08bc243195
� * c-common.c (c_get_alias_set): Allow all type-punning through unions. Don't get confused about the type of a bit-field, despite the antics of build_modify_expr. From-SVN: r23481
3244 lines
97 KiB
C
3244 lines
97 KiB
C
/* Subroutines shared by all languages that are variants of C.
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Copyright (C) 1992, 93, 94, 95, 96, 97, 1998 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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||
but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "tree.h"
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#include "c-lex.h"
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#include "c-tree.h"
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#include "flags.h"
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#include "obstack.h"
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#include "toplev.h"
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#include "output.h"
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#include "c-pragma.h"
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#include "rtl.h"
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#if USE_CPPLIB
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#include "cpplib.h"
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cpp_reader parse_in;
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cpp_options parse_options;
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static enum cpp_token cpp_token;
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#endif
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#ifndef WCHAR_TYPE_SIZE
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#ifdef INT_TYPE_SIZE
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#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
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#else
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#define WCHAR_TYPE_SIZE BITS_PER_WORD
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#endif
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#endif
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extern struct obstack permanent_obstack;
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/* Nonzero means the expression being parsed will never be evaluated.
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This is a count, since unevaluated expressions can nest. */
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int skip_evaluation;
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enum attrs {A_PACKED, A_NOCOMMON, A_COMMON, A_NORETURN, A_CONST, A_T_UNION,
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A_NO_CHECK_MEMORY_USAGE, A_NO_INSTRUMENT_FUNCTION,
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A_CONSTRUCTOR, A_DESTRUCTOR, A_MODE, A_SECTION, A_ALIGNED,
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A_UNUSED, A_FORMAT, A_FORMAT_ARG, A_WEAK, A_ALIAS,
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A_INIT_PRIORITY};
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enum format_type { printf_format_type, scanf_format_type,
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strftime_format_type };
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static void declare_hidden_char_array PROTO((char *, char *));
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static void add_attribute PROTO((enum attrs, char *,
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int, int, int));
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static void init_attributes PROTO((void));
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static void record_function_format PROTO((tree, tree, enum format_type,
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int, int));
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static void record_international_format PROTO((tree, tree, int));
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static tree c_find_base_decl PROTO((tree));
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/* Keep a stack of if statements. We record the number of compound
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statements seen up to the if keyword, as well as the line number
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and file of the if. If a potentially ambiguous else is seen, that
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fact is recorded; the warning is issued when we can be sure that
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the enclosing if statement does not have an else branch. */
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typedef struct
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{
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int compstmt_count;
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int line;
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char *file;
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int needs_warning;
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} if_elt;
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static if_elt *if_stack;
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/* Amount of space in the if statement stack. */
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static int if_stack_space = 0;
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/* Stack pointer. */
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static int if_stack_pointer = 0;
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/* Generate RTL for the start of an if-then, and record the start of it
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for ambiguous else detection. */
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/* A list of objects which have constructors or destructors which
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reside in the global scope, and have an init_priority attribute
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associated with them. The decl is stored in the TREE_VALUE slot
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and the priority number is stored in the TREE_PURPOSE slot. */
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tree static_aggregates_initp;
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void
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c_expand_start_cond (cond, exitflag, compstmt_count)
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tree cond;
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int exitflag;
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int compstmt_count;
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{
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/* Make sure there is enough space on the stack. */
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if (if_stack_space == 0)
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{
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if_stack_space = 10;
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if_stack = (if_elt *)xmalloc (10 * sizeof (if_elt));
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}
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else if (if_stack_space == if_stack_pointer)
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{
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if_stack_space += 10;
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if_stack = (if_elt *)xrealloc (if_stack, if_stack_space * sizeof (if_elt));
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}
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/* Record this if statement. */
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if_stack[if_stack_pointer].compstmt_count = compstmt_count;
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if_stack[if_stack_pointer].file = input_filename;
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if_stack[if_stack_pointer].line = lineno;
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if_stack[if_stack_pointer].needs_warning = 0;
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if_stack_pointer++;
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expand_start_cond (cond, exitflag);
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}
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/* Generate RTL for the end of an if-then. Optionally warn if a nested
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if statement had an ambiguous else clause. */
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void
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c_expand_end_cond ()
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{
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if_stack_pointer--;
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if (if_stack[if_stack_pointer].needs_warning)
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warning_with_file_and_line (if_stack[if_stack_pointer].file,
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if_stack[if_stack_pointer].line,
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"suggest explicit braces to avoid ambiguous `else'");
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expand_end_cond ();
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}
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/* Generate RTL between the then-clause and the else-clause
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of an if-then-else. */
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void
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c_expand_start_else ()
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{
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/* An ambiguous else warning must be generated for the enclosing if
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statement, unless we see an else branch for that one, too. */
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if (warn_parentheses
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&& if_stack_pointer > 1
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&& (if_stack[if_stack_pointer - 1].compstmt_count
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== if_stack[if_stack_pointer - 2].compstmt_count))
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if_stack[if_stack_pointer - 2].needs_warning = 1;
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/* Even if a nested if statement had an else branch, it can't be
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ambiguous if this one also has an else. So don't warn in that
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case. Also don't warn for any if statements nested in this else. */
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if_stack[if_stack_pointer - 1].needs_warning = 0;
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if_stack[if_stack_pointer - 1].compstmt_count--;
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expand_start_else ();
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}
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/* Make bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
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void
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declare_function_name ()
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{
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char *name, *printable_name;
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if (current_function_decl == NULL)
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{
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name = "";
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printable_name = "top level";
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}
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else
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{
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/* Allow functions to be nameless (such as artificial ones). */
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if (DECL_NAME (current_function_decl))
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name = IDENTIFIER_POINTER (DECL_NAME (current_function_decl));
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else
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name = "";
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printable_name = (*decl_printable_name) (current_function_decl, 2);
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}
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declare_hidden_char_array ("__FUNCTION__", name);
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declare_hidden_char_array ("__PRETTY_FUNCTION__", printable_name);
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}
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static void
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declare_hidden_char_array (name, value)
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char *name, *value;
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{
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tree decl, type, init;
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int vlen;
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/* If the default size of char arrays isn't big enough for the name,
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or if we want to give warnings for large objects, make a bigger one. */
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vlen = strlen (value) + 1;
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type = char_array_type_node;
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if (TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < vlen
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|| warn_larger_than)
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type = build_array_type (char_type_node,
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build_index_type (build_int_2 (vlen, 0)));
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push_obstacks_nochange ();
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decl = build_decl (VAR_DECL, get_identifier (name), type);
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TREE_STATIC (decl) = 1;
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TREE_READONLY (decl) = 1;
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TREE_ASM_WRITTEN (decl) = 1;
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DECL_SOURCE_LINE (decl) = 0;
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DECL_ARTIFICIAL (decl) = 1;
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DECL_IN_SYSTEM_HEADER (decl) = 1;
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DECL_IGNORED_P (decl) = 1;
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init = build_string (vlen, value);
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TREE_TYPE (init) = type;
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DECL_INITIAL (decl) = init;
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finish_decl (pushdecl (decl), init, NULL_TREE);
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}
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/* Given a chain of STRING_CST nodes,
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concatenate them into one STRING_CST
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and give it a suitable array-of-chars data type. */
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tree
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combine_strings (strings)
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tree strings;
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{
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register tree value, t;
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register int length = 1;
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int wide_length = 0;
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int wide_flag = 0;
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int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
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int nchars;
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if (TREE_CHAIN (strings))
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{
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/* More than one in the chain, so concatenate. */
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register char *p, *q;
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/* Don't include the \0 at the end of each substring,
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except for the last one.
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Count wide strings and ordinary strings separately. */
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for (t = strings; t; t = TREE_CHAIN (t))
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{
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if (TREE_TYPE (t) == wchar_array_type_node)
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{
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wide_length += (TREE_STRING_LENGTH (t) - wchar_bytes);
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wide_flag = 1;
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}
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else
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length += (TREE_STRING_LENGTH (t) - 1);
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}
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/* If anything is wide, the non-wides will be converted,
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which makes them take more space. */
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if (wide_flag)
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length = length * wchar_bytes + wide_length;
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p = savealloc (length);
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/* Copy the individual strings into the new combined string.
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If the combined string is wide, convert the chars to ints
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for any individual strings that are not wide. */
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q = p;
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for (t = strings; t; t = TREE_CHAIN (t))
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{
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int len = (TREE_STRING_LENGTH (t)
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- ((TREE_TYPE (t) == wchar_array_type_node)
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? wchar_bytes : 1));
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if ((TREE_TYPE (t) == wchar_array_type_node) == wide_flag)
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{
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memcpy (q, TREE_STRING_POINTER (t), len);
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q += len;
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}
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else
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{
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int i;
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for (i = 0; i < len; i++)
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{
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if (WCHAR_TYPE_SIZE == HOST_BITS_PER_SHORT)
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((short *) q)[i] = TREE_STRING_POINTER (t)[i];
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else
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((int *) q)[i] = TREE_STRING_POINTER (t)[i];
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}
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q += len * wchar_bytes;
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}
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}
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if (wide_flag)
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{
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int i;
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for (i = 0; i < wchar_bytes; i++)
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*q++ = 0;
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}
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else
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*q = 0;
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value = make_node (STRING_CST);
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TREE_STRING_POINTER (value) = p;
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TREE_STRING_LENGTH (value) = length;
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}
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else
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{
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value = strings;
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length = TREE_STRING_LENGTH (value);
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if (TREE_TYPE (value) == wchar_array_type_node)
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wide_flag = 1;
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}
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/* Compute the number of elements, for the array type. */
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nchars = wide_flag ? length / wchar_bytes : length;
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/* Create the array type for the string constant.
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-Wwrite-strings says make the string constant an array of const char
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so that copying it to a non-const pointer will get a warning.
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For C++, this is the standard behavior. */
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if (flag_const_strings
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&& (! flag_traditional && ! flag_writable_strings))
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{
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tree elements
