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riscv-gcc-1
Commit e8bbfc4e by Richard Kenner
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Initial revision 

From-SVN: r406
parent dfbe1b2f
Showing with 2554 additions and 0 deletions
gcc/c-lex.c 0 → 100644
/* Lexical analyser for C and Objective C.
Copyright (C) 1987, 1988, 1989, 1992 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include <errno.h>
#include <setjmp.h>
#include "config.h"
#include "rtl.h"
#include "tree.h"
#include "input.h"
#include "c-lex.h"
#include "c-tree.h"
#include "flags.h"
#include "c-parse.h"
#ifdef MULTIBYTE_CHARS
#include <stdlib.h>
#include <locale.h>
#endif
#ifndef errno
extern int errno;
#endif
/* The elements of `ridpointers' are identifier nodes
for the reserved type names and storage classes.
It is indexed by a RID_... value. */
tree ridpointers[(int) RID_MAX];
/* Cause the `yydebug' variable to be defined. */
#define YYDEBUG 1
/* the declaration found for the last IDENTIFIER token read in.
yylex must look this up to detect typedefs, which get token type TYPENAME,
so it is left around in case the identifier is not a typedef but is
used in a context which makes it a reference to a variable. */
tree lastiddecl;
/* Nonzero enables objc features. */
int doing_objc_thang;
extern tree lookup_interface ();
extern int yydebug;
/* File used for outputting assembler code. */
extern FILE *asm_out_file;
#ifndef WCHAR_TYPE_SIZE
#ifdef INT_TYPE_SIZE
#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
#else
#define WCHAR_TYPE_SIZE BITS_PER_WORD
#endif
#endif
/* Number of bytes in a wide character. */
#define WCHAR_BYTES (WCHAR_TYPE_SIZE / BITS_PER_UNIT)
static int maxtoken; /* Current nominal length of token buffer. */
char *token_buffer; /* Pointer to token buffer.
Actual allocated length is maxtoken + 2.
This is not static because objc-parse.y uses it. */
/* Nonzero if end-of-file has been seen on input. */
static int end_of_file;
/* Buffered-back input character; faster than using ungetc. */
static int nextchar = -1;
int check_newline ();
/* Nonzero tells yylex to ignore \ in string constants. */
static int ignore_escape_flag = 0;
/* C code produced by gperf version 2.5 (GNU C++ version) */
/* Command-line: gperf -p -j1 -i 1 -g -o -t -N is_reserved_word -k1,3,$ c-parse.gperf */
struct resword { char *name; short token; enum rid rid; };
#define TOTAL_KEYWORDS 53
#define MIN_WORD_LENGTH 2
#define MAX_WORD_LENGTH 13
#define MIN_HASH_VALUE 7
#define MAX_HASH_VALUE 102
/* maximum key range = 96, duplicates = 0 */
#ifdef __GNUC__
__inline
#endif
static unsigned int
hash (str, len)
register char *str;
register int unsigned len;
{
static unsigned char asso_values[] =
{
103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
103, 103, 103, 103, 103, 1, 103, 2, 1, 24,
1, 5, 19, 39, 16, 13, 103, 1, 25, 1,
34, 34, 24, 103, 13, 12, 1, 45, 24, 7,
103, 103, 2, 103, 103, 103, 103, 103,
};
register int hval = len;
switch (hval)
{
default:
case 3:
hval += asso_values[str[2]];
case 2:
case 1:
hval += asso_values[str[0]];
}
return hval + asso_values[str[len - 1]];
}
#ifdef __GNUC__
__inline
#endif
struct resword *
is_reserved_word (str, len)
register char *str;
register unsigned int len;
{
static struct resword wordlist[] =
{
{"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",},
{"asm", ASM, NORID},
{"",},
{"__asm", ASM, NORID},
{"",},
{"__asm__", ASM, NORID},
{"break", BREAK, NORID},
{"__typeof__", TYPEOF, NORID},
{"",},
{"__alignof__", ALIGNOF, NORID},
{"",},
{"__attribute__", ATTRIBUTE, NORID},
{"int", TYPESPEC, RID_INT},
{"__attribute", ATTRIBUTE, NORID},
{"__extension__", EXTENSION, NORID},
{"",},
{"__signed", TYPESPEC, RID_SIGNED},
{"",},
{"__signed__", TYPESPEC, RID_SIGNED},
