TREE for a `default' label.
3710 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
3711 K2, and 0 if K1 and K2 are equal. */
3714 case_compare (k1, k2)
3718 /* Consider a NULL key (such as arises with a `default' label) to be
3719 smaller than anything else. */
3725 return tree_int_cst_compare ((tree) k1, (tree) k2);
3728 /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If
3729 LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is
3730 actually a `default' label. If only HIGH_VALUE is NULL_TREE, then
3731 case label was declared using the usual C/C++ syntax, rather than
3732 the GNU case range extension. CASES is a tree containing all the
3733 case ranges processed so far; COND is the condition for the
3734 switch-statement itself. Returns the CASE_LABEL created, or
3735 ERROR_MARK_NODE if no CASE_LABEL is created. */
3738 c_add_case_label (cases, cond, low_value, high_value)
3747 splay_tree_node node;
3749 /* Create the LABEL_DECL itself. */
3750 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
3751 DECL_CONTEXT (label) = current_function_decl;
3753 /* If there was an error processing the switch condition, bail now
3754 before we get more confused. */
3755 if (!cond || cond == error_mark_node)
3757 /* Add a label anyhow so that the back-end doesn't think that
3758 the beginning of the switch is unreachable. */
3760 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
3761 return error_mark_node;
3764 if ((low_value && TREE_TYPE (low_value)
3765 && POINTER_TYPE_P (TREE_TYPE (low_value)))
3766 || (high_value && TREE_TYPE (high_value)
3767 && POINTER_TYPE_P (TREE_TYPE (high_value))))
3768 error ("pointers are not permitted as case values");
3770 /* Case ranges are a GNU extension. */
3771 if (high_value && pedantic)
3773 if (c_language == clk_cplusplus)
3774 pedwarn ("ISO C++ forbids range expressions in switch statements");
3776 pedwarn ("ISO C forbids range expressions in switch statements");
3779 type = TREE_TYPE (cond);
3782 low_value = check_case_value (low_value);
3783 low_value = convert_and_check (type, low_value);
3787 high_value = check_case_value (high_value);
3788 high_value = convert_and_check (type, high_value);
3791 /* If an error has occurred, bail out now. */
3792 if (low_value == error_mark_node || high_value == error_mark_node)
3795 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
3796 return error_mark_node;
3799 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
3800 really a case range, even though it was written that way. Remove
3801 the HIGH_VALUE to simplify later processing. */
3802 if (tree_int_cst_equal (low_value, high_value))
3803 high_value = NULL_TREE;
3804 if (low_value && high_value
3805 && !tree_int_cst_lt (low_value, high_value))
3806 warning ("empty range specified");
3808 /* Look up the LOW_VALUE in the table of case labels we already
3810 node = splay_tree_lookup (cases, (splay_tree_key) low_value);
3811 /* If there was not an exact match, check for overlapping ranges.
3812 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
3813 that's a `default' label and the only overlap is an exact match. */
3814 if (!node && (low_value || high_value))
3816 splay_tree_node low_bound;
3817 splay_tree_node high_bound;
3819 /* Even though there wasn't an exact match, there might be an
3820 overlap between this case range and another case range.