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= build_type_variant (wide_flag ? wchar_type_node : char_type_node,
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1, 0);
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TREE_TYPE (value)
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= build_array_type (elements,
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build_index_type (build_int_2 (nchars - 1, 0)));
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}
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else
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TREE_TYPE (value)
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= build_array_type (wide_flag ? wchar_type_node : char_type_node,
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build_index_type (build_int_2 (nchars - 1, 0)));
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TREE_READONLY (value) = TREE_CONSTANT (value) = ! flag_writable_strings;
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TREE_STATIC (value) = 1;
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return value;
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}
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/* To speed up processing of attributes, we maintain an array of
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IDENTIFIER_NODES and the corresponding attribute types. */
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/* Array to hold attribute information. */
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static struct {enum attrs id; tree name; int min, max, decl_req;} attrtab[50];
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static int attrtab_idx = 0;
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/* Add an entry to the attribute table above. */
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static void
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add_attribute (id, string, min_len, max_len, decl_req)
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enum attrs id;
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char *string;
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int min_len, max_len;
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int decl_req;
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{
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char buf[100];
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attrtab[attrtab_idx].id = id;
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attrtab[attrtab_idx].name = get_identifier (string);
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attrtab[attrtab_idx].min = min_len;
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attrtab[attrtab_idx].max = max_len;
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attrtab[attrtab_idx++].decl_req = decl_req;
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||
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sprintf (buf, "__%s__", string);
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attrtab[attrtab_idx].id = id;
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attrtab[attrtab_idx].name = get_identifier (buf);
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attrtab[attrtab_idx].min = min_len;
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||
attrtab[attrtab_idx].max = max_len;
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attrtab[attrtab_idx++].decl_req = decl_req;
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||
}
|
||
|
||
/* Initialize attribute table. */
|
||
|
||
static void
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||
init_attributes ()
|
||
{
|
||
add_attribute (A_PACKED, "packed", 0, 0, 0);
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add_attribute (A_NOCOMMON, "nocommon", 0, 0, 1);
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add_attribute (A_COMMON, "common", 0, 0, 1);
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add_attribute (A_NORETURN, "noreturn", 0, 0, 1);
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add_attribute (A_NORETURN, "volatile", 0, 0, 1);
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add_attribute (A_UNUSED, "unused", 0, 0, 0);
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add_attribute (A_CONST, "const", 0, 0, 1);
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add_attribute (A_T_UNION, "transparent_union", 0, 0, 0);
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add_attribute (A_CONSTRUCTOR, "constructor", 0, 0, 1);
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add_attribute (A_DESTRUCTOR, "destructor", 0, 0, 1);
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add_attribute (A_MODE, "mode", 1, 1, 1);
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add_attribute (A_SECTION, "section", 1, 1, 1);
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add_attribute (A_ALIGNED, "aligned", 0, 1, 0);
|
||
add_attribute (A_FORMAT, "format", 3, 3, 1);
|
||
add_attribute (A_FORMAT_ARG, "format_arg", 1, 1, 1);
|
||
add_attribute (A_WEAK, "weak", 0, 0, 1);
|
||
add_attribute (A_ALIAS, "alias", 1, 1, 1);
|
||
add_attribute (A_INIT_PRIORITY, "init_priority", 0, 1, 0);
|
||
add_attribute (A_NO_INSTRUMENT_FUNCTION, "no_instrument_function", 0, 0, 1);
|
||
add_attribute (A_NO_CHECK_MEMORY_USAGE, "no_check_memory_usage", 0, 0, 1);
|
||
}
|
||
|
||
/* Process the attributes listed in ATTRIBUTES and PREFIX_ATTRIBUTES
|
||
and install them in NODE, which is either a DECL (including a TYPE_DECL)
|
||
or a TYPE. PREFIX_ATTRIBUTES can appear after the declaration specifiers
|
||
and declaration modifiers but before the declaration proper. */
|
||
|
||
void
|
||
decl_attributes (node, attributes, prefix_attributes)
|
||
tree node, attributes, prefix_attributes;
|
||
{
|
||
tree decl = 0, type = 0;
|
||
int is_type = 0;
|
||
tree a;
|
||
|
||
if (attrtab_idx == 0)
|
||
init_attributes ();
|
||
|
||
if (TREE_CODE_CLASS (TREE_CODE (node)) == 'd')
|
||
{
|
||
decl = node;
|
||
type = TREE_TYPE (decl);
|
||
is_type = TREE_CODE (node) == TYPE_DECL;
|
||
}
|
||
else if (TREE_CODE_CLASS (TREE_CODE (node)) == 't')
|
||
type = node, is_type = 1;
|
||
|
||
#ifdef PRAGMA_INSERT_ATTRIBUTES
|
||
/* If the code in c-pragma.c wants to insert some attributes then
|
||
allow it to do so. Do this before allowing machine back ends to
|
||
insert attributes, so that they have the opportunity to override
|
||
anything done here. */
|
||
PRAGMA_INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
|
||
#endif
|
||
|
||
#ifdef INSERT_ATTRIBUTES
|
||
INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
|
||
#endif
|
||
|
||
attributes = chainon (prefix_attributes, attributes);
|
||
|
||
for (a = attributes; a; a = TREE_CHAIN (a))
|
||
{
|
||
tree name = TREE_PURPOSE (a);
|
||
tree args = TREE_VALUE (a);
|
||
int i;
|
||
enum attrs id;
|
||
|
||
for (i = 0; i < attrtab_idx; i++)
|
||
if (attrtab[i].name == name)
|
||
break;
|
||
|
||
if (i == attrtab_idx)
|
||
{
|
||
if (! valid_machine_attribute (name, args, decl, type))
|
||
warning ("`%s' attribute directive ignored",
|
||
IDENTIFIER_POINTER (name));
|
||
else if (decl != 0)
|
||
type = TREE_TYPE (decl);
|
||
continue;
|
||
}
|
||
else if (attrtab[i].decl_req && decl == 0)
|
||
{
|
||
warning ("`%s' attribute does not apply to types",
|
||
IDENTIFIER_POINTER (name));
|
||
continue;
|
||
}
|
||
else if (list_length (args) < attrtab[i].min
|
||
|| list_length (args) > attrtab[i].max)
|
||
{
|
||
error ("wrong number of arguments specified for `%s' attribute",
|
||
IDENTIFIER_POINTER (name));
|
||
continue;
|
||
}
|
||
|
||
id = attrtab[i].id;
|
||
switch (id)
|
||
{
|
||
case A_PACKED:
|
||
if (is_type)
|
||
TYPE_PACKED (type) = 1;
|
||
else if (TREE_CODE (decl) == FIELD_DECL)
|
||
DECL_PACKED (decl) = 1;
|
||
/* We can't set DECL_PACKED for a VAR_DECL, because the bit is
|
||
used for DECL_REGISTER. It wouldn't mean anything anyway. */
|
||
else
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_NOCOMMON:
|
||
if (TREE_CODE (decl) == VAR_DECL)
|
||
DECL_COMMON (decl) = 0;
|
||
else
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_COMMON:
|
||
if (TREE_CODE (decl) == VAR_DECL)
|
||
DECL_COMMON (decl) = 1;
|
||
else
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_NORETURN:
|
||
if (TREE_CODE (decl) == FUNCTION_DECL)
|
||
TREE_THIS_VOLATILE (decl) = 1;
|
||
else if (TREE_CODE (type) == POINTER_TYPE
|
||
&& TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
|
||
TREE_TYPE (decl) = type
|
||
= build_pointer_type
|
||
(build_type_variant (TREE_TYPE (type),
|
||
TREE_READONLY (TREE_TYPE (type)), 1));
|
||
else
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_UNUSED:
|
||
if (is_type)
|
||
TREE_USED (type) = 1;
|
||
else if (TREE_CODE (decl) == PARM_DECL
|
||
|| TREE_CODE (decl) == VAR_DECL
|
||
|| TREE_CODE (decl) == FUNCTION_DECL)
|
||
TREE_USED (decl) = 1;
|
||
else
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_CONST:
|
||
if (TREE_CODE (decl) == FUNCTION_DECL)
|
||
TREE_READONLY (decl) = 1;
|
||
else if (TREE_CODE (type) == POINTER_TYPE
|
||
&& TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
|
||
TREE_TYPE (decl) = type
|
||
= build_pointer_type
|
||
(build_type_variant (TREE_TYPE (type), 1,
|
||
TREE_THIS_VOLATILE (TREE_TYPE (type))));
|
||
else
|
||
warning ( "`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_T_UNION:
|
||
if (is_type
|
||
&& TREE_CODE (type) == UNION_TYPE
|
||
&& (decl == 0
|
||
|| (TYPE_FIELDS (type) != 0
|
||
&& TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))))
|
||
TYPE_TRANSPARENT_UNION (type) = 1;
|
||
else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
|
||
&& TREE_CODE (type) == UNION_TYPE
|
||
&& TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))
|
||
DECL_TRANSPARENT_UNION (decl) = 1;
|
||
else
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_CONSTRUCTOR:
|
||
if (TREE_CODE (decl) == FUNCTION_DECL
|
||
&& TREE_CODE (type) == FUNCTION_TYPE
|
||
&& decl_function_context (decl) == 0)
|
||
{
|
||
DECL_STATIC_CONSTRUCTOR (decl) = 1;
|
||
TREE_USED (decl) = 1;
|
||
}
|
||
else
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_DESTRUCTOR:
|
||
if (TREE_CODE (decl) == FUNCTION_DECL
|
||
&& TREE_CODE (type) == FUNCTION_TYPE
|
||
&& decl_function_context (decl) == 0)
|
||
{
|
||
DECL_STATIC_DESTRUCTOR (decl) = 1;
|
||
TREE_USED (decl) = 1;
|
||
}
|
||
else
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_MODE:
|
||
if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE)
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
else
|
||
{
|
||
int j;
|
||
char *p = IDENTIFIER_POINTER (TREE_VALUE (args));
|
||
int len = strlen (p);
|
||
enum machine_mode mode = VOIDmode;
|
||
tree typefm;
|
||
|
||
if (len > 4 && p[0] == '_' && p[1] == '_'
|
||
&& p[len - 1] == '_' && p[len - 2] == '_')
|
||
{
|
||
char *newp = (char *) alloca (len - 1);
|
||
|
||
strcpy (newp, &p[2]);
|
||
newp[len - 4] = '\0';
|
||
p = newp;
|
||
}
|
||
|
||
/* Give this decl a type with the specified mode.
|
||
First check for the special modes. */
|
||
if (! strcmp (p, "byte"))
|
||
mode = byte_mode;
|
||
else if (!strcmp (p, "word"))
|
||
mode = word_mode;
|
||
else if (! strcmp (p, "pointer"))
|
||
mode = ptr_mode;
|
||
else
|
||
for (j = 0; j < NUM_MACHINE_MODES; j++)
|
||
if (!strcmp (p, GET_MODE_NAME (j)))
|
||
mode = (enum machine_mode) j;
|
||
|
||
if (mode == VOIDmode)
|
||
error ("unknown machine mode `%s'", p);
|
||
else if (0 == (typefm = type_for_mode (mode,
|
||
TREE_UNSIGNED (type))))
|
||
error ("no data type for mode `%s'", p);
|
||
else
|
||
{
|
||
TREE_TYPE (decl) = type = typefm;
|
||
DECL_SIZE (decl) = 0;
|
||
layout_decl (decl, 0);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case A_SECTION:
|
||
#ifdef ASM_OUTPUT_SECTION_NAME
|
||
if ((TREE_CODE (decl) == FUNCTION_DECL
|
||
|| TREE_CODE (decl) == VAR_DECL)
|
||
&& TREE_CODE (TREE_VALUE (args)) == STRING_CST)
|
||
{
|
||
if (TREE_CODE (decl) == VAR_DECL
|
||
&& current_function_decl != NULL_TREE
|
||
&& ! TREE_STATIC (decl))
|
||
error_with_decl (decl,
|
||
"section attribute cannot be specified for local variables");
|
||
/* The decl may have already been given a section attribute from
|
||
a previous declaration. Ensure they match. */
|
||
else if (DECL_SECTION_NAME (decl) != NULL_TREE
|
||
&& strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
|
||
TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
|
||
error_with_decl (node,
|
||
"section of `%s' conflicts with previous declaration");
|
||
else
|
||
DECL_SECTION_NAME (decl) = TREE_VALUE (args);
|
||
}
|
||
else
|
||
error_with_decl (node,
|
||
"section attribute not allowed for `%s'");
|
||
#else
|
||
error_with_decl (node,
|
||
"section attributes are not supported for this target");
|
||
#endif
|
||
break;
|
||
|
||
case A_ALIGNED:
|
||
{
|
||
tree align_expr
|
||
= (args ? TREE_VALUE (args)
|
||
: size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
|
||
int align;
|
||
|
||
/* Strip any NOPs of any kind. */
|
||
while (TREE_CODE (align_expr) == NOP_EXPR
|
||
|| TREE_CODE (align_expr) == CONVERT_EXPR
|
||
|| TREE_CODE (align_expr) == NON_LVALUE_EXPR)
|
||
align_expr = TREE_OPERAND (align_expr, 0);
|
||
|
||
if (TREE_CODE (align_expr) != INTEGER_CST)
|
||
{
|
||
error ("requested alignment is not a constant");
|
||
continue;
|
||
}
|
||
|
||
align = TREE_INT_CST_LOW (align_expr) * BITS_PER_UNIT;
|
||
|
||
if (exact_log2 (align) == -1)
|
||
error ("requested alignment is not a power of 2");
|
||
else if (is_type)
|
||
TYPE_ALIGN (type) = align;
|
||
else if (TREE_CODE (decl) != VAR_DECL
|
||
&& TREE_CODE (decl) != FIELD_DECL)
|
||
error_with_decl (decl,
|
||
"alignment may not be specified for `%s'");
|
||
else
|
||
DECL_ALIGN (decl) = align;
|
||
}
|
||
break;
|
||
|
||
case A_FORMAT:
|
||
{
|
||
tree format_type_id = TREE_VALUE (args);
|
||
tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
|
||
tree first_arg_num_expr
|
||
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
|
||
int format_num;
|
||
int first_arg_num;
|
||
enum format_type format_type;
|
||
tree argument;
|
||
int arg_num;
|
||
|
||
if (TREE_CODE (decl) != FUNCTION_DECL)
|
||
{
|
||
error_with_decl (decl,
|
||
"argument format specified for non-function `%s'");
|
||
continue;
|
||
}
|
||
|
||
if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
|
||
{
|
||
error ("unrecognized format specifier");
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
char *p = IDENTIFIER_POINTER (format_type_id);
|
||
|
||
if (!strcmp (p, "printf") || !strcmp (p, "__printf__"))
|
||
format_type = printf_format_type;
|
||
else if (!strcmp (p, "scanf") || !strcmp (p, "__scanf__"))
|
||
format_type = scanf_format_type;
|
||
else if (!strcmp (p, "strftime")
|
||
|| !strcmp (p, "__strftime__"))
|
||
format_type = strftime_format_type;
|
||
else
|
||
{
|
||
error ("`%s' is an unrecognized format function type", p);
|
||
continue;
|
||
}
|
||
}
|
||
|
||
/* Strip any conversions from the string index and first arg number
|
||
and verify they are constants. */
|
||
while (TREE_CODE (format_num_expr) == NOP_EXPR
|
||
|| TREE_CODE (format_num_expr) == CONVERT_EXPR
|
||
|| TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
|
||
format_num_expr = TREE_OPERAND (format_num_expr, 0);
|
||
|
||
while (TREE_CODE (first_arg_num_expr) == NOP_EXPR
|
||
|| TREE_CODE (first_arg_num_expr) == CONVERT_EXPR
|
||
|| TREE_CODE (first_arg_num_expr) == NON_LVALUE_EXPR)
|
||
first_arg_num_expr = TREE_OPERAND (first_arg_num_expr, 0);
|
||
|
||
if (TREE_CODE (format_num_expr) != INTEGER_CST
|
||
|| TREE_CODE (first_arg_num_expr) != INTEGER_CST)
|
||
{
|
||
error ("format string has non-constant operand number");
|
||
continue;
|
||
}
|
||
|
||
format_num = TREE_INT_CST_LOW (format_num_expr);
|
||
first_arg_num = TREE_INT_CST_LOW (first_arg_num_expr);
|
||
if (first_arg_num != 0 && first_arg_num <= format_num)
|
||
{
|
||
error ("format string arg follows the args to be formatted");
|
||
continue;
|
||
}
|
||
|
||
/* If a parameter list is specified, verify that the format_num
|
||
argument is actually a string, in case the format attribute
|
||
is in error. */
|
||
argument = TYPE_ARG_TYPES (type);
|
||
if (argument)
|
||
{
|
||
for (arg_num = 1; ; ++arg_num)
|
||
{
|
||
if (argument == 0 || arg_num == format_num)
|
||
break;
|
||
argument = TREE_CHAIN (argument);
|
||
}
|
||
if (! argument
|
||
|| TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
|
||
|| (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
|
||
!= char_type_node))
|
||
{
|
||
error ("format string arg not a string type");
|
||
continue;
|
||
}
|
||
if (first_arg_num != 0)
|
||
{
|
||
/* Verify that first_arg_num points to the last arg,
|
||
the ... */
|
||
while (argument)
|
||
arg_num++, argument = TREE_CHAIN (argument);
|
||
if (arg_num != first_arg_num)
|
||
{
|
||
error ("args to be formatted is not ...");
|
||
continue;
|
||
}
|
||
}
|
||
}
|
||
|
||
record_function_format (DECL_NAME (decl),
|
||
DECL_ASSEMBLER_NAME (decl),
|
||
format_type, format_num, first_arg_num);
|
||
break;
|
||
}
|
||
|
||
case A_FORMAT_ARG:
|
||
{
|
||
tree format_num_expr = TREE_VALUE (args);
|
||
int format_num, arg_num;
|
||
tree argument;
|
||
|
||
if (TREE_CODE (decl) != FUNCTION_DECL)
|
||
{
|
||
error_with_decl (decl,
|
||
"argument format specified for non-function `%s'");
|
||
continue;
|
||
}
|
||
|
||
/* Strip any conversions from the first arg number and verify it
|
||
is a constant. */
|
||
while (TREE_CODE (format_num_expr) == NOP_EXPR
|
||
|| TREE_CODE (format_num_expr) == CONVERT_EXPR
|
||
|| TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
|
||
format_num_expr = TREE_OPERAND (format_num_expr, 0);
|
||
|
||
if (TREE_CODE (format_num_expr) != INTEGER_CST)
|
||
{
|
||
error ("format string has non-constant operand number");
|
||
continue;
|
||
}
|
||
|
||
format_num = TREE_INT_CST_LOW (format_num_expr);
|
||
|
||
/* If a parameter list is specified, verify that the format_num
|
||
argument is actually a string, in case the format attribute
|
||
is in error. */
|
||
argument = TYPE_ARG_TYPES (type);
|
||
if (argument)
|
||
{
|
||
for (arg_num = 1; ; ++arg_num)
|
||
{
|
||
if (argument == 0 || arg_num == format_num)
|
||
break;
|
||
argument = TREE_CHAIN (argument);
|
||
}
|
||
if (! argument
|
||
|| TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
|
||
|| (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
|
||
!= char_type_node))
|
||
{
|
||
error ("format string arg not a string type");
|
||
continue;
|
||
}
|
||
}
|
||
|
||
if (TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) != POINTER_TYPE
|
||
|| (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (TREE_TYPE (decl))))
|
||
!= char_type_node))
|
||
{
|
||
error ("function does not return string type");
|
||
continue;
|
||
}
|
||
|
||
record_international_format (DECL_NAME (decl),
|
||
DECL_ASSEMBLER_NAME (decl),
|
||
format_num);
|
||
break;
|
||
}
|
||
|
||
case A_WEAK:
|
||
declare_weak (decl);
|
||
break;
|
||
|
||
case A_ALIAS:
|
||
if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
|
||
|| (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl)))
|
||
error_with_decl (decl,
|
||
"`%s' defined both normally and as an alias");
|
||
else if (decl_function_context (decl) == 0)
|
||
{
|
||
tree id;
|
||
|
||
id = TREE_VALUE (args);
|
||
if (TREE_CODE (id) != STRING_CST)
|
||
{
|
||
error ("alias arg not a string");
|
||
break;
|
||
}
|
||
id = get_identifier (TREE_STRING_POINTER (id));
|
||
|
||
if (TREE_CODE (decl) == FUNCTION_DECL)
|
||
DECL_INITIAL (decl) = error_mark_node;
|
||
else
|
||
DECL_EXTERNAL (decl) = 0;
|
||
assemble_alias (decl, id);
|
||
}
|
||
else
|
||
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
|
||
break;
|
||
|
||
case A_NO_CHECK_MEMORY_USAGE:
|
||
if (TREE_CODE (decl) != FUNCTION_DECL)
|
||
{
|
||
error_with_decl (decl,
|
||
"`%s' attribute applies only to functions",
|
||
IDENTIFIER_POINTER (name));
|
||
}
|
||
else if (DECL_INITIAL (decl))
|
||
{
|
||
error_with_decl (decl,
|
||
"can't set `%s' attribute after definition",
|
||
IDENTIFIER_POINTER (name));
|
||
}
|
||
else
|
||
DECL_NO_CHECK_MEMORY_USAGE (decl) = 1;
|
||
break;
|
||
|
||
case A_INIT_PRIORITY:
|
||
{
|
||
tree initp_expr = (args ? TREE_VALUE (args): NULL_TREE);
|
||
int pri;
|
||
|
||
if (initp_expr)
|
||
STRIP_NOPS (initp_expr);
|
||
|
||
if (!initp_expr || TREE_CODE (initp_expr) != INTEGER_CST)
|
||
{
|
||
error ("requested init_priority is not an integer constant");
|
||
continue;
|
||
}
|
||
|
||
pri = TREE_INT_CST_LOW (initp_expr);
|
||
|
||
if (is_type || TREE_CODE (decl) != VAR_DECL
|
||
|| ! TREE_STATIC (decl)
|
||
|| DECL_EXTERNAL (decl)
|
||
|| (TREE_CODE (TREE_TYPE (decl)) != RECORD_TYPE
|
||
&& TREE_CODE (TREE_TYPE (decl)) != UNION_TYPE)
|
||
/* Static objects in functions are initialized the
|
||
first time control passes through that
|
||
function. This is not precise enough to pin down an
|
||
init_priority value, so don't allow it. */
|
||
|| current_function_decl)
|
||
{
|
||
error ("can only use init_priority attribute on file-scope definitions of objects of class type");
|
||
continue;
|
||
}
|
||
|
||
/* Check for init_priorities that are reserved for
|
||
implementation. Reserved for language and runtime
|
||
support implementations.*/
|
||
if ((10 <= pri && pri <= 99)
|
||
/* Reserved for standard library implementations. */
|
||
|| (500 <= pri && pri <= 999)
|
||
/* Reserved for objects with no attributes. */
|
||
|| pri > (MAX_INIT_PRIORITY - 50))
|
||
{
|
||
warning
|
||
("requested init_priority is reserved for internal use");
|
||
continue;
|
||
}
|
||
|
||
if (pri > MAX_INIT_PRIORITY || pri <= 0)
|
||
{
|
||
error ("requested init_priority is out of range");
|
||
continue;
|
||
}
|
||
|
||
static_aggregates_initp
|
||
= perm_tree_cons (initp_expr, decl, static_aggregates_initp);
|
||
break;
|
||
}
|
||
|
||
case A_NO_INSTRUMENT_FUNCTION:
|
||
if (TREE_CODE (decl) != FUNCTION_DECL)
|
||
{
|
||
error_with_decl (decl,
|
||
"`%s' attribute applies only to functions",
|
||
IDENTIFIER_POINTER (name));
|
||
}
|
||
else if (DECL_INITIAL (decl))
|
||
{
|
||
error_with_decl (decl,
|
||
"can't set `%s' attribute after definition",
|
||
IDENTIFIER_POINTER (name));
|
||
}
|
||
else
|
||
DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two
|
||
lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE).