{"__inline__", SCSPEC, RID_INLINE},
{"else", ELSE, NORID},
{"__inline", SCSPEC, RID_INLINE},
{"default", DEFAULT, NORID},
{"__typeof", TYPEOF, NORID},
{"while", WHILE, NORID},
{"__alignof", ALIGNOF, NORID},
{"struct", STRUCT, NORID},
{"__const", TYPE_QUAL, RID_CONST},
{"if", IF, NORID},
{"__const__", TYPE_QUAL, RID_CONST},
{"__label__", LABEL, NORID},
{"do", DO, NORID},
{"__volatile__", TYPE_QUAL, RID_VOLATILE},
{"sizeof", SIZEOF, NORID},
{"__volatile", TYPE_QUAL, RID_VOLATILE},
{"auto", SCSPEC, RID_AUTO},
{"void", TYPESPEC, RID_VOID},
{"char", TYPESPEC, RID_CHAR},
{"static", SCSPEC, RID_STATIC},
{"case", CASE, NORID},
{"extern", SCSPEC, RID_EXTERN},
{"switch", SWITCH, NORID},
{"for", FOR, NORID},
{"inline", SCSPEC, RID_INLINE},
{"typeof", TYPEOF, NORID},
{"typedef", SCSPEC, RID_TYPEDEF},
{"short", TYPESPEC, RID_SHORT},
{"",},
{"return", RETURN, NORID},
{"enum", ENUM, NORID},
{"",},
{"double", TYPESPEC, RID_DOUBLE},
{"signed", TYPESPEC, RID_SIGNED},
{"float", TYPESPEC, RID_FLOAT},
{"",}, {"",},
{"volatile", TYPE_QUAL, RID_VOLATILE},
{"",},
{"const", TYPE_QUAL, RID_CONST},
{"",},
{"unsigned", TYPESPEC, RID_UNSIGNED},
{"",}, {"",}, {"",}, {"",},
{"continue", CONTINUE, NORID},
{"",},
{"register", SCSPEC, RID_REGISTER},
{"",}, {"",}, {"",}, {"",},
{"goto", GOTO, NORID},
{"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",},
{"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",},
{"union", UNION, NORID},
{"",}, {"",}, {"",}, {"",},
{"long", TYPESPEC, RID_LONG},
};
if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
{
register int key = hash (str, len);
if (key <= MAX_HASH_VALUE && key >= 0)
{
register char *s = wordlist[key].name;
if (*s == *str && !strcmp (str + 1, s + 1))
return &wordlist[key];
}
}
return 0;
}
/* Return something to represent absolute declarators containing a *.
TARGET is the absolute declarator that the * contains.
TYPE_QUALS is a list of modifiers such as const or volatile
to apply to the pointer type, represented as identifiers.
We return an INDIRECT_REF whose "contents" are TARGET
and whose type is the modifier list. */
tree
make_pointer_declarator (type_quals, target)
tree type_quals, target;
{
return build1 (INDIRECT_REF, type_quals, target);
}
void
init_lex ()
{
/* Make identifier nodes long enough for the language-specific slots. */
set_identifier_size (sizeof (struct lang_identifier));
/* Start it at 0, because check_newline is called at the very beginning
and will increment it to 1. */
lineno = 0;
#ifdef MULTIBYTE_CHARS
/* Change to the native locale for multibyte conversions. */
setlocale (LC_CTYPE, "");
#endif
maxtoken = 40;
token_buffer = (char *) xmalloc (maxtoken + 2);
ridpointers[(int) RID_INT] = get_identifier ("int");
ridpointers[(int) RID_CHAR] = get_identifier ("char");
ridpointers[(int) RID_VOID] = get_identifier ("void");
ridpointers[(int) RID_FLOAT] = get_identifier ("float");
ridpointers[(int) RID_DOUBLE] = get_identifier ("double");
ridpointers[(int) RID_SHORT] = get_identifier ("short");
ridpointers[(int) RID_LONG] = get_identifier ("long");
ridpointers[(int) RID_UNSIGNED] = get_identifier ("unsigned");
ridpointers[(int) RID_SIGNED] = get_identifier ("signed");
ridpointers[(int) RID_INLINE] = get_identifier ("inline");
ridpointers[(int) RID_CONST] = get_identifier ("const");
ridpointers[(int) RID_VOLATILE] = get_identifier ("volatile");
ridpointers[(int) RID_AUTO] = get_identifier ("auto");
ridpointers[(int) RID_STATIC] = get_identifier ("static");
ridpointers[(int) RID_EXTERN] = get_identifier ("extern");
ridpointers[(int) RID_TYPEDEF] = get_identifier ("typedef");
ridpointers[(int) RID_REGISTER] = get_identifier ("register");
/* Some options inhibit certain reserved words.