3821 Since we've (inductively) not allowed any overlapping case
3822 ranges, we simply need to find the greatest low case label
3823 that is smaller that LOW_VALUE, and the smallest low case
3824 label that is greater than LOW_VALUE. If there is an overlap
3825 it will occur in one of these two ranges. */
3826 low_bound = splay_tree_predecessor (cases,
3827 (splay_tree_key) low_value);
3828 high_bound = splay_tree_successor (cases,
3829 (splay_tree_key) low_value);
3831 /* Check to see if the LOW_BOUND overlaps. It is smaller than
3832 the LOW_VALUE, so there is no need to check unless the
3833 LOW_BOUND is in fact itself a case range. */
3835 && CASE_HIGH ((tree) low_bound->value)
3836 && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value),
3839 /* Check to see if the HIGH_BOUND overlaps. The low end of that
3840 range is bigger than the low end of the current range, so we
3841 are only interested if the current range is a real range, and
3842 not an ordinary case label. */
3845 && (tree_int_cst_compare ((tree) high_bound->key,
3850 /* If there was an overlap, issue an error. */
3853 tree duplicate = CASE_LABEL_DECL ((tree) node->value);
3857 error ("duplicate (or overlapping) case value");
3858 error_with_decl (duplicate,
3859 "this is the first entry overlapping that value");
3863 error ("duplicate case value") ;
3864 error_with_decl (duplicate, "previously used here");
3868 error ("multiple default labels in one switch");
3869 error_with_decl (duplicate, "this is the first default label");
3872 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
3875 /* Add a CASE_LABEL to the statement-tree. */
3876 case_label = add_stmt (build_case_label (low_value, high_value, label));
3877 /* Register this case label in the splay tree. */
3878 splay_tree_insert (cases,
3879 (splay_tree_key) low_value,
3880 (splay_tree_value) case_label);
3885 /* Finish an expression taking the address of LABEL. Returns an
3886 expression for the address. */
3889 finish_label_address_expr (label)
3896 if (c_language == clk_cplusplus)
3897 pedwarn ("ISO C++ forbids taking the address of a label");
3899 pedwarn ("ISO C forbids taking the address of a label");
3902 label = lookup_label (label);
3903 if (label == NULL_TREE)
3904 result = null_pointer_node;
3907 TREE_USED (label) = 1;
3908 result = build1 (ADDR_EXPR, ptr_type_node, label);
3909 TREE_CONSTANT (result) = 1;
3910 /* The current function in not necessarily uninlinable.
3911 Computed gotos are incompatible with inlining, but the value
3912 here could be used only in a diagnostic, for example. */
3918 /* Mark P (a stmt_tree) for GC. The use of a `void *' for the
3919 parameter allows this function to be used as a GC-marking
3926 stmt_tree st = (stmt_tree) p;
3928 ggc_mark_tree (st->x_last_stmt);
3929 ggc_mark_tree (st->x_last_expr_type);
3932 /* Mark LD for GC. */
3935 c_mark_lang_decl (c)
3936 struct c_lang_decl *c;
3938 ggc_mark_tree (c->saved_tree);
3941 /* Mark F for GC. */
3944 mark_c_language_function (f)
3945 struct language_function *f;
3950 mark_stmt_tree (&f->x_stmt_tree);
3951 ggc_mark_tree (f->x_scope_stmt_stack);
3954 /* Hook used by expand_expr to expand language-specific tree codes. */
3957 c_expand_expr (exp, target, tmode, modifier)
3960 enum machine_mode tmode;
3961 enum expand_modifier modifier;
3963 switch (TREE_CODE (exp))
3970 /* Since expand_expr_stmt calls free_temp_slots after every
3971 expression statement, we must call push_temp_slots here.
3972 Otherwise, any temporaries in use now would be considered
3973 out-of-scope after the first EXPR_STMT from within the
3976 rtl_expr = expand_start_stmt_expr ();
3977 expand_stmt (STMT_EXPR_STMT (exp));
3978 expand_end_stmt_expr (rtl_expr);
3979 result = expand_expr (rtl_expr, target, tmode, modifier);
3987 if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
3988 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
3990 && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
3991 && (DECL_BUILT_IN_CLASS (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
3992 == BUILT_IN_FRONTEND))
3993 return c_expand_builtin (exp, target, tmode, modifier);
4007 /* Hook used by safe_from_p to handle language-specific tree codes. */
4010 c_safe_from_p (target, exp)
4014 /* We can see statements here when processing the body of a
4015 statement-expression. For a declaration statement declaring a
4016 variable, look at the variable's initializer. */
4017 if (TREE_CODE (exp) == DECL_STMT)
4019 tree decl = DECL_STMT_DECL (exp);
4021 if (TREE_CODE (decl) == VAR_DECL
4022 && DECL_INITIAL (decl)
4023 && !safe_from_p (target, DECL_INITIAL (decl), /*top_p=*/0))
4027 /* For any statement, we must follow the statement-chain. */
4028 if (statement_code_p (TREE_CODE (exp)) && TREE_CHAIN (exp))
4029 return safe_from_p (target, TREE_CHAIN (exp), /*top_p=*/0);
4031 /* Assume everything else is safe. */
4035 /* Hook used by unsafe_for_reeval to handle language-specific tree codes. */
4038 c_unsafe_for_reeval (exp)
4041 /* Statement expressions may not be reevaluated. */
4042 if (TREE_CODE (exp) == STMT_EXPR)
4045 /* Walk all other expressions. */
4049 /* Tree code classes. */
4051 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
4053 static char c_tree_code_type[] = {
4055 #include "c-common.def"
4059 /* Table indexed by tree code giving number of expression
4060 operands beyond the fixed part of the node structure.