|
||
|
||
The head of the declspec list is stored in DECLSPECS.
|
||
The head of the attribute list is stored in PREFIX_ATTRIBUTES.
|
||
|
||
Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of
|
||
the list elements. We drop the containing TREE_LIST nodes and link the
|
||
resulting attributes together the way decl_attributes expects them. */
|
||
|
||
void
|
||
split_specs_attrs (specs_attrs, declspecs, prefix_attributes)
|
||
tree specs_attrs;
|
||
tree *declspecs, *prefix_attributes;
|
||
{
|
||
tree t, s, a, next, specs, attrs;
|
||
|
||
/* This can happen in c++ (eg: decl: typespec initdecls ';'). */
|
||
if (specs_attrs != NULL_TREE
|
||
&& TREE_CODE (specs_attrs) != TREE_LIST)
|
||
{
|
||
*declspecs = specs_attrs;
|
||
*prefix_attributes = NULL_TREE;
|
||
return;
|
||
}
|
||
|
||
/* Remember to keep the lists in the same order, element-wise. */
|
||
|
||
specs = s = NULL_TREE;
|
||
attrs = a = NULL_TREE;
|
||
for (t = specs_attrs; t; t = next)
|
||
{
|
||
next = TREE_CHAIN (t);
|
||
/* Declspecs have a non-NULL TREE_VALUE. */
|
||
if (TREE_VALUE (t) != NULL_TREE)
|
||
{
|
||
if (specs == NULL_TREE)
|
||
specs = s = t;
|
||
else
|
||
{
|
||
TREE_CHAIN (s) = t;
|
||
s = t;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (attrs == NULL_TREE)
|
||
attrs = a = TREE_PURPOSE (t);
|
||
else
|
||
{
|
||
TREE_CHAIN (a) = TREE_PURPOSE (t);
|
||
a = TREE_PURPOSE (t);
|
||
}
|
||
/* More attrs can be linked here, move A to the end. */
|
||
while (TREE_CHAIN (a) != NULL_TREE)
|
||
a = TREE_CHAIN (a);
|
||
}
|
||
}
|
||
|
||
/* Terminate the lists. */
|
||
if (s != NULL_TREE)
|
||
TREE_CHAIN (s) = NULL_TREE;
|
||
if (a != NULL_TREE)
|
||
TREE_CHAIN (a) = NULL_TREE;
|
||
|
||
/* All done. */
|
||
*declspecs = specs;
|
||
*prefix_attributes = attrs;
|
||
}
|
||
|
||
/* Strip attributes from SPECS_ATTRS, a list of declspecs and attributes.
|
||
This function is used by the parser when a rule will accept attributes
|
||
in a particular position, but we don't want to support that just yet.
|
||
|
||
A warning is issued for every ignored attribute. */
|
||
|
||
tree
|
||
strip_attrs (specs_attrs)
|
||
tree specs_attrs;
|
||
{
|
||
tree specs, attrs;
|
||
|
||
split_specs_attrs (specs_attrs, &specs, &attrs);
|
||
|
||
while (attrs)
|
||
{
|
||
warning ("`%s' attribute ignored",
|
||
IDENTIFIER_POINTER (TREE_PURPOSE (attrs)));
|
||
attrs = TREE_CHAIN (attrs);
|
||
}
|
||
|
||
return specs;
|
||
}
|
||
|
||
/* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against
|
||
a parameter list. */
|
||
|
||
#define T_I &integer_type_node
|
||
#define T_L &long_integer_type_node
|
||
#define T_LL &long_long_integer_type_node
|
||
#define T_S &short_integer_type_node
|
||
#define T_UI &unsigned_type_node
|
||
#define T_UL &long_unsigned_type_node
|
||
#define T_ULL &long_long_unsigned_type_node
|
||
#define T_US &short_unsigned_type_node
|
||
#define T_F &float_type_node
|
||
#define T_D &double_type_node
|
||
#define T_LD &long_double_type_node
|
||
#define T_C &char_type_node
|
||
#define T_UC &unsigned_char_type_node
|
||
#define T_V &void_type_node
|
||
#define T_W &wchar_type_node
|
||
#define T_ST &sizetype
|
||
|
||
typedef struct {
|
||
char *format_chars;
|
||
int pointer_count;
|
||
/* Type of argument if no length modifier is used. */
|
||
tree *nolen;
|
||
/* Type of argument if length modifier for shortening to byte is used.
|
||
If NULL, then this modifier is not allowed. */
|
||
tree *hhlen;
|
||
/* Type of argument if length modifier for shortening is used.
|
||
If NULL, then this modifier is not allowed. */
|
||
tree *hlen;
|
||
/* Type of argument if length modifier `l' is used.
|
||
If NULL, then this modifier is not allowed. */
|
||
tree *llen;
|
||
/* Type of argument if length modifier `q' or `ll' is used.
|
||
If NULL, then this modifier is not allowed. */
|
||
tree *qlen;
|
||
/* Type of argument if length modifier `L' is used.
|
||
If NULL, then this modifier is not allowed. */
|
||
tree *bigllen;
|
||
/* Type of argument if length modifier `Z' is used.
|
||
If NULL, then this modifier is not allowed. */
|
||
tree *zlen;
|
||
/* List of other modifier characters allowed with these options. */
|
||
char *flag_chars;
|
||
} format_char_info;
|
||
|
||
static format_char_info print_char_table[] = {
|
||
{ "di", 0, T_I, T_I, T_I, T_L, T_LL, T_LL, T_ST, "-wp0 +" },
|
||
{ "oxX", 0, T_UI, T_UI, T_UI, T_UL, T_ULL, T_ULL, T_ST, "-wp0#" },
|
||
{ "u", 0, T_UI, T_UI, T_UI, T_UL, T_ULL, T_ULL, T_ST, "-wp0" },
|
||
/* A GNU extension. */
|
||
{ "m", 0, T_V, NULL, NULL, NULL, NULL, NULL, NULL, "-wp" },
|
||
{ "feEgGaA", 0, T_D, NULL, NULL, NULL, NULL, T_LD, NULL, "-wp0 +#" },
|
||
{ "c", 0, T_I, NULL, NULL, T_W, NULL, NULL, NULL, "-w" },
|
||
{ "C", 0, T_W, NULL, NULL, NULL, NULL, NULL, NULL, "-w" },
|
||
{ "s", 1, T_C, NULL, NULL, T_W, NULL, NULL, NULL, "-wp" },
|
||
{ "S", 1, T_W, NULL, NULL, NULL, NULL, NULL, NULL, "-wp" },
|
||
{ "p", 1, T_V, NULL, NULL, NULL, NULL, NULL, NULL, "-w" },
|
||
{ "n", 1, T_I, NULL, T_S, T_L, T_LL, NULL, NULL, "" },
|
||
{ NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
|
||
};
|
||
|
||
static format_char_info scan_char_table[] = {
|
||
{ "di", 1, T_I, T_C, T_S, T_L, T_LL, T_LL, NULL, "*" },
|
||
{ "ouxX", 1, T_UI, T_UC, T_US, T_UL, T_ULL, T_ULL, NULL, "*" },
|
||
{ "efgEGaA", 1, T_F, NULL, NULL, T_D, NULL, T_LD, NULL, "*" },
|
||
{ "c", 1, T_C, NULL, NULL, T_W, NULL, NULL, NULL, "*" },
|
||
{ "s", 1, T_C, NULL, NULL, T_W, NULL, NULL, NULL, "*a" },
|
||
{ "[", 1, T_C, NULL, NULL, NULL, NULL, NULL, NULL, "*a" },
|
||
{ "C", 1, T_W, NULL, NULL, NULL, NULL, NULL, NULL, "*" },
|
||
{ "S", 1, T_W, NULL, NULL, NULL, NULL, NULL, NULL, "*a" },
|
||
{ "p", 2, T_V, NULL, NULL, NULL, NULL, NULL, NULL, "*" },
|
||
{ "n", 1, T_I, T_C, T_S, T_L, T_LL, NULL, NULL, "" },
|
||
{ NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
|
||
};
|
||
|
||
/* Handle format characters recognized by glibc's strftime.c.
|
||
'2' - MUST do years as only two digits
|
||
'3' - MAY do years as only two digits (depending on locale)
|
||
'E' - E modifier is acceptable
|
||
'O' - O modifier is acceptable to Standard C
|
||
'o' - O modifier is acceptable as a GNU extension
|
||
'G' - other GNU extensions */
|
||
|
||
static format_char_info time_char_table[] = {
|
||
{ "y", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "2EO-_0w" },
|
||
{ "D", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "2" },
|
||
{ "g", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "2O-_0w" },
|
||
{ "cx", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "3E" },
|
||
{ "%RTXnrt", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "" },
|
||
{ "P", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "G" },
|
||
{ "HIMSUWdemw", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0Ow" },
|
||
{ "Vju", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0Oow" },
|
||
{ "Gklsz", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0OGw" },
|
||
{ "ABZa", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "^#" },
|
||
{ "p", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "#" },
|
||
{ "bh", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "^" },
|
||
{ "CY", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0EOw" },
|
||
{ NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
|
||
};
|
||
|
||
typedef struct function_format_info
|
||
{
|
||
struct function_format_info *next; /* next structure on the list */
|
||
tree name; /* identifier such as "printf" */
|
||
tree assembler_name; /* optional mangled identifier (for C++) */
|
||
enum format_type format_type; /* type of format (printf, scanf, etc.) */
|
||
int format_num; /* number of format argument */
|
||
int first_arg_num; /* number of first arg (zero for varargs) */
|
||
} function_format_info;
|
||
|
||
static function_format_info *function_format_list = NULL;
|
||
|
||
typedef struct international_format_info
|
||
{
|
||
struct international_format_info *next; /* next structure on the list */
|
||
tree name; /* identifier such as "gettext" */
|
||
tree assembler_name; /* optional mangled identifier (for C++) */
|
||
int format_num; /* number of format argument */
|
||
} international_format_info;
|
||
|
||
static international_format_info *international_format_list = NULL;
|
||
|
||
static void check_format_info PROTO((function_format_info *, tree));
|
||
|
||
/* Initialize the table of functions to perform format checking on.
|
||
The ANSI functions are always checked (whether <stdio.h> is
|
||
included or not), since it is common to call printf without
|
||
including <stdio.h>. There shouldn't be a problem with this,
|
||
since ANSI reserves these function names whether you include the
|
||
header file or not. In any case, the checking is harmless.