Clear those words out of the hash table so they won't be recognized. */
#define UNSET_RESERVED_WORD(STRING) \
do { struct resword *s = is_reserved_word (STRING, sizeof (STRING) - 1); \
if (s) s->name = ""; } while (0)
if (flag_traditional)
{
UNSET_RESERVED_WORD ("const");
UNSET_RESERVED_WORD ("volatile");
UNSET_RESERVED_WORD ("typeof");
UNSET_RESERVED_WORD ("signed");
UNSET_RESERVED_WORD ("inline");
}
if (flag_no_asm)
{
UNSET_RESERVED_WORD ("asm");
UNSET_RESERVED_WORD ("typeof");
UNSET_RESERVED_WORD ("inline");
}
}
void
reinit_parse_for_function ()
{
}
/* Function used when yydebug is set, to print a token in more detail. */
void
yyprint (file, yychar, yylval)
FILE *file;
int yychar;
YYSTYPE yylval;
{
tree t;
switch (yychar)
{
case IDENTIFIER:
case TYPENAME:
t = yylval.ttype;
if (IDENTIFIER_POINTER (t))
fprintf (file, " `%s'", IDENTIFIER_POINTER (t));
break;
case CONSTANT:
t = yylval.ttype;
if (TREE_CODE (t) == INTEGER_CST)
fprintf (file, " 0x%8x%8x", TREE_INT_CST_HIGH (t),
TREE_INT_CST_LOW (t));
break;
}
}
/* If C is not whitespace, return C.
Otherwise skip whitespace and return first nonwhite char read. */
static int
skip_white_space (c)
register int c;
{
#if 0
register int inside;
#endif
for (;;)
{
switch (c)
{
/* Don't recognize comments in cc1: all comments are removed by cpp,
and cpp output can include / and * consecutively as operators. */
#if 0
case '/':
c = getc (finput);
if (c != '*')
{
ungetc (c, finput);
return '/';
}
c = getc (finput);
inside = 1;
while (inside)
{
if (c == '*')
{
while (c == '*')
c = getc (finput);
if (c == '/')
{
inside = 0;
c = getc (finput);
}
}
else if (c == '\n')
{
lineno++;
c = getc (finput);
}
else if (c == EOF)
{
error ("unterminated comment");
break;
}
else
c = getc (finput);
}
break;
#endif
case '\n':
c = check_newline ();
break;
case ' ':
case '\t':
case '\f':
#if 0 /* ANSI says no. */
case '\r':
#endif
case '\v':
case '\b':
c = getc (finput);
break;
case '\\':
c = getc (finput);
if (c == '\n')
lineno++;
else
error ("stray '\\' in program");
c = getc (finput);
break;
default:
return (c);
}
}
}
/* Skips all of the white space at the current location in the input file.
Must use and reset nextchar if it has the next character. */
void
position_after_white_space ()
{
register int c;
if (nextchar != -1)
c = nextchar, nextchar = -1;
else
c = getc (finput);
ungetc (skip_white_space (c), finput);
}
/* Make the token buffer longer, preserving the data in it.
P should point to just beyond the last valid character in the old buffer.
The value we return is a pointer to the new buffer
at a place corresponding to P. */
static char *
extend_token_buffer (p)
char *p;
{
int offset = p - token_buffer;
maxtoken = maxtoken * 2 + 10;
token_buffer = (char *) xrealloc (token_buffer, maxtoken + 2);
return token_buffer + offset;
}
/* At the beginning of a line, increment the line number
and process any #-directive on this line.