4061 Not used for types or decls. */
4063 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
4065 static int c_tree_code_length[] = {
4067 #include "c-common.def"
4071 /* Names of tree components.
4072 Used for printing out the tree and error messages. */
4073 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
4075 static const char *c_tree_code_name[] = {
4077 #include "c-common.def"
4081 /* Adds the tree codes specific to the C front end to the list of all
4087 memcpy (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE,
4089 (int)LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE);
4090 memcpy (tree_code_length + (int) LAST_AND_UNUSED_TREE_CODE,
4092 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (int));
4093 memcpy (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE,
4095 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (char *));
4096 lang_unsafe_for_reeval = c_unsafe_for_reeval;
4099 #define CALLED_AS_BUILT_IN(NODE) \
4100 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
4103 c_expand_builtin (exp, target, tmode, modifier)
4106 enum machine_mode tmode;
4107 enum expand_modifier modifier;
4109 tree type = TREE_TYPE (exp);
4110 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
4111 tree arglist = TREE_OPERAND (exp, 1);
4112 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
4113 enum tree_code code = TREE_CODE (exp);
4114 const int ignore = (target == const0_rtx
4115 || ((code == NON_LVALUE_EXPR || code == NOP_EXPR
4116 || code == CONVERT_EXPR || code == REFERENCE_EXPR
4117 || code == COND_EXPR)
4118 && TREE_CODE (type) == VOID_TYPE));
4120 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl))
4121 return expand_call (exp, target, ignore);
4125 case BUILT_IN_PRINTF:
4126 target = c_expand_builtin_printf (arglist, target, tmode,
4132 case BUILT_IN_FPRINTF:
4133 target = c_expand_builtin_fprintf (arglist, target, tmode,
4139 default: /* just do library call, if unknown builtin */
4140 error ("built-in function `%s' not currently supported",
4141 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
4144 /* The switch statement above can drop through to cause the function
4145 to be called normally. */
4146 return expand_call (exp, target, ignore);
4149 /* Check an arglist to *printf for problems. The arglist should start
4150 at the format specifier, with the remaining arguments immediately
4153 is_valid_printf_arglist (arglist)
4156 /* Save this value so we can restore it later. */
4157 const int SAVE_pedantic = pedantic;
4158 int diagnostic_occurred = 0;
4160 /* Set this to a known value so the user setting won't affect code
4163 /* Check to make sure there are no format specifier errors. */
4164 check_function_format (&diagnostic_occurred,
4165 maybe_get_identifier("printf"),
4166 NULL_TREE, arglist);
4168 /* Restore the value of `pedantic'. */
4169 pedantic = SAVE_pedantic;
4171 /* If calling `check_function_format_ptr' produces a warning, we
4172 return false, otherwise we return true. */
4173 return ! diagnostic_occurred;
4176 /* If the arguments passed to printf are suitable for optimizations,
4177 we attempt to transform the call. */
4179 c_expand_builtin_printf (arglist, target, tmode, modifier, ignore)
4182 enum machine_mode tmode;
4183 enum expand_modifier modifier;
4186 tree fn_putchar = built_in_decls[BUILT_IN_PUTCHAR],
4187 fn_puts = built_in_decls[BUILT_IN_PUTS];
4188 tree fn, format_arg, stripped_string;
4190 /* If the return value is used, or the replacement _DECL isn't
4191 initialized, don't do the transformation. */
4192 if (!ignore || !fn_putchar || !fn_puts)