|
||
|
||
Also initialize the name of function that modify the format string for
|
||
internationalization purposes. */
|
||
|
||
void
|
||
init_function_format_info ()
|
||
{
|
||
record_function_format (get_identifier ("printf"), NULL_TREE,
|
||
printf_format_type, 1, 2);
|
||
record_function_format (get_identifier ("fprintf"), NULL_TREE,
|
||
printf_format_type, 2, 3);
|
||
record_function_format (get_identifier ("sprintf"), NULL_TREE,
|
||
printf_format_type, 2, 3);
|
||
record_function_format (get_identifier ("scanf"), NULL_TREE,
|
||
scanf_format_type, 1, 2);
|
||
record_function_format (get_identifier ("fscanf"), NULL_TREE,
|
||
scanf_format_type, 2, 3);
|
||
record_function_format (get_identifier ("sscanf"), NULL_TREE,
|
||
scanf_format_type, 2, 3);
|
||
record_function_format (get_identifier ("vprintf"), NULL_TREE,
|
||
printf_format_type, 1, 0);
|
||
record_function_format (get_identifier ("vfprintf"), NULL_TREE,
|
||
printf_format_type, 2, 0);
|
||
record_function_format (get_identifier ("vsprintf"), NULL_TREE,
|
||
printf_format_type, 2, 0);
|
||
record_function_format (get_identifier ("strftime"), NULL_TREE,
|
||
strftime_format_type, 3, 0);
|
||
|
||
record_international_format (get_identifier ("gettext"), NULL_TREE, 1);
|
||
record_international_format (get_identifier ("dgettext"), NULL_TREE, 2);
|
||
record_international_format (get_identifier ("dcgettext"), NULL_TREE, 2);
|
||
}
|
||
|
||
/* Record information for argument format checking. FUNCTION_IDENT is
|
||
the identifier node for the name of the function to check (its decl
|
||
need not exist yet).
|
||
FORMAT_TYPE specifies the type of format checking. FORMAT_NUM is the number
|
||
of the argument which is the format control string (starting from 1).
|
||
FIRST_ARG_NUM is the number of the first actual argument to check
|
||
against the format string, or zero if no checking is not be done
|
||
(e.g. for varargs such as vfprintf). */
|
||
|
||
static void
|
||
record_function_format (name, assembler_name, format_type,
|
||
format_num, first_arg_num)
|
||
tree name;
|
||
tree assembler_name;
|
||
enum format_type format_type;
|
||
int format_num;
|
||
int first_arg_num;
|
||
{
|
||
function_format_info *info;
|
||
|
||
/* Re-use existing structure if it's there. */
|
||
|
||
for (info = function_format_list; info; info = info->next)
|
||
{
|
||
if (info->name == name && info->assembler_name == assembler_name)
|
||
break;
|
||
}
|
||
if (! info)
|
||
{
|
||
info = (function_format_info *) xmalloc (sizeof (function_format_info));
|
||
info->next = function_format_list;
|
||
function_format_list = info;
|
||
|
||
info->name = name;
|
||
info->assembler_name = assembler_name;
|
||
}
|
||
|
||
info->format_type = format_type;
|
||
info->format_num = format_num;
|
||
info->first_arg_num = first_arg_num;
|
||
}
|
||
|
||
/* Record information for the names of function that modify the format
|
||
argument to format functions. FUNCTION_IDENT is the identifier node for
|
||
the name of the function (its decl need not exist yet) and FORMAT_NUM is
|
||
the number of the argument which is the format control string (starting
|
||
from 1). */
|
||
|
||
static void
|
||
record_international_format (name, assembler_name, format_num)
|
||
tree name;
|
||
tree assembler_name;
|
||
int format_num;
|
||
{
|
||
international_format_info *info;
|
||
|
||
/* Re-use existing structure if it's there. */
|
||
|
||
for (info = international_format_list; info; info = info->next)
|
||
{
|
||
if (info->name == name && info->assembler_name == assembler_name)
|
||
break;
|
||
}
|
||
|
||
if (! info)
|
||
{
|
||
info
|
||
= (international_format_info *)
|
||
xmalloc (sizeof (international_format_info));
|
||
info->next = international_format_list;
|
||
international_format_list = info;
|
||
|
||
info->name = name;
|
||
info->assembler_name = assembler_name;
|
||
}
|
||
|
||
info->format_num = format_num;
|
||
}
|
||
|
||
static char tfaff[] = "too few arguments for format";
|
||
|
||
/* Check the argument list of a call to printf, scanf, etc.
|
||
NAME is the function identifier.
|
||
ASSEMBLER_NAME is the function's assembler identifier.
|
||
(Either NAME or ASSEMBLER_NAME, but not both, may be NULL_TREE.)
|
||
PARAMS is the list of argument values. */
|
||
|
||
void
|
||
check_function_format (name, assembler_name, params)
|
||
tree name;
|
||
tree assembler_name;
|
||
tree params;
|
||
{
|
||
function_format_info *info;
|
||
|
||
/* See if this function is a format function. */
|
||
for (info = function_format_list; info; info = info->next)
|
||
{
|
||
if (info->assembler_name
|
||
? (info->assembler_name == assembler_name)
|
||
: (info->name == name))
|
||
{
|
||
/* Yup; check it. */
|
||
check_format_info (info, params);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Check the argument list of a call to printf, scanf, etc.
|
||
INFO points to the function_format_info structure.
|
||
PARAMS is the list of argument values. */
|
||
|
||
static void
|
||
check_format_info (info, params)
|
||
function_format_info *info;
|
||
tree params;
|
||
{
|
||
int i;
|
||
int arg_num;
|
||
int suppressed, wide, precise;
|
||
int length_char = 0;
|
||
int format_char;
|
||
int format_length;
|
||
tree format_tree;
|
||
tree cur_param;
|
||
tree cur_type;
|
||
tree wanted_type;
|
||
tree first_fillin_param;
|
||
char *format_chars;
|
||
format_char_info *fci = NULL;
|
||
char flag_chars[8];
|
||
int has_operand_number = 0;
|
||
|
||
/* Skip to format argument. If the argument isn't available, there's
|
||
no work for us to do; prototype checking will catch the problem. */
|
||
for (arg_num = 1; ; ++arg_num)
|
||
{
|
||
if (params == 0)
|
||
return;
|
||
if (arg_num == info->format_num)
|
||
break;
|
||
params = TREE_CHAIN (params);
|
||
}
|
||
format_tree = TREE_VALUE (params);
|
||
params = TREE_CHAIN (params);
|
||
if (format_tree == 0)
|
||
return;
|
||
|
||
/* We can only check the format if it's a string constant. */
|
||
while (TREE_CODE (format_tree) == NOP_EXPR)
|
||
format_tree = TREE_OPERAND (format_tree, 0); /* strip coercion */
|
||
|
||
if (TREE_CODE (format_tree) == CALL_EXPR
|
||
&& TREE_CODE (TREE_OPERAND (format_tree, 0)) == ADDR_EXPR
|
||
&& (TREE_CODE (TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0))
|
||
== FUNCTION_DECL))
|
||
{
|
||
tree function = TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0);
|
||
|
||
/* See if this is a call to a known internationalization function
|
||
that modifies the format arg. */
|
||
international_format_info *info;
|
||
|
||
for (info = international_format_list; info; info = info->next)
|
||
if (info->assembler_name
|
||
? (info->assembler_name == DECL_ASSEMBLER_NAME (function))
|
||
: (info->name == DECL_NAME (function)))
|
||
{
|
||
tree inner_args;
|
||
int i;
|
||
|
||
for (inner_args = TREE_OPERAND (format_tree, 1), i = 1;
|
||
inner_args != 0;
|
||
inner_args = TREE_CHAIN (inner_args), i++)
|
||
if (i == info->format_num)
|
||
{
|
||
format_tree = TREE_VALUE (inner_args);
|
||
|
||
while (TREE_CODE (format_tree) == NOP_EXPR)
|
||
format_tree = TREE_OPERAND (format_tree, 0);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (integer_zerop (format_tree))
|
||
{
|
||
warning ("null format string");
|
||
return;
|
||
}
|
||
if (TREE_CODE (format_tree) != ADDR_EXPR)
|
||
return;
|
||
format_tree = TREE_OPERAND (format_tree, 0);
|
||
if (TREE_CODE (format_tree) != STRING_CST)
|
||
return;
|
||
format_chars = TREE_STRING_POINTER (format_tree);
|
||
format_length = TREE_STRING_LENGTH (format_tree);
|
||
if (format_length <= 1)
|
||
warning ("zero-length format string");
|
||
if (format_chars[--format_length] != 0)
|
||
{
|
||
warning ("unterminated format string");
|
||
return;
|
||
}
|
||
/* Skip to first argument to check. */
|
||
while (arg_num + 1 < info->first_arg_num)
|
||
{
|
||
if (params == 0)
|
||
return;
|
||
params = TREE_CHAIN (params);
|
||
++arg_num;
|
||
}
|
||
|
||
first_fillin_param = params;
|
||
while (1)
|
||
{
|
||
int aflag;
|
||
if (*format_chars == 0)
|
||
{
|
||
if (format_chars - TREE_STRING_POINTER (format_tree) != format_length)
|
||
warning ("embedded `\\0' in format");
|
||
if (info->first_arg_num != 0 && params != 0 && ! has_operand_number)
|
||
warning ("too many arguments for format");
|
||
return;
|
||
}
|
||
if (*format_chars++ != '%')
|
||
continue;
|
||
if (*format_chars == 0)
|
||
{
|
||
warning ("spurious trailing `%%' in format");
|
||
continue;
|
||
}
|
||
if (*format_chars == '%')
|
||
{
|
||
++format_chars;
|
||
continue;
|
||
}
|
||
flag_chars[0] = 0;
|
||
suppressed = wide = precise = FALSE;
|
||
if (info->format_type == scanf_format_type)
|
||
{
|
||
suppressed = *format_chars == '*';
|
||
if (suppressed)
|
||
++format_chars;
|
||
while (ISDIGIT (*format_chars))
|
||
++format_chars;
|
||
}
|
||
else if (info->format_type == strftime_format_type)
|
||
{
|
||
while (*format_chars != 0 && index ("_-0^#", *format_chars) != 0)
|
||
{
|
||
if (pedantic)
|
||
warning ("ANSI C does not support the strftime `%c' flag",
|
||
*format_chars);
|
||
if (index (flag_chars, *format_chars) != 0)
|
||
{
|
||
warning ("repeated `%c' flag in format",
|
||
*format_chars);
|
||
++format_chars;
|
||
}
|
||
else
|
||
{
|
||
i = strlen (flag_chars);
|
||
flag_chars[i++] = *format_chars++;
|
||
flag_chars[i] = 0;
|
||
}
|
||
}
|
||
while (ISDIGIT ((unsigned char) *format_chars))
|
||
{
|
||
wide = TRUE;
|
||
++format_chars;
|
||
}
|
||
if (wide && pedantic)
|
||
warning ("ANSI C does not support strftime format width");
|
||
if (*format_chars == 'E' || *format_chars == 'O')
|
||
{
|
||
i = strlen (flag_chars);
|
||
flag_chars[i++] = *format_chars++;
|
||
flag_chars[i] = 0;
|
||
if (*format_chars == 'E' || *format_chars == 'O')
|
||
{
|
||
warning ("multiple E/O modifiers in format");
|
||
while (*format_chars == 'E' || *format_chars == 'O')
|
||
++format_chars;
|
||
}
|
||
}
|
||
}
|
||
else if (info->format_type == printf_format_type)
|
||
{
|
||
/* See if we have a number followed by a dollar sign. If we do,
|
||
it is an operand number, so set PARAMS to that operand. */
|
||
if (*format_chars >= '0' && *format_chars <= '9')
|
||
{
|
||
char *p = format_chars;
|
||
|
||
while (*p >= '0' && *p++ <= '9')
|
||
;
|
||
|
||
if (*p == '$')
|
||
{
|
||
int opnum = atoi (format_chars);
|
||
|
||
params = first_fillin_param;
|
||
format_chars = p + 1;
|
||
has_operand_number = 1;
|
||
|
||
for (i = 1; i < opnum && params != 0; i++)
|
||
params = TREE_CHAIN (params);
|
||
|
||
if (opnum == 0 || params == 0)
|
||
{
|
||
warning ("operand number out of range in format");
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
while (*format_chars != 0 && index (" +#0-", *format_chars) != 0)
|
||
{
|
||
if (index (flag_chars, *format_chars) != 0)
|
||
warning ("repeated `%c' flag in format", *format_chars++);
|
||
else
|
||
{
|
||
i = strlen (flag_chars);
|
||
flag_chars[i++] = *format_chars++;
|
||
flag_chars[i] = 0;
|
||
}
|
||
}
|
||
/* "If the space and + flags both appear,
|
||
the space flag will be ignored." */
|
||
if (index (flag_chars, ' ') != 0
|
||
&& index (flag_chars, '+') != 0)
|
||
warning ("use of both ` ' and `+' flags in format");
|
||
/* "If the 0 and - flags both appear,
|
||
the 0 flag will be ignored." */
|
||
if (index (flag_chars, '0') != 0
|
||
&& index (flag_chars, '-') != 0)
|
||
warning ("use of both `0' and `-' flags in format");
|
||
if (*format_chars == '*')
|
||
{
|
||
wide = TRUE;
|
||
/* "...a field width...may be indicated by an asterisk.
|
||
In this case, an int argument supplies the field width..." */
|
||
++format_chars;
|
||
if (params == 0)
|
||
{
|
||
warning (tfaff);
|
||
return;
|
||
}
|
||
if (info->first_arg_num != 0)
|
||
{
|
||
cur_param = TREE_VALUE (params);
|
||
params = TREE_CHAIN (params);
|
||
++arg_num;
|
||
/* size_t is generally not valid here.
|
||
It will work on most machines, because size_t and int
|
||
have the same mode. But might as well warn anyway,
|
||
since it will fail on other machines. */
|
||
if ((TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
|
||
!= integer_type_node)
|
||
&&
|
||
(TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
|
||
!= unsigned_type_node))
|
||
warning ("field width is not type int (arg %d)", arg_num);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
while (ISDIGIT (*format_chars))
|
||
{
|
||
wide = TRUE;
|
||
++format_chars;
|
||
}
|
||
}
|
||
if (*format_chars == '.')
|
||
{
|
||
precise = TRUE;
|
||
++format_chars;
|
||
if (*format_chars != '*' && !ISDIGIT (*format_chars))
|
||
warning ("`.' not followed by `*' or digit in format");
|
||
/* "...a...precision...may be indicated by an asterisk.