If the line is a #-directive, read the entire line and return a newline.
Otherwise, return the line's first non-whitespace character. */
int
check_newline ()
{
register int c;
register int token;
lineno++;
/* Read first nonwhite char on the line. */
c = getc (finput);
while (c == ' ' || c == '\t')
c = getc (finput);
if (c != '#')
{
/* If not #, return it so caller will use it. */
return c;
}
/* Read first nonwhite char after the `#'. */
c = getc (finput);
while (c == ' ' || c == '\t')
c = getc (finput);
/* If a letter follows, then if the word here is `line', skip
it and ignore it; otherwise, ignore the line, with an error
if the word isn't `pragma', `ident', `define', or `undef'. */
if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
{
if (c == 'p')
{
if (getc (finput) == 'r'
&& getc (finput) == 'a'
&& getc (finput) == 'g'
&& getc (finput) == 'm'
&& getc (finput) == 'a'
&& ((c = getc (finput)) == ' ' || c == '\t' || c == '\n'))
{
#ifdef HANDLE_PRAGMA
HANDLE_PRAGMA (finput);
#endif /* HANDLE_PRAGMA */
goto skipline;
}
}
else if (c == 'd')
{
if (getc (finput) == 'e'
&& getc (finput) == 'f'
&& getc (finput) == 'i'
&& getc (finput) == 'n'
&& getc (finput) == 'e'
&& ((c = getc (finput)) == ' ' || c == '\t' || c == '\n'))
{
#ifdef DWARF_DEBUGGING_INFO
if ((debug_info_level == DINFO_LEVEL_VERBOSE)
&& (write_symbols == DWARF_DEBUG))
dwarfout_define (lineno, get_directive_line (finput));
#endif /* DWARF_DEBUGGING_INFO */
goto skipline;
}
}
else if (c == 'u')
{
if (getc (finput) == 'n'
&& getc (finput) == 'd'
&& getc (finput) == 'e'
&& getc (finput) == 'f'
&& ((c = getc (finput)) == ' ' || c == '\t' || c == '\n'))
{
#ifdef DWARF_DEBUGGING_INFO
if ((debug_info_level == DINFO_LEVEL_VERBOSE)
&& (write_symbols == DWARF_DEBUG))
dwarfout_undef (lineno, get_directive_line (finput));
#endif /* DWARF_DEBUGGING_INFO */
goto skipline;
}
}
else if (c == 'l')
{
if (getc (finput) == 'i'
&& getc (finput) == 'n'
&& getc (finput) == 'e'
&& ((c = getc (finput)) == ' ' || c == '\t'))
goto linenum;
}
else if (c == 'i')
{
if (getc (finput) == 'd'
&& getc (finput) == 'e'
&& getc (finput) == 'n'
&& getc (finput) == 't'
&& ((c = getc (finput)) == ' ' || c == '\t'))
{
/* #ident. The pedantic warning is now in cccp.c. */
/* Here we have just seen `#ident '.
A string constant should follow. */
while (c == ' ' || c == '\t')
c = getc (finput);
/* If no argument, ignore the line. */
if (c == '\n')
return c;
ungetc (c, finput);
token = yylex ();
if (token != STRING
|| TREE_CODE (yylval.ttype) != STRING_CST)
{
error ("invalid #ident");
goto skipline;
}
if (!flag_no_ident)
{
#ifdef ASM_OUTPUT_IDENT
ASM_OUTPUT_IDENT (asm_out_file, TREE_STRING_POINTER (yylval.ttype));
#endif
}
/* Skip the rest of this line. */
goto skipline;
}
}
error ("undefined or invalid # directive");
goto skipline;
}
linenum:
/* Here we have either `#line' or `# <nonletter>'.