4195 /* Verify the required arguments in the original call. */
4197 || (TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE))
4200 /* Check the specifier vs. the parameters. */
4201 if (!is_valid_printf_arglist (arglist))
4204 format_arg = TREE_VALUE (arglist);
4205 stripped_string = format_arg;
4206 STRIP_NOPS (stripped_string);
4207 if (stripped_string && TREE_CODE (stripped_string) == ADDR_EXPR)
4208 stripped_string = TREE_OPERAND (stripped_string, 0);
4210 /* If the format specifier isn't a STRING_CST, punt. */
4211 if (TREE_CODE (stripped_string) != STRING_CST)
4214 /* OK! We can attempt optimization. */
4216 /* If the format specifier was "%s\n", call __builtin_puts(arg2). */
4217 if (strcmp (TREE_STRING_POINTER (stripped_string), "%s\n") == 0)
4219 arglist = TREE_CHAIN (arglist);
4222 /* If the format specifier was "%c", call __builtin_putchar (arg2). */
4223 else if (strcmp (TREE_STRING_POINTER (stripped_string), "%c") == 0)
4225 arglist = TREE_CHAIN (arglist);
4230 /* We can't handle anything else with % args or %% ... yet. */
4231 if (strchr (TREE_STRING_POINTER (stripped_string), '%'))
4234 /* If the resulting constant string has a length of 1, call
4235 putchar. Note, TREE_STRING_LENGTH includes the terminating
4236 NULL in its count. */
4237 if (TREE_STRING_LENGTH (stripped_string) == 2)
4239 /* Given printf("c"), (where c is any one character,)
4240 convert "c"[0] to an int and pass that to the replacement
4242 arglist = build_int_2 (TREE_STRING_POINTER (stripped_string)[0], 0);
4243 arglist = build_tree_list (NULL_TREE, arglist);
4247 /* If the resulting constant was "string\n", call
4248 __builtin_puts("string"). Ensure "string" has at least one
4249 character besides the trailing \n. Note, TREE_STRING_LENGTH
4250 includes the terminating NULL in its count. */
4251 else if (TREE_STRING_LENGTH (stripped_string) > 2
4252 && TREE_STRING_POINTER (stripped_string)
4253 [TREE_STRING_LENGTH (stripped_string) - 2] == '\n')
4255 /* Create a NULL-terminated string that's one char shorter
4256 than the original, stripping off the trailing '\n'. */
4257 const int newlen = TREE_STRING_LENGTH (stripped_string) - 1;
4258 char *newstr = (char *) alloca (newlen);
4259 memcpy (newstr, TREE_STRING_POINTER (stripped_string), newlen - 1);
4260 newstr[newlen - 1] = 0;
4262 arglist = combine_strings (build_string (newlen, newstr));
4263 arglist = build_tree_list (NULL_TREE, arglist);
4267 /* We'd like to arrange to call fputs(string) here, but we
4268 need stdout and don't have a way to get it ... yet. */
4272 return expand_expr (build_function_call (fn, arglist),
4273 (ignore ? const0_rtx : target),
4277 /* If the arguments passed to fprintf are suitable for optimizations,
4278 we attempt to transform the call. */
4280 c_expand_builtin_fprintf (arglist, target, tmode, modifier, ignore)
4283 enum machine_mode tmode;
4284 enum expand_modifier modifier;
4287 tree fn_fputc = built_in_decls[BUILT_IN_FPUTC],
4288 fn_fputs = built_in_decls[BUILT_IN_FPUTS];
4289 tree fn, format_arg, stripped_string;
4291 /* If the return value is used, or the replacement _DECL isn't
4292 initialized, don't do the transformation. */
4293 if (!ignore || !fn_fputc || !fn_fputs)
4296 /* Verify the required arguments in the original call. */
4298 || (TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
4299 || (TREE_CHAIN (arglist) == 0)
4300 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) !=
4304 /* Check the specifier vs. the parameters. */
4305 if (!is_valid_printf_arglist (TREE_CHAIN (arglist)))
4308 format_arg = TREE_VALUE (TREE_CHAIN (arglist));