|
||
In this case, an int argument supplies the...precision." */
|
||
if (*format_chars == '*')
|
||
{
|
||
if (info->first_arg_num != 0)
|
||
{
|
||
++format_chars;
|
||
if (params == 0)
|
||
{
|
||
warning (tfaff);
|
||
return;
|
||
}
|
||
cur_param = TREE_VALUE (params);
|
||
params = TREE_CHAIN (params);
|
||
++arg_num;
|
||
if (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
|
||
!= integer_type_node)
|
||
warning ("field width is not type int (arg %d)",
|
||
arg_num);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
while (ISDIGIT (*format_chars))
|
||
++format_chars;
|
||
}
|
||
}
|
||
}
|
||
|
||
aflag = 0;
|
||
|
||
if (info->format_type != strftime_format_type)
|
||
{
|
||
if (*format_chars == 'h' || *format_chars == 'l')
|
||
length_char = *format_chars++;
|
||
else if (*format_chars == 'q' || *format_chars == 'L')
|
||
{
|
||
length_char = *format_chars++;
|
||
if (pedantic)
|
||
warning ("ANSI C does not support the `%c' length modifier",
|
||
length_char);
|
||
}
|
||
else if (*format_chars == 'Z')
|
||
{
|
||
length_char = *format_chars++;
|
||
if (pedantic)
|
||
warning ("ANSI C does not support the `Z' length modifier");
|
||
}
|
||
else
|
||
length_char = 0;
|
||
if (length_char == 'l' && *format_chars == 'l')
|
||
{
|
||
length_char = 'q', format_chars++;
|
||
/* FIXME: Is allowed in ISO C 9x. */
|
||
if (pedantic)
|
||
warning ("ANSI C does not support the `ll' length modifier");
|
||
}
|
||
else if (length_char == 'h' && *format_chars == 'h')
|
||
{
|
||
length_char = 'H', format_chars++;
|
||
/* FIXME: Is allowed in ISO C 9x. */
|
||
if (pedantic)
|
||
warning ("ANSI C does not support the `hh' length modifier");
|
||
}
|
||
if (*format_chars == 'a' && info->format_type == scanf_format_type)
|
||
{
|
||
if (format_chars[1] == 's' || format_chars[1] == 'S'
|
||
|| format_chars[1] == '[')
|
||
{
|
||
/* `a' is used as a flag. */
|
||
aflag = 1;
|
||
format_chars++;
|
||
}
|
||
}
|
||
if (suppressed && length_char != 0)
|
||
warning ("use of `*' and `%c' together in format", length_char);
|
||
}
|
||
format_char = *format_chars;
|
||
if (format_char == 0
|
||
|| (info->format_type != strftime_format_type && format_char == '%'))
|
||
{
|
||
warning ("conversion lacks type at end of format");
|
||
continue;
|
||
}
|
||
/* The m, C, and S formats are GNU extensions. */
|
||
if (pedantic && info->format_type != strftime_format_type
|
||
&& (format_char == 'm' || format_char == 'C' || format_char == 'S'))
|
||
warning ("ANSI C does not support the `%c' format", format_char);
|
||
/* ??? The a and A formats are C9X extensions, and should be allowed
|
||
when a C9X option is added. */
|
||
if (pedantic && info->format_type != strftime_format_type
|
||
&& (format_char == 'a' || format_char == 'A'))
|
||
warning ("ANSI C does not support the `%c' format", format_char);
|
||
format_chars++;
|
||
switch (info->format_type)
|
||
{
|
||
case printf_format_type:
|
||
fci = print_char_table;
|
||
break;
|
||
case scanf_format_type:
|
||
fci = scan_char_table;
|
||
break;
|
||
case strftime_format_type:
|
||
fci = time_char_table;
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
while (fci->format_chars != 0
|
||
&& index (fci->format_chars, format_char) == 0)
|
||
++fci;
|
||
if (fci->format_chars == 0)
|
||
{
|
||
if (format_char >= 040 && format_char < 0177)
|
||
warning ("unknown conversion type character `%c' in format",
|
||
format_char);
|
||
else
|
||
warning ("unknown conversion type character 0x%x in format",
|
||
format_char);
|
||
continue;
|
||
}
|
||
if (pedantic)
|
||
{
|
||
if (index (fci->flag_chars, 'G') != 0)
|
||
warning ("ANSI C does not support `%%%c'", format_char);
|
||
if (index (fci->flag_chars, 'o') != 0
|
||
&& index (flag_chars, 'O') != 0)
|
||
warning ("ANSI C does not support `%%O%c'", format_char);
|
||
}
|
||
if (wide && index (fci->flag_chars, 'w') == 0)
|
||
warning ("width used with `%c' format", format_char);
|
||
if (index (fci->flag_chars, '2') != 0)
|
||
warning ("`%%%c' yields only last 2 digits of year", format_char);
|
||
else if (index (fci->flag_chars, '3') != 0)
|
||
warning ("`%%%c' yields only last 2 digits of year in some locales",
|
||
format_char);
|
||
if (precise && index (fci->flag_chars, 'p') == 0)
|
||
warning ("precision used with `%c' format", format_char);
|
||
if (aflag && index (fci->flag_chars, 'a') == 0)
|
||
{
|
||
warning ("`a' flag used with `%c' format", format_char);
|
||
/* To simplify the following code. */
|
||
aflag = 0;
|
||
}
|
||
/* The a flag is a GNU extension. */
|
||
else if (pedantic && aflag)
|
||
warning ("ANSI C does not support the `a' flag");
|
||
if (info->format_type == scanf_format_type && format_char == '[')
|
||
{
|
||
/* Skip over scan set, in case it happens to have '%' in it. */
|
||
if (*format_chars == '^')
|
||
++format_chars;
|
||
/* Find closing bracket; if one is hit immediately, then
|
||
it's part of the scan set rather than a terminator. */
|
||
if (*format_chars == ']')
|
||
++format_chars;
|
||
while (*format_chars && *format_chars != ']')
|
||
++format_chars;
|
||
if (*format_chars != ']')
|
||
/* The end of the format string was reached. */
|
||
warning ("no closing `]' for `%%[' format");
|
||
}
|
||
if (suppressed)
|
||
{
|
||
if (index (fci->flag_chars, '*') == 0)
|
||
warning ("suppression of `%c' conversion in format", format_char);
|
||
continue;
|
||
}
|
||
for (i = 0; flag_chars[i] != 0; ++i)
|
||
{
|
||
if (index (fci->flag_chars, flag_chars[i]) == 0)
|
||
warning ("flag `%c' used with type `%c'",
|
||
flag_chars[i], format_char);
|
||
}
|
||
if (info->format_type == strftime_format_type)
|
||
continue;
|
||
if (precise && index (flag_chars, '0') != 0
|
||
&& (format_char == 'd' || format_char == 'i'
|
||
|| format_char == 'o' || format_char == 'u'
|
||
|| format_char == 'x' || format_char == 'X'))
|
||
warning ("`0' flag ignored with precision specifier and `%c' format",
|
||
format_char);
|
||
switch (length_char)
|
||
{
|
||
default: wanted_type = fci->nolen ? *(fci->nolen) : 0; break;
|
||
case 'H': wanted_type = fci->hhlen ? *(fci->hhlen) : 0; break;
|
||
case 'h': wanted_type = fci->hlen ? *(fci->hlen) : 0; break;
|
||
case 'l': wanted_type = fci->llen ? *(fci->llen) : 0; break;
|
||
case 'q': wanted_type = fci->qlen ? *(fci->qlen) : 0; break;
|
||
case 'L': wanted_type = fci->bigllen ? *(fci->bigllen) : 0; break;
|
||
case 'Z': wanted_type = fci->zlen ? *fci->zlen : 0; break;
|
||
}
|
||
if (wanted_type == 0)
|
||
warning ("use of `%c' length character with `%c' type character",
|
||
length_char, format_char);
|
||
|
||
/* Finally. . .check type of argument against desired type! */
|
||
if (info->first_arg_num == 0)
|
||
continue;
|
||
if (fci->pointer_count == 0 && wanted_type == void_type_node)
|
||
/* This specifier takes no argument. */
|
||
continue;
|
||
if (params == 0)
|
||
{
|
||
warning (tfaff);
|
||
return;
|
||
}
|
||
cur_param = TREE_VALUE (params);
|
||
params = TREE_CHAIN (params);
|
||
++arg_num;
|
||
cur_type = TREE_TYPE (cur_param);
|
||
|
||
STRIP_NOPS (cur_param);
|
||
|
||
/* Check the types of any additional pointer arguments
|
||
that precede the "real" argument. */
|
||
for (i = 0; i < fci->pointer_count + aflag; ++i)
|
||
{
|
||
if (TREE_CODE (cur_type) == POINTER_TYPE)
|
||
{
|
||
cur_type = TREE_TYPE (cur_type);
|
||
|
||
if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
|
||
cur_param = TREE_OPERAND (cur_param, 0);
|
||
else
|
||
cur_param = 0;
|
||
|
||
continue;
|
||
}
|
||
if (TREE_CODE (cur_type) != ERROR_MARK)
|
||
warning ("format argument is not a %s (arg %d)",
|
||
((fci->pointer_count + aflag == 1)
|
||
? "pointer" : "pointer to a pointer"),
|
||
arg_num);
|
||
break;
|
||
}
|
||
|
||
/* See if this is an attempt to write into a const type with
|
||
scanf or with printf "%n". */
|
||
if ((info->format_type == scanf_format_type
|
||
|| (info->format_type == printf_format_type
|
||
&& format_char == 'n'))
|
||
&& i == fci->pointer_count + aflag
|
||
&& wanted_type != 0
|
||
&& TREE_CODE (cur_type) != ERROR_MARK
|
||
&& (TYPE_READONLY (cur_type)
|
||
|| (cur_param != 0
|
||
&& (TREE_CODE_CLASS (TREE_CODE (cur_param)) == 'c'
|
||
|| (TREE_CODE_CLASS (TREE_CODE (cur_param)) == 'd'
|
||
&& TREE_READONLY (cur_param))))))
|
||
warning ("writing into constant object (arg %d)", arg_num);
|
||
|
||
/* Check the type of the "real" argument, if there's a type we want. */
|
||
if (i == fci->pointer_count + aflag && wanted_type != 0
|
||
&& TREE_CODE (cur_type) != ERROR_MARK
|
||
&& wanted_type != TYPE_MAIN_VARIANT (cur_type)
|
||
/* If we want `void *', allow any pointer type.
|
||
(Anything else would already have got a warning.) */
|
||
&& ! (wanted_type == void_type_node
|
||
&& fci->pointer_count > 0)
|
||
/* Don't warn about differences merely in signedness. */
|
||
&& !(TREE_CODE (wanted_type) == INTEGER_TYPE
|
||
&& TREE_CODE (TYPE_MAIN_VARIANT (cur_type)) == INTEGER_TYPE
|
||
&& (TREE_UNSIGNED (wanted_type)
|
||
? wanted_type == (cur_type = unsigned_type (cur_type))
|
||
: wanted_type == (cur_type = signed_type (cur_type))))
|
||
/* Likewise, "signed char", "unsigned char" and "char" are
|
||
equivalent but the above test won't consider them equivalent. */
|
||
&& ! (wanted_type == char_type_node
|
||
&& (TYPE_MAIN_VARIANT (cur_type) == signed_char_type_node
|
||
|| TYPE_MAIN_VARIANT (cur_type) == unsigned_char_type_node)))
|
||
{
|
||
register char *this;
|
||
register char *that;
|
||
|
||
this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type)));
|
||
that = 0;
|
||
if (TREE_CODE (cur_type) != ERROR_MARK
|
||
&& TYPE_NAME (cur_type) != 0
|
||
&& TREE_CODE (cur_type) != INTEGER_TYPE
|
||
&& !(TREE_CODE (cur_type) == POINTER_TYPE
|
||
&& TREE_CODE (TREE_TYPE (cur_type)) == INTEGER_TYPE))
|
||
{
|
||
if (TREE_CODE (TYPE_NAME (cur_type)) == TYPE_DECL
|
||
&& DECL_NAME (TYPE_NAME (cur_type)) != 0)
|
||
that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (cur_type)));
|
||
else
|
||
that = IDENTIFIER_POINTER (TYPE_NAME (cur_type));
|
||
}
|
||
|
||
/* A nameless type can't possibly match what the format wants.
|
||
So there will be a warning for it.
|
||
Make up a string to describe vaguely what it is. */
|
||
if (that == 0)
|
||
{
|
||
if (TREE_CODE (cur_type) == POINTER_TYPE)
|
||
that = "pointer";
|
||
else
|
||
that = "different type";
|
||
}
|
||
|
||
/* Make the warning better in case of mismatch of int vs long. */
|
||
if (TREE_CODE (cur_type) == INTEGER_TYPE
|
||
&& TREE_CODE (wanted_type) == INTEGER_TYPE
|
||
&& TYPE_PRECISION (cur_type) == TYPE_PRECISION (wanted_type)
|
||
&& TYPE_NAME (cur_type) != 0
|
||
&& TREE_CODE (TYPE_NAME (cur_type)) == TYPE_DECL)
|
||
that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (cur_type)));
|
||
|
||
if (strcmp (this, that) != 0)
|
||
warning ("%s format, %s arg (arg %d)", this, that, arg_num);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Print a warning if a constant expression had overflow in folding.
|
||
Invoke this function on every expression that the language
|
||
requires to be a constant expression.
|
||
Note the ANSI C standard says it is erroneous for a
|
||
constant expression to overflow. */
|
||
|
||
void
|
||
constant_expression_warning (value)
|
||
tree value;
|
||
{
|
||
if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
|
||
|| TREE_CODE (value) == COMPLEX_CST)
|
||
&& TREE_CONSTANT_OVERFLOW (value) && pedantic)
|
||
pedwarn ("overflow in constant expression");
|
||
}
|
||
|
||
/* Print a warning if an expression had overflow in folding.
|
||
Invoke this function on every expression that
|
||
(1) appears in the source code, and
|
||
(2) might be a constant expression that overflowed, and
|
||
(3) is not already checked by convert_and_check;
|
||
however, do not invoke this function on operands of explicit casts. */
|
||
|
||
void
|
||
overflow_warning (value)
|
||
tree value;
|
||
{
|
||
if ((TREE_CODE (value) == INTEGER_CST
|
||
|| (TREE_CODE (value) == COMPLEX_CST
|
||
&& TREE_CODE (TREE_REALPART (value)) == INTEGER_CST))
|
||
&& TREE_OVERFLOW (value))
|
||
{
|
||
TREE_OVERFLOW (value) = 0;
|
||
if (skip_evaluation == 0)
|
||
warning ("integer overflow in expression");
|
||
}
|
||
else if ((TREE_CODE (value) == REAL_CST
|
||
|| (TREE_CODE (value) == COMPLEX_CST
|
||
&& TREE_CODE (TREE_REALPART (value)) == REAL_CST))
|
||
&& TREE_OVERFLOW (value))
|
||
{
|
||
TREE_OVERFLOW (value) = 0;
|
||
if (skip_evaluation == 0)
|
||
warning ("floating point overflow in expression");
|
||
}
|
||
}
|
||
|
||
/* Print a warning if a large constant is truncated to unsigned,
|
||
or if -Wconversion is used and a constant < 0 is converted to unsigned.
|
||
Invoke this function on every expression that might be implicitly
|
||
converted to an unsigned type. */
|
||
|
||
void
|
||
unsigned_conversion_warning (result, operand)
|
||
tree result, operand;
|
||
{
|
||
if (TREE_CODE (operand) == INTEGER_CST
|
||
&& TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE
|
||
&& TREE_UNSIGNED (TREE_TYPE (result))
|
||
&& skip_evaluation == 0
|
||
&& !int_fits_type_p (operand, TREE_TYPE (result)))
|
||
{
|
||
if (!int_fits_type_p (operand, signed_type (TREE_TYPE (result))))
|
||
/* This detects cases like converting -129 or 256 to unsigned char. */
|
||
warning ("large integer implicitly truncated to unsigned type");
|
||
else if (warn_conversion)
|
||
warning ("negative integer implicitly converted to unsigned type");
|
||
}
|
||
}
|
||
|
||
/* Convert EXPR to TYPE, warning about conversion problems with constants.
|
||
Invoke this function on every expression that is converted implicitly,
|
||
i.e. because of language rules and not because of an explicit cast. */
|
||
|
||
tree
|
||
convert_and_check (type, expr)
|
||
tree type, expr;
|
||
{
|
||
tree t = convert (type, expr);
|
||
if (TREE_CODE (t) == INTEGER_CST)
|
||
{
|
||
if (TREE_OVERFLOW (t))
|
||
{
|
||
TREE_OVERFLOW (t) = 0;
|
||
|
||
/* Do not diagnose overflow in a constant expression merely
|
||
because a conversion overflowed. */
|
||
TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr);
|
||
|
||
/* No warning for converting 0x80000000 to int. */
|
||
if (!(TREE_UNSIGNED (type) < TREE_UNSIGNED (TREE_TYPE (expr))
|
||
&& TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
|
||
&& TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
|
||
/* If EXPR fits in the unsigned version of TYPE,
|
||
don't warn unless pedantic. */
|
||
if ((pedantic
|
||
|| TREE_UNSIGNED (type)
|
||
|| ! int_fits_type_p (expr, unsigned_type (type)))
|
||
&& skip_evaluation == 0)
|
||
warning ("overflow in implicit constant conversion");
|
||
}
|
||
else
|
||
unsigned_conversion_warning (t, expr);
|
||
}
|
||
return t;
|
||
}
|
||
|
||
void
|
||
c_expand_expr_stmt (expr)
|
||
tree expr;
|
||
{
|
||
/* Do default conversion if safe and possibly important,
|
||
in case within ({...}). */
|
||
if ((TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE && lvalue_p (expr))
|
||
|| TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE)
|
||
expr = default_conversion (expr);
|
||
|
||
if (TREE_TYPE (expr) != error_mark_node
|
||
&& TYPE_SIZE (TREE_TYPE (expr)) == 0
|
||
&& TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
|
||
error ("expression statement has incomplete type");
|
||
|
||
expand_expr_stmt (expr);
|
||
}
|
||
|
||
/* Validate the expression after `case' and apply default promotions. */
|
||
|
||
tree
|
||
check_case_value (value)
|
||
tree value;
|
||
{
|
||
if (value == NULL_TREE)
|
||
return value;
|
||
|
||
/* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
|
||
STRIP_TYPE_NOPS (value);
|
||
|
||
if (TREE_CODE (value) != INTEGER_CST
|
||
&& value != error_mark_node)
|
||
{
|
||
error ("case label does not reduce to an integer constant");
|
||
value = error_mark_node;
|
||
}
|
||
else
|
||
/* Promote char or short to int. */
|
||
value = default_conversion (value);
|
||
|
||
constant_expression_warning (value);
|
||
|
||
return value;
|
||
}
|
||
|
||
/* Return an integer type with BITS bits of precision,
|
||
that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
|
||
|
||
tree
|
||
type_for_size (bits, unsignedp)
|
||
unsigned bits;
|
||
int unsignedp;
|
||
{
|
||
if (bits == TYPE_PRECISION (integer_type_node))
|
||
return unsignedp ? unsigned_type_node : integer_type_node;
|
||
|
||
if (bits == TYPE_PRECISION (signed_char_type_node))
|
||
return unsignedp ? unsigned_char_type_node : signed_char_type_node;
|
||
|
||
if (bits == TYPE_PRECISION (short_integer_type_node))
|
||
return unsignedp ? short_unsigned_type_node : short_integer_type_node;
|
||
|
||
if (bits == TYPE_PRECISION (long_integer_type_node))
|
||
return unsignedp ? long_unsigned_type_node : long_integer_type_node;
|
||
|
||
if (bits == TYPE_PRECISION (long_long_integer_type_node))
|
||
return (unsignedp ? long_long_unsigned_type_node
|
||
: long_long_integer_type_node);
|
||
|
||
if (bits <= TYPE_PRECISION (intQI_type_node))
|
||
return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
|
||
|
||
if (bits <= TYPE_PRECISION (intHI_type_node))
|
||
return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
|
||
|
||
if (bits <= TYPE_PRECISION (intSI_type_node))
|
||
return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
|
||
|
||
if (bits <= TYPE_PRECISION (intDI_type_node))
|
||
return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Return a data type that has machine mode MODE.
|
||
If the mode is an integer,
|
||
then UNSIGNEDP selects between signed and unsigned types. */
|
||
|
||
tree
|
||
type_for_mode (mode, unsignedp)
|
||
enum machine_mode mode;
|
||
int unsignedp;
|
||
{
|
||
if (mode == TYPE_MODE (integer_type_node))
|
||
return unsignedp ? unsigned_type_node : integer_type_node;
|
||
|
||
if (mode == TYPE_MODE (signed_char_type_node))
|
||
return unsignedp ? unsigned_char_type_node : signed_char_type_node;
|
||
|
||
if (mode == TYPE_MODE (short_integer_type_node))
|
||
return unsignedp ? short_unsigned_type_node : short_integer_type_node;
|
||
|
||
if (mode == TYPE_MODE (long_integer_type_node))
|
||
return unsignedp ? long_unsigned_type_node : long_integer_type_node;
|
||
|
||
if (mode == TYPE_MODE (long_long_integer_type_node))
|
||
return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
|
||
|
||
if (mode == TYPE_MODE (intQI_type_node))
|
||
return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
|
||
|
||
if (mode == TYPE_MODE (intHI_type_node))
|
||
return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
|
||
|
||
if (mode == TYPE_MODE (intSI_type_node))
|
||
return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
|
||
|
||
if (mode == TYPE_MODE (intDI_type_node))
|
||
return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
|
||
|
||
#if HOST_BITS_PER_WIDE_INT >= 64
|
||
if (mode == TYPE_MODE (intTI_type_node))
|
||
return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
|
||
#endif
|
||
|
||
if (mode == TYPE_MODE (float_type_node))
|
||
return float_type_node;
|
||
|
||
if (mode == TYPE_MODE (double_type_node))
|
||
return double_type_node;
|
||
|
||
if (mode == TYPE_MODE (long_double_type_node))
|
||
return long_double_type_node;
|
||
|
||
if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
|
||
return build_pointer_type (char_type_node);
|
||
|
||
if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
|
||
return build_pointer_type (integer_type_node);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Return the minimum number of bits needed to represent VALUE in a
|
||
signed or unsigned type, UNSIGNEDP says which. */
|
||
|
||
int
|
||
min_precision (value, unsignedp)
|
||
tree value;
|
||
int unsignedp;
|
||
{
|
||
int log;
|
||
|
||
/* If the value is negative, compute its negative minus 1. The latter
|
||
adjustment is because the absolute value of the largest negative value
|
||
is one larger than the largest positive value. This is equivalent to
|
||
a bit-wise negation, so use that operation instead. */
|
||
|
||
if (tree_int_cst_sgn (value) < 0)
|
||
value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value));
|
||
|
||
/* Return the number of bits needed, taking into account the fact
|
||
that we need one more bit for a signed than unsigned type. */
|
||
|
||
if (integer_zerop (value))
|
||
log = 0;
|
||
else if (TREE_INT_CST_HIGH (value) != 0)
|
||
log = HOST_BITS_PER_WIDE_INT + floor_log2 (TREE_INT_CST_HIGH (value));
|
||
else
|
||
log = floor_log2 (TREE_INT_CST_LOW (value));
|
||
|
||
return log + 1 + ! unsignedp;
|
||
}
|
||
|
||
/* Print an error message for invalid operands to arith operation CODE.
|
||
NOP_EXPR is used as a special case (see truthvalue_conversion). */
|
||
|
||
void
|
||
binary_op_error (code)
|
||
enum tree_code code;
|
||
{
|
||
register char *opname;
|
||
|
||
switch (code)
|
||
{
|
||
case NOP_EXPR:
|
||
error ("invalid truth-value expression");
|
||
return;
|
||
|
||
case PLUS_EXPR:
|
||
opname = "+"; break;
|
||
case MINUS_EXPR:
|
||
opname = "-"; break;
|
||
case MULT_EXPR:
|
||
opname = "*"; break;
|
||
case MAX_EXPR:
|
||
opname = "max"; break;
|
||
case MIN_EXPR:
|
||
opname = "min"; break;
|
||
case EQ_EXPR:
|
||
opname = "=="; break;
|
||
case NE_EXPR:
|
||
opname = "!="; break;
|
||
case LE_EXPR:
|
||
opname = "<="; break;
|
||
case GE_EXPR:
|
||
opname = ">="; break;
|
||
case LT_EXPR:
|
||
opname = "<"; break;
|
||
case GT_EXPR:
|
||
opname = ">"; break;
|
||
case LSHIFT_EXPR:
|
||
opname = "<<"; break;
|
||
case RSHIFT_EXPR:
|
||
opname = ">>"; break;
|
||
case TRUNC_MOD_EXPR:
|
||
case FLOOR_MOD_EXPR:
|
||
opname = "%"; break;
|
||
case TRUNC_DIV_EXPR:
|
||
case FLOOR_DIV_EXPR:
|
||
opname = "/"; break;
|
||
case BIT_AND_EXPR:
|
||
opname = "&"; break;
|
||
case BIT_IOR_EXPR:
|
||
opname = "|"; break;
|
||
case TRUTH_ANDIF_EXPR:
|
||
opname = "&&"; break;
|
||
case TRUTH_ORIF_EXPR:
|
||
opname = "||"; break;
|
||
case BIT_XOR_EXPR:
|
||
opname = "^"; break;
|
||
case LROTATE_EXPR:
|
||
case RROTATE_EXPR:
|
||
opname = "rotate"; break;
|
||
default:
|
||
opname = "unknown"; break;
|
||
}
|
||
error ("invalid operands to binary %s", opname);
|
||
}
|
||
|
||
/* Subroutine of build_binary_op, used for comparison operations.
|
||
See if the operands have both been converted from subword integer types
|
||
and, if so, perhaps change them both back to their original type.
|
||
This function is also responsible for converting the two operands
|
||
to the proper common type for comparison.
|
||
|
||
The arguments of this function are all pointers to local variables
|
||
of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
|
||
RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
|
||
|
||
If this function returns nonzero, it means that the comparison has
|
||
a constant value. What this function returns is an expression for
|
||
that value. */
|
||
|
||
tree
|
||
shorten_compare (op0_ptr, op1_ptr, restype_ptr, rescode_ptr)
|
||
tree *op0_ptr, *op1_ptr;
|
||
tree *restype_ptr;
|
||
enum tree_code *rescode_ptr;
|
||
{
|
||
register tree type;
|
||
tree op0 = *op0_ptr;
|
||
tree op1 = *op1_ptr;
|
||
int unsignedp0, unsignedp1;
|
||
int real1, real2;
|
||
tree primop0, primop1;
|
||
enum tree_code code = *rescode_ptr;
|
||
|
||
/* Throw away any conversions to wider types
|
||
already present in the operands. */
|
||
|
||
primop0 = get_narrower (op0, &unsignedp0);
|
||
primop1 = get_narrower (op1, &unsignedp1);
|
||
|
||
/* Handle the case that OP0 does not *contain* a conversion
|
||
but it *requires* conversion to FINAL_TYPE. */
|
||
|
||
if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
|
||
unsignedp0 = TREE_UNSIGNED (TREE_TYPE (op0));
|
||
if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
|
||
unsignedp1 = TREE_UNSIGNED (TREE_TYPE (op1));
|
||
|
||
/* If one of the operands must be floated, we cannot optimize. */
|
||
real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
|
||
real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
|
||
|
||
/* If first arg is constant, swap the args (changing operation
|
||
so value is preserved), for canonicalization. Don't do this if
|
||
the second arg is 0. */
|
||
|
||
if (TREE_CONSTANT (primop0)
|
||
&& ! integer_zerop (primop1) && ! real_zerop (primop1))
|
||
{
|
||
register tree tem = primop0;
|
||
register int temi = unsignedp0;
|
||
primop0 = primop1;
|
||
primop1 = tem;
|
||
tem = op0;
|
||
op0 = op1;
|
||
op1 = tem;
|
||
*op0_ptr = op0;
|
||
*op1_ptr = op1;
|
||
unsignedp0 = unsignedp1;
|
||
unsignedp1 = temi;
|
||
temi = real1;
|
||
real1 = real2;
|
||
real2 = temi;
|
||
|
||
switch (code)
|
||
{
|
||
case LT_EXPR:
|
||
code = GT_EXPR;
|
||
break;
|
||
case GT_EXPR:
|
||
code = LT_EXPR;
|
||
break;
|
||
case LE_EXPR:
|
||
code = GE_EXPR;
|
||
break;
|
||
case GE_EXPR:
|
||
code = LE_EXPR;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
*rescode_ptr = code;
|
||
}
|
||
|
||
/* If comparing an integer against a constant more bits wide,
|
||
maybe we can deduce a value of 1 or 0 independent of the data.
|
||
Or else truncate the constant now
|
||
rather than extend the variable at run time.
|
||
|
||
This is only interesting if the constant is the wider arg.
|
||
Also, it is not safe if the constant is unsigned and the
|
||
variable arg is signed, since in this case the variable
|
||
would be sign-extended and then regarded as unsigned.
|
||
Our technique fails in this case because the lowest/highest
|
||
possible unsigned results don't follow naturally from the
|
||
lowest/highest possible values of the variable operand.
|
||
For just EQ_EXPR and NE_EXPR there is another technique that
|
||
could be used: see if the constant can be faithfully represented
|
||
in the other operand's type, by truncating it and reextending it
|
||
and see if that preserves the constant's value. */
|
||
|
||
if (!real1 && !real2
|
||
&& TREE_CODE (primop1) == INTEGER_CST
|
||
&& TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
|
||
{
|
||
int min_gt, max_gt, min_lt, max_lt;
|
||
tree maxval, minval;
|
||
/* 1 if comparison is nominally unsigned. */
|
||
int unsignedp = TREE_UNSIGNED (*restype_ptr);
|
||
tree val;
|
||
|
||
type = signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0));
|
||
|
||
maxval = TYPE_MAX_VALUE (type);
|
||
minval = TYPE_MIN_VALUE (type);
|
||
|
||
if (unsignedp && !unsignedp0)
|
||
*restype_ptr = signed_type (*restype_ptr);
|
||
|
||
if (TREE_TYPE (primop1) != *restype_ptr)
|
||
primop1 = convert (*restype_ptr, primop1);
|
||
if (type != *restype_ptr)
|
||
{
|
||
minval = convert (*restype_ptr, minval);
|
||
maxval = convert (*restype_ptr, maxval);
|
||
}
|
||
|
||
if (unsignedp && unsignedp0)
|
||
{
|
||
min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
|
||
max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
|
||
min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
|
||
max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
|
||
}
|
||
else
|
||
{
|
||
min_gt = INT_CST_LT (primop1, minval);
|
||
max_gt = INT_CST_LT (primop1, maxval);
|
||
min_lt = INT_CST_LT (minval, primop1);
|
||
max_lt = INT_CST_LT (maxval, primop1);
|
||
}
|
||
|
||
val = 0;
|
||
/* This used to be a switch, but Genix compiler can't handle that. */
|
||
if (code == NE_EXPR)
|
||
{
|
||
if (max_lt || min_gt)
|
||
val = boolean_true_node;
|
||
}
|
||
else if (code == EQ_EXPR)
|
||
{
|
||
if (max_lt || min_gt)
|
||
val = boolean_false_node;
|
||
}
|
||
else if (code == LT_EXPR)
|
||
{
|
||
if (max_lt)
|
||
val = boolean_true_node;
|
||
if (!min_lt)
|
||
val = boolean_false_node;
|
||
}
|
||
else if (code == GT_EXPR)
|
||
{
|
||
if (min_gt)
|
||
val = boolean_true_node;
|
||
if (!max_gt)
|
||
val = boolean_false_node;
|
||
}
|
||
else if (code == LE_EXPR)
|
||
{
|
||
if (!max_gt)
|
||
val = boolean_true_node;
|
||
if (min_gt)
|
||
val = boolean_false_node;
|
||
}
|
||
else if (code == GE_EXPR)
|
||
{
|
||
if (!min_lt)
|
||
val = boolean_true_node;
|
||
if (max_lt)
|
||
val = boolean_false_node;
|
||
}
|
||
|
||
/* If primop0 was sign-extended and unsigned comparison specd,
|
||
we did a signed comparison above using the signed type bounds.