4309 stripped_string = format_arg;
4310 STRIP_NOPS (stripped_string);
4311 if (stripped_string && TREE_CODE (stripped_string) == ADDR_EXPR)
4312 stripped_string = TREE_OPERAND (stripped_string, 0);
4314 /* If the format specifier isn't a STRING_CST, punt. */
4315 if (TREE_CODE (stripped_string) != STRING_CST)
4318 /* OK! We can attempt optimization. */
4320 /* If the format specifier was "%s", call __builtin_fputs(arg3, arg1). */
4321 if (strcmp (TREE_STRING_POINTER (stripped_string), "%s") == 0)
4323 tree newarglist = build_tree_list (NULL_TREE, TREE_VALUE (arglist));
4324 arglist = tree_cons (NULL_TREE,
4325 TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))),
4329 /* If the format specifier was "%c", call __builtin_fputc (arg3, arg1). */
4330 else if (strcmp (TREE_STRING_POINTER (stripped_string), "%c") == 0)
4332 tree newarglist = build_tree_list (NULL_TREE, TREE_VALUE (arglist));
4333 arglist = tree_cons (NULL_TREE,
4334 TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))),
4340 /* We can't handle anything else with % args or %% ... yet. */
4341 if (strchr (TREE_STRING_POINTER (stripped_string), '%'))
4344 /* When "string" doesn't contain %, replace all cases of
4345 fprintf(stream,string) with fputs(string,stream). The fputs
4346 builtin will take take of special cases like length==1. */
4347 arglist = tree_cons (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)),
4348 build_tree_list (NULL_TREE, TREE_VALUE (arglist)));
4352 return expand_expr (build_function_call (fn, arglist),
4353 (ignore ? const0_rtx : target),
4358 /* Given a boolean expression ARG, return a tree representing an increment
4359 or decrement (as indicated by CODE) of ARG. The front end must check for
4360 invalid cases (e.g., decrement in C++). */
4362 boolean_increment (code, arg)
4363 enum tree_code code;
4367 tree true_res = (c_language == clk_cplusplus
4369 : c_bool_true_node);
4370 arg = stabilize_reference (arg);
4373 case PREINCREMENT_EXPR:
4374 val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
4376 case POSTINCREMENT_EXPR:
4377 val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
4378 arg = save_expr (arg);
4379 val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
4380 val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
4382 case PREDECREMENT_EXPR:
4383 val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, invert_truthvalue (arg));
4385 case POSTDECREMENT_EXPR:
4386 val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, invert_truthvalue (arg));
4387 arg = save_expr (arg);
4388 val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
4389 val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
4394 TREE_SIDE_EFFECTS (val) = 1;
4399 /* Do the parts of lang_init common to C and C++. */
4401 c_common_lang_init ()
4403 /* If still "unspecified", make it match -fbounded-pointers. */
4404 if (flag_bounds_check < 0)
4405 flag_bounds_check = flag_bounded_pointers;
4407 /* Special format checking options don't work without -Wformat; warn if
4409 if (warn_format_y2k && !warn_format)
4410 warning ("-Wformat-y2k ignored without -Wformat");
4411 if (warn_format_extra_args && !warn_format)
4412 warning ("-Wformat-extra-args ignored without -Wformat");
4413 if (warn_format_nonliteral && !warn_format)
4414 warning ("-Wformat-nonliteral ignored without -Wformat");
4415 if (warn_format_security && !warn_format)
4416 warning ("-Wformat-security ignored without -Wformat");
4417 if (warn_missing_format_attribute && !warn_format)
4418 warning ("-Wmissing-format-attribute ignored without -Wformat");