|
||
But the comparison we output must be unsigned.
|
||
|
||
Also, for inequalities, VAL is no good; but if the signed
|
||
comparison had *any* fixed result, it follows that the
|
||
unsigned comparison just tests the sign in reverse
|
||
(positive values are LE, negative ones GE).
|
||
So we can generate an unsigned comparison
|
||
against an extreme value of the signed type. */
|
||
|
||
if (unsignedp && !unsignedp0)
|
||
{
|
||
if (val != 0)
|
||
switch (code)
|
||
{
|
||
case LT_EXPR:
|
||
case GE_EXPR:
|
||
primop1 = TYPE_MIN_VALUE (type);
|
||
val = 0;
|
||
break;
|
||
|
||
case LE_EXPR:
|
||
case GT_EXPR:
|
||
primop1 = TYPE_MAX_VALUE (type);
|
||
val = 0;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
type = unsigned_type (type);
|
||
}
|
||
|
||
if (!max_gt && !unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
|
||
{
|
||
/* This is the case of (char)x >?< 0x80, which people used to use
|
||
expecting old C compilers to change the 0x80 into -0x80. */
|
||
if (val == boolean_false_node)
|
||
warning ("comparison is always 0 due to limited range of data type");
|
||
if (val == boolean_true_node)
|
||
warning ("comparison is always 1 due to limited range of data type");
|
||
}
|
||
|
||
if (!min_lt && unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
|
||
{
|
||
/* This is the case of (unsigned char)x >?< -1 or < 0. */
|
||
if (val == boolean_false_node)
|
||
warning ("comparison is always 0 due to limited range of data type");
|
||
if (val == boolean_true_node)
|
||
warning ("comparison is always 1 due to limited range of data type");
|
||
}
|
||
|
||
if (val != 0)
|
||
{
|
||
/* Don't forget to evaluate PRIMOP0 if it has side effects. */
|
||
if (TREE_SIDE_EFFECTS (primop0))
|
||
return build (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
|
||
return val;
|
||
}
|
||
|
||
/* Value is not predetermined, but do the comparison
|
||
in the type of the operand that is not constant.
|
||
TYPE is already properly set. */
|
||
}
|
||
else if (real1 && real2
|
||
&& (TYPE_PRECISION (TREE_TYPE (primop0))
|
||
== TYPE_PRECISION (TREE_TYPE (primop1))))
|
||
type = TREE_TYPE (primop0);
|
||
|
||
/* If args' natural types are both narrower than nominal type
|
||
and both extend in the same manner, compare them
|
||
in the type of the wider arg.
|
||
Otherwise must actually extend both to the nominal
|
||
common type lest different ways of extending
|
||
alter the result.
|
||
(eg, (short)-1 == (unsigned short)-1 should be 0.) */
|
||
|
||
else if (unsignedp0 == unsignedp1 && real1 == real2
|
||
&& TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
|
||
&& TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
|
||
{
|
||
type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
|
||
type = signed_or_unsigned_type (unsignedp0
|
||
|| TREE_UNSIGNED (*restype_ptr),
|
||
type);
|
||
/* Make sure shorter operand is extended the right way
|
||
to match the longer operand. */
|
||
primop0 = convert (signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0)),
|
||
primop0);
|
||
primop1 = convert (signed_or_unsigned_type (unsignedp1, TREE_TYPE (primop1)),
|
||
primop1);
|
||
}
|
||
else
|
||
{
|
||
/* Here we must do the comparison on the nominal type
|
||
using the args exactly as we received them. */
|
||
type = *restype_ptr;
|
||
primop0 = op0;
|
||
primop1 = op1;
|
||
|
||
if (!real1 && !real2 && integer_zerop (primop1)
|
||
&& TREE_UNSIGNED (*restype_ptr))
|
||
{
|
||
tree value = 0;
|
||
switch (code)
|
||
{
|
||
case GE_EXPR:
|
||
/* All unsigned values are >= 0, so we warn if extra warnings
|
||
are requested. However, if OP0 is a constant that is
|
||
>= 0, the signedness of the comparison isn't an issue,
|
||
so suppress the warning. */
|
||
if (extra_warnings
|
||
&& ! (TREE_CODE (primop0) == INTEGER_CST
|
||
&& ! TREE_OVERFLOW (convert (signed_type (type),
|
||
primop0))))
|
||
warning ("unsigned value >= 0 is always 1");
|
||
value = boolean_true_node;
|
||
break;
|
||
|
||
case LT_EXPR:
|
||
if (extra_warnings
|
||
&& ! (TREE_CODE (primop0) == INTEGER_CST
|
||
&& ! TREE_OVERFLOW (convert (signed_type (type),
|
||
primop0))))
|
||
warning ("unsigned value < 0 is always 0");
|
||
value = boolean_false_node;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
if (value != 0)
|
||
{
|
||
/* Don't forget to evaluate PRIMOP0 if it has side effects. */
|
||
if (TREE_SIDE_EFFECTS (primop0))
|
||
return build (COMPOUND_EXPR, TREE_TYPE (value),
|
||
primop0, value);
|
||
return value;
|
||
}
|
||
}
|
||
}
|
||
|
||
*op0_ptr = convert (type, primop0);
|
||
*op1_ptr = convert (type, primop1);
|
||
|
||
*restype_ptr = boolean_type_node;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
|
||
or validate its data type for an `if' or `while' statement or ?..: exp.
|
||
|
||
This preparation consists of taking the ordinary
|
||
representation of an expression expr and producing a valid tree
|
||
boolean expression describing whether expr is nonzero. We could
|
||
simply always do build_binary_op (NE_EXPR, expr, boolean_false_node, 1),
|
||
but we optimize comparisons, &&, ||, and !.
|
||
|
||
The resulting type should always be `boolean_type_node'. */
|
||
|
||
tree
|
||
truthvalue_conversion (expr)
|
||
tree expr;
|
||
{
|
||
if (TREE_CODE (expr) == ERROR_MARK)
|
||
return expr;
|
||
|
||
#if 0 /* This appears to be wrong for C++. */
|
||
/* These really should return error_mark_node after 2.4 is stable.
|
||
But not all callers handle ERROR_MARK properly. */
|
||
switch (TREE_CODE (TREE_TYPE (expr)))
|
||
{
|
||
case RECORD_TYPE:
|
||
error ("struct type value used where scalar is required");
|
||
return boolean_false_node;
|
||
|
||
case UNION_TYPE:
|
||
error ("union type value used where scalar is required");
|
||
return boolean_false_node;
|
||
|
||
case ARRAY_TYPE:
|
||
error ("array type value used where scalar is required");
|
||
return boolean_false_node;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
#endif /* 0 */
|
||
|
||
switch (TREE_CODE (expr))
|
||
{
|
||
/* It is simpler and generates better code to have only TRUTH_*_EXPR
|
||
or comparison expressions as truth values at this level. */
|
||
#if 0
|
||
case COMPONENT_REF:
|
||
/* A one-bit unsigned bit-field is already acceptable. */
|
||
if (1 == TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (expr, 1)))
|
||
&& TREE_UNSIGNED (TREE_OPERAND (expr, 1)))
|
||
return expr;
|
||
break;
|
||
#endif
|
||
|
||
case EQ_EXPR:
|
||
/* It is simpler and generates better code to have only TRUTH_*_EXPR
|
||
or comparison expressions as truth values at this level. */
|
||
#if 0
|
||
if (integer_zerop (TREE_OPERAND (expr, 1)))
|
||
return build_unary_op (TRUTH_NOT_EXPR, TREE_OPERAND (expr, 0), 0);
|
||
#endif
|
||
case NE_EXPR: case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
|
||
case TRUTH_ANDIF_EXPR:
|
||
case TRUTH_ORIF_EXPR:
|
||
case TRUTH_AND_EXPR:
|
||
case TRUTH_OR_EXPR:
|
||
case TRUTH_XOR_EXPR:
|
||
case TRUTH_NOT_EXPR:
|
||
TREE_TYPE (expr) = boolean_type_node;
|
||
return expr;
|
||
|
||
case ERROR_MARK:
|
||
return expr;
|
||
|
||
case INTEGER_CST:
|
||
return integer_zerop (expr) ? boolean_false_node : boolean_true_node;
|
||
|
||
case REAL_CST:
|
||
return real_zerop (expr) ? boolean_false_node : boolean_true_node;
|
||
|
||
case ADDR_EXPR:
|
||
/* If we are taking the address of a external decl, it might be zero
|
||
if it is weak, so we cannot optimize. */
|
||
if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (expr, 0))) == 'd'
|
||
&& DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
|
||
break;
|
||
|
||
if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
|
||
return build (COMPOUND_EXPR, boolean_type_node,
|
||
TREE_OPERAND (expr, 0), boolean_true_node);
|
||
else
|
||
return boolean_true_node;
|
||
|
||
case COMPLEX_EXPR:
|
||
return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
|
||
? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
|
||
truthvalue_conversion (TREE_OPERAND (expr, 0)),
|
||
truthvalue_conversion (TREE_OPERAND (expr, 1)),
|
||
0);
|
||
|
||
case NEGATE_EXPR:
|
||
case ABS_EXPR:
|
||
case FLOAT_EXPR:
|
||
case FFS_EXPR:
|
||
/* These don't change whether an object is non-zero or zero. */
|
||
return truthvalue_conversion (TREE_OPERAND (expr, 0));
|
||
|
||
case LROTATE_EXPR:
|
||
case RROTATE_EXPR:
|
||
/* These don't change whether an object is zero or non-zero, but
|
||
we can't ignore them if their second arg has side-effects. */
|
||
if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
|
||
return build (COMPOUND_EXPR, boolean_type_node, TREE_OPERAND (expr, 1),
|
||
truthvalue_conversion (TREE_OPERAND (expr, 0)));
|
||
else
|
||
return truthvalue_conversion (TREE_OPERAND (expr, 0));
|
||
|
||
case COND_EXPR:
|
||
/* Distribute the conversion into the arms of a COND_EXPR. */
|
||
return fold (build (COND_EXPR, boolean_type_node, TREE_OPERAND (expr, 0),
|
||
truthvalue_conversion (TREE_OPERAND (expr, 1)),
|
||
truthvalue_conversion (TREE_OPERAND (expr, 2))));
|
||
|
||
case CONVERT_EXPR:
|
||
/* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
|
||
since that affects how `default_conversion' will behave. */
|
||
if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
|
||
|| TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
|
||
break;
|
||
/* fall through... */
|
||
case NOP_EXPR:
|
||
/* If this is widening the argument, we can ignore it. */
|
||
if (TYPE_PRECISION (TREE_TYPE (expr))
|
||
>= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
|
||
return truthvalue_conversion (TREE_OPERAND (expr, 0));
|
||
break;
|
||
|
||
case MINUS_EXPR:
|
||
/* With IEEE arithmetic, x - x may not equal 0, so we can't optimize
|
||
this case. */
|
||
if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
|
||
&& TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE)
|
||
break;
|
||
/* fall through... */
|
||
case BIT_XOR_EXPR:
|
||
/* This and MINUS_EXPR can be changed into a comparison of the
|
||
two objects. */
|
||
if (TREE_TYPE (TREE_OPERAND (expr, 0))
|
||
== TREE_TYPE (TREE_OPERAND (expr, 1)))
|
||
return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
|
||
TREE_OPERAND (expr, 1), 1);
|
||
return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
|
||
fold (build1 (NOP_EXPR,
|
||
TREE_TYPE (TREE_OPERAND (expr, 0)),
|
||
TREE_OPERAND (expr, 1))), 1);
|
||
|
||
case BIT_AND_EXPR:
|
||
if (integer_onep (TREE_OPERAND (expr, 1))
|
||
&& TREE_TYPE (expr) != boolean_type_node)
|
||
/* Using convert here would cause infinite recursion. */
|
||
return build1 (NOP_EXPR, boolean_type_node, expr);
|
||
break;
|
||
|
||
case MODIFY_EXPR:
|
||
if (warn_parentheses && C_EXP_ORIGINAL_CODE (expr) == MODIFY_EXPR)
|
||
warning ("suggest parentheses around assignment used as truth value");
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
|
||
{
|
||
tree tem = save_expr (expr);
|
||
return (build_binary_op
|
||
((TREE_SIDE_EFFECTS (expr)
|
||
? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
|
||
truthvalue_conversion (build_unary_op (REALPART_EXPR, tem, 0)),
|
||
truthvalue_conversion (build_unary_op (IMAGPART_EXPR, tem, 0)),
|
||
0));
|
||
}
|
||
|
||
return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
|
||
}
|
||
|
||
#if USE_CPPLIB
|
||
/* Read the rest of a #-directive from input stream FINPUT.
|
||
In normal use, the directive name and the white space after it
|
||
have already been read, so they won't be included in the result.
|
||
We allow for the fact that the directive line may contain
|
||
a newline embedded within a character or string literal which forms
|
||
a part of the directive.
|
||
|
||
The value is a string in a reusable buffer. It remains valid
|
||
only until the next time this function is called. */
|
||
unsigned char *yy_cur, *yy_lim;
|
||
|
||
#define GETC() (yy_cur < yy_lim ? *yy_cur++ : yy_get_token ())
|
||
#define UNGETC(c) ((c), yy_cur--)
|
||
|
||
int
|
||
yy_get_token ()
|
||
{
|
||
for (;;)
|
||
{
|
||
parse_in.limit = parse_in.token_buffer;
|
||
cpp_token = cpp_get_token (&parse_in);
|
||
if (cpp_token == CPP_EOF)
|
||
return -1;
|
||
yy_lim = CPP_PWRITTEN (&parse_in);
|
||
yy_cur = parse_in.token_buffer;
|
||
if (yy_cur < yy_lim)
|
||
return *yy_cur++;
|
||
}
|
||
}
|
||
|
||
char *
|
||
get_directive_line ()
|
||
{
|
||
static char *directive_buffer = NULL;
|
||
static unsigned buffer_length = 0;
|
||
register char *p;
|
||
register char *buffer_limit;
|
||
register int looking_for = 0;
|
||
register int char_escaped = 0;
|
||
|
||
if (buffer_length == 0)
|
||
{
|
||
directive_buffer = (char *)xmalloc (128);
|
||
buffer_length = 128;
|
||
}
|
||
|
||
buffer_limit = &directive_buffer[buffer_length];
|
||
|
||
for (p = directive_buffer; ; )
|
||
{
|
||
int c;
|
||
|
||
/* Make buffer bigger if it is full. */
|
||
if (p >= buffer_limit)
|
||
{
|
||
register unsigned bytes_used = (p - directive_buffer);
|
||
|
||
buffer_length *= 2;
|
||
directive_buffer
|
||
= (char *)xrealloc (directive_buffer, buffer_length);
|
||
p = &directive_buffer[bytes_used];
|
||
buffer_limit = &directive_buffer[buffer_length];
|
||
}
|
||
|
||
c = GETC ();
|
||
|
||
/* Discard initial whitespace. */
|
||
if ((c == ' ' || c == '\t') && p == directive_buffer)
|
||
continue;
|
||
|
||
/* Detect the end of the directive. */
|
||
if (c == '\n' && looking_for == 0)
|
||
{
|
||
UNGETC (c);
|
||
c = '\0';
|
||
}
|
||
|
||
*p++ = c;
|
||
|
||
if (c == 0)
|
||
return directive_buffer;
|
||
|
||
/* Handle string and character constant syntax. */
|
||
if (looking_for)
|
||
{
|
||
if (looking_for == c && !char_escaped)
|
||
looking_for = 0; /* Found terminator... stop looking. */
|
||
}
|
||
else
|
||
if (c == '\'' || c == '"')
|
||
looking_for = c; /* Don't stop buffering until we see another
|
||
another one of these (or an EOF). */
|
||
|
||
/* Handle backslash. */
|
||
char_escaped = (c == '\\' && ! char_escaped);
|
||
}
|
||
}
|
||
#else
|
||
/* Read the rest of a #-directive from input stream FINPUT.
|
||
In normal use, the directive name and the white space after it
|
||
have already been read, so they won't be included in the result.
|
||
We allow for the fact that the directive line may contain
|
||
a newline embedded within a character or string literal which forms
|
||
a part of the directive.
|
||
|
||
The value is a string in a reusable buffer. It remains valid
|
||
only until the next time this function is called.
|
||
|
||
The terminating character ('\n' or EOF) is left in FINPUT for the
|
||
caller to re-read. */
|
||
|
||
char *
|
||
get_directive_line (finput)
|
||
register FILE *finput;
|
||
{
|
||
static char *directive_buffer = NULL;
|
||
static unsigned buffer_length = 0;
|
||
register char *p;
|
||
register char *buffer_limit;
|
||
register int looking_for = 0;
|
||
register int char_escaped = 0;
|
||
|
||
if (buffer_length == 0)
|
||
{
|
||
directive_buffer = (char *)xmalloc (128);
|
||
buffer_length = 128;
|
||
}
|
||
|
||
buffer_limit = &directive_buffer[buffer_length];
|
||
|
||
for (p = directive_buffer; ; )
|
||
{
|
||
int c;
|
||
|
||
/* Make buffer bigger if it is full. */
|
||
if (p >= buffer_limit)
|
||
{
|
||
register unsigned bytes_used = (p - directive_buffer);
|
||
|
||
buffer_length *= 2;
|
||
directive_buffer
|
||
= (char *)xrealloc (directive_buffer, buffer_length);
|
||
p = &directive_buffer[bytes_used];
|
||
buffer_limit = &directive_buffer[buffer_length];
|
||
}
|
||
|
||
c = getc (finput);
|
||
|
||
/* Discard initial whitespace. */
|
||
if ((c == ' ' || c == '\t') && p == directive_buffer)
|
||
continue;
|
||
|
||
/* Detect the end of the directive. */
|
||
if (looking_for == 0
|
||
&& (c == '\n' || c == EOF))
|
||
{
|
||
ungetc (c, finput);
|
||
c = '\0';
|
||
}
|
||
|
||
*p++ = c;
|
||
|
||
if (c == 0)
|
||
return directive_buffer;
|
||
|
||
/* Handle string and character constant syntax. */
|
||
if (looking_for)
|
||
{
|
||
if (looking_for == c && !char_escaped)
|
||
looking_for = 0; /* Found terminator... stop looking. */
|
||
}
|
||
else
|
||
if (c == '\'' || c == '"')
|
||
looking_for = c; /* Don't stop buffering until we see another
|
||
one of these (or an EOF). */
|
||
|
||
/* Handle backslash. */
|
||
char_escaped = (c == '\\' && ! char_escaped);
|
||
}
|
||
}
|
||
#endif /* !USE_CPPLIB */
|
||
|
||
/* Make a variant type in the proper way for C/C++, propagating qualifiers
|
||
down to the element type of an array. */
|
||
|
||
tree
|
||
c_build_qualified_type (type, type_quals)
|
||
tree type;
|
||
int type_quals;
|
||
{
|
||
/* A restrict-qualified pointer type must be a pointer to object or
|
||
incomplete type. Note that the use of POINTER_TYPE_P also allows
|
||
REFERENCE_TYPEs, which is appropriate for C++. Unfortunately,
|
||
the C++ front-end also use POINTER_TYPE for pointer-to-member
|
||
values, so even though it should be illegal to use `restrict'
|
||
with such an entity we don't flag that here. Thus, special case
|
||
code for that case is required in the C++ front-end. */
|
||
if ((type_quals & TYPE_QUAL_RESTRICT)
|
||
&& (!POINTER_TYPE_P (type)
|
||
|| !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
|
||
{
|
||
error ("invalid use of `restrict'");
|
||
type_quals &= ~TYPE_QUAL_RESTRICT;
|
||
}
|
||
|
||
if (TREE_CODE (type) == ARRAY_TYPE)
|
||
return build_array_type (c_build_qualified_type (TREE_TYPE (type),
|
||
type_quals),
|
||
TYPE_DOMAIN (type));
|
||
return build_qualified_type (type, type_quals);
|
||
}
|
||
|
||
/* Apply the TYPE_QUALS to the new DECL. */
|
||
|
||
void
|
||
c_apply_type_quals_to_decl (type_quals, decl)
|
||
int type_quals;
|
||
tree decl;
|
||
{
|
||
if (type_quals & TYPE_QUAL_CONST)
|
||
TREE_READONLY (decl) = 1;
|
||
if (type_quals & TYPE_QUAL_VOLATILE)
|
||
{
|
||
TREE_SIDE_EFFECTS (decl) = 1;
|
||
TREE_THIS_VOLATILE (decl) = 1;
|
||
}
|
||
if (type_quals & TYPE_QUAL_RESTRICT)
|
||
{
|
||
if (!TREE_TYPE (decl)
|
||
|| !POINTER_TYPE_P (TREE_TYPE (decl))
|
||
|| !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (TREE_TYPE (decl))))
|
||
error ("invalid use of `restrict'");
|
||
else if (flag_strict_aliasing)
|
||
{
|
||
/* No two restricted pointers can point at the same thing.
|
||
However, a restricted pointer can point at the same thing
|
||
as an unrestricted pointer, if that unrestricted pointer
|
||
is based on the restricted pointer. So, we make the
|
||
alias set for the restricted pointer a subset of the
|
||
alias set for the type pointed to by the type of the
|
||
decl. */
|
||
|
||
int pointed_to_alias_set
|
||
= get_alias_set (TREE_TYPE (TREE_TYPE (decl)));
|
||
|
||
if (!pointed_to_alias_set)
|
||
/* It's not legal to make a subset of alias set zero. */
|
||
;
|
||
else
|
||
{
|
||
DECL_POINTER_ALIAS_SET (decl) = new_alias_set ();
|
||
record_alias_subset (pointed_to_alias_set,
|
||
DECL_POINTER_ALIAS_SET (decl));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* T is an expression with pointer type. Find the DECL on which this
|
||
expression is based. (For example, in `a[i]' this would be `a'.)
|
||
If there is no such DECL, or a unique decl cannot be determined,
|
||
NULL_TREE is retured. */
|
||
|
||
static tree
|
||
c_find_base_decl (t)
|
||
tree t;
|
||
{
|
||
int i;
|
||
tree decl;
|
||
|
||
if (t == NULL_TREE || t == error_mark_node)
|
||
return NULL_TREE;
|
||
|
||
if (!POINTER_TYPE_P (TREE_TYPE (t)))
|
||
return NULL_TREE;
|
||
|
||
decl = NULL_TREE;
|
||
|
||
if (TREE_CODE (t) == FIELD_DECL
|
||
|| TREE_CODE (t) == PARM_DECL
|
||
|| TREE_CODE (t) == VAR_DECL)
|
||
/* Aha, we found a pointer-typed declaration. */
|
||
return t;
|
||
|
||
/* It would be nice to deal with COMPONENT_REFs here. If we could
|
||
tell that `a' and `b' were the same, then `a->f' and `b->f' are
|
||
also the same. */
|
||
|
||
/* Handle general expressions. */
|
||
switch (TREE_CODE_CLASS (TREE_CODE (t)))
|
||
{
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
for (i = tree_code_length [(int) TREE_CODE (t)]; --i >= 0;)
|
||
{
|
||
tree d = c_find_base_decl (TREE_OPERAND (t, i));
|
||
if (d)
|
||
{
|
||
if (!decl)
|
||
decl = d;
|
||
else if (d && d != decl)
|
||
/* Two different declarations. That's confusing; let's
|
||
just assume we don't know what's going on. */
|
||
decl = NULL_TREE;
|
||
}
|
||
}
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return decl;
|
||
}
|
||
|
||
/* Return the typed-based alias set for T, which may be an expression
|
||
or a type. */
|
||
|
||
int
|
||
c_get_alias_set (t)
|
||
tree t;
|
||
{
|
||
tree type;
|
||
tree u;
|
||
|
||
if (t == error_mark_node)
|
||
return 0;
|
||
|
||
type = (TREE_CODE_CLASS (TREE_CODE (t)) == 't')
|
||
? t : TREE_TYPE (t);
|
||
|
||
if (type == error_mark_node)
|
||
return 0;
|
||
|
||
/* Deal with special cases first; for certain kinds of references
|
||
we're interested in more than just the type. */
|
||
|
||
if (TREE_CODE (t) == BIT_FIELD_REF)
|
||
/* Perhaps reads and writes to this piece of data alias fields
|
||
neighboring the bitfield. Perhaps that's impossible. For now,
|
||
let's just assume that bitfields can alias everything, which is
|
||
the conservative assumption. */
|
||
return 0;
|
||
|
||
/* Permit type-punning when accessing a union, provided the access
|
||
is directly through the union. For example, this code does not
|
||
permit taking the address of a union member and then storing
|
||
through it. Even the type-punning allowed here is a GCC
|
||
extension, albeit a common and useful one; the C standard says
|
||
that such accesses have implementation-defined behavior. */
|
||
for (u = t;
|
||
TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
|
||
u = TREE_OPERAND (u, 0))
|
||
if (TREE_CODE (u) == COMPONENT_REF
|
||
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
|
||
return 0;
|
||
|
||
if (TREE_CODE (t) == INDIRECT_REF)
|
||
{
|
||
/* Check for accesses through restrict-qualified pointers. */
|
||
tree decl = c_find_base_decl (TREE_OPERAND (t, 0));
|
||
|
||
if (decl && DECL_POINTER_ALIAS_SET_KNOWN_P (decl))
|
||
/* We use the alias set indicated in the declaration. */
|
||
return DECL_POINTER_ALIAS_SET (decl);
|
||
}
|
||
|
||
/* From here on, only the type matters. */
|
||
|
||
if (TREE_CODE (t) == COMPONENT_REF
|
||
&& DECL_BIT_FIELD_TYPE (TREE_OPERAND (t, 1)))
|
||
/* Since build_modify_expr calls get_unwidened for stores to
|
||
component references, the type of a bit field can be changed
|
||
from (say) `unsigned int : 16' to `unsigned short' or from
|
||
`enum E : 16' to `short'. We want the real type of the
|
||
bit-field in this case, not some the integral equivalent. */
|
||
type = DECL_BIT_FIELD_TYPE (TREE_OPERAND (t, 1));
|
||
|
||
if (TYPE_ALIAS_SET_KNOWN_P (type))
|
||
/* If we've already calculated the value, just return it. */
|
||
return TYPE_ALIAS_SET (type);
|
||
else if (TYPE_MAIN_VARIANT (type) != type)
|
||
/* The C standard specifically allows aliasing between
|
||
cv-qualified variants of types. */
|
||
TYPE_ALIAS_SET (type) = c_get_alias_set (TYPE_MAIN_VARIANT (type));
|
||
else if (TREE_CODE (type) == INTEGER_TYPE)
|
||
{
|
||
tree signed_variant;
|
||
|
||
/* The C standard specifically allows aliasing between signed and
|
||
unsigned variants of the same type. We treat the signed
|
||
variant as canonical. */
|
||
signed_variant = signed_type (type);
|
||
|
||
if (signed_variant != type)
|
||
TYPE_ALIAS_SET (type) = c_get_alias_set (signed_variant);
|
||
else if (signed_variant == signed_char_type_node)
|
||
/* The C standard guarantess that any object may be accessed
|
||
via an lvalue that has character type. We don't have to
|
||
check for unsigned_char_type_node or char_type_node because
|
||
we are specifically looking at the signed variant. */
|
||
TYPE_ALIAS_SET (type) = 0;
|
||
}
|
||
else if (TREE_CODE (type) == ARRAY_TYPE)
|
||
/* Anything that can alias one of the array elements can alias
|
||
the entire array as well. */
|
||
TYPE_ALIAS_SET (type) = c_get_alias_set (TREE_TYPE (type));
|
||
else if (TREE_CODE (type) == FUNCTION_TYPE)
|
||
/* There are no objects of FUNCTION_TYPE, so there's no point in
|
||
using up an alias set for them. (There are, of course,
|
||
pointers and references to functions, but that's
|
||
different.) */
|
||
TYPE_ALIAS_SET (type) = 0;
|
||
else if (TREE_CODE (type) == RECORD_TYPE
|
||
|| TREE_CODE (type) == UNION_TYPE)
|
||
/* If TYPE is a struct or union type then we're reading or
|
||
writing an entire struct. Thus, we don't know anything about
|
||
aliasing. (In theory, such an access can only alias objects
|
||
whose type is the same as one of the fields, recursively, but
|
||
we don't yet make any use of that information.) */
|
||
TYPE_ALIAS_SET (type) = 0;
|
||
|
||
if (!TYPE_ALIAS_SET_KNOWN_P (type))
|
||
/* TYPE is something we haven't seen before. Put it in a new
|
||
alias set. */
|
||
TYPE_ALIAS_SET (type) = new_alias_set ();
|
||
|
||
return TYPE_ALIAS_SET (type);
|
||
}
|