In either case, it should be a line number; a digit should follow. */
while (c == ' ' || c == '\t')
c = getc (finput);
/* If the # is the only nonwhite char on the line,
just ignore it. Check the new newline. */
if (c == '\n')
return c;
/* Something follows the #; read a token. */
ungetc (c, finput);
token = yylex ();
if (token == CONSTANT
&& TREE_CODE (yylval.ttype) == INTEGER_CST)
{
int old_lineno = lineno;
int used_up = 0;
/* subtract one, because it is the following line that
gets the specified number */
int l = TREE_INT_CST_LOW (yylval.ttype) - 1;
/* Is this the last nonwhite stuff on the line? */
c = getc (finput);
while (c == ' ' || c == '\t')
c = getc (finput);
if (c == '\n')
{
/* No more: store the line number and check following line. */
lineno = l;
return c;
}
ungetc (c, finput);
/* More follows: it must be a string constant (filename). */
/* Read the string constant, but don't treat \ as special. */
ignore_escape_flag = 1;
token = yylex ();
ignore_escape_flag = 0;
if (token != STRING || TREE_CODE (yylval.ttype) != STRING_CST)
{
error ("invalid #line");
goto skipline;
}
input_filename
= (char *) permalloc (TREE_STRING_LENGTH (yylval.ttype) + 1);
strcpy (input_filename, TREE_STRING_POINTER (yylval.ttype));
lineno = l;
/* Each change of file name
reinitializes whether we are now in a system header. */
in_system_header = 0;
if (main_input_filename == 0)
main_input_filename = input_filename;
/* Is this the last nonwhite stuff on the line? */
c = getc (finput);
while (c == ' ' || c == '\t')
c = getc (finput);
if (c == '\n')
return c;
ungetc (c, finput);
token = yylex ();
used_up = 0;
/* `1' after file name means entering new file.
`2' after file name means just left a file. */
if (token == CONSTANT
&& TREE_CODE (yylval.ttype) == INTEGER_CST)
{
if (TREE_INT_CST_LOW (yylval.ttype) == 1)
{
/* Pushing to a new file. */
struct file_stack *p
= (struct file_stack *) xmalloc (sizeof (struct file_stack));
input_file_stack->line = old_lineno;
p->next = input_file_stack;
p->name = input_filename;
input_file_stack = p;
input_file_stack_tick++;
#ifdef DWARF_DEBUGGING_INFO
if (debug_info_level == DINFO_LEVEL_VERBOSE
&& write_symbols == DWARF_DEBUG)
dwarfout_start_new_source_file (input_filename);
#endif /* DWARF_DEBUGGING_INFO */
used_up = 1;
}
else if (TREE_INT_CST_LOW (yylval.ttype) == 2)
{
/* Popping out of a file. */
if (input_file_stack->next)
{
struct file_stack *p = input_file_stack;
input_file_stack = p->next;
free (p);
input_file_stack_tick++;
#ifdef DWARF_DEBUGGING_INFO
if (debug_info_level == DINFO_LEVEL_VERBOSE
&& write_symbols == DWARF_DEBUG)
dwarfout_resume_previous_source_file (input_file_stack->line);
#endif /* DWARF_DEBUGGING_INFO */
}
else
error ("#-lines for entering and leaving files don't match");
used_up = 1;
}
}
/* If we have handled a `1' or a `2',
see if there is another number to read. */
if (used_up)
{
/* Is this the last nonwhite stuff on the line? */
c = getc (finput);
while (c == ' ' || c == '\t')
c = getc (finput);
if (c == '\n')
return c;
ungetc (c, finput);
token = yylex ();
used_up = 0;
}
/* `3' after file name means this is a system header file. */
if (token == CONSTANT
&& TREE_CODE (yylval.ttype) == INTEGER_CST
&& TREE_INT_CST_LOW (yylval.ttype) == 3)
in_system_header = 1;
}
else
error ("invalid #-line");
/* skip the rest of this line. */
skipline:
if (c == '\n')
return c;
while ((c = getc (finput)) != EOF && c != '\n');
return c;
}
#define isalnum(char) ((char >= 'a' && char <= 'z') || (char >= 'A' && char <= 'Z') || (char >= '0' && char <= '9'))
#define isdigit(char) (char >= '0' && char <= '9')
#define ENDFILE -1 /* token that represents end-of-file */
/* Read an escape sequence, returning its equivalent as a character,
or -1 if it is backslash-newline. */
static int
readescape ()
{
register int c = getc (finput);
register int code;
register unsigned count;
unsigned firstdig;
switch (c)
{
case 'x':
if (warn_traditional)
warning ("the meaning of `\\x' varies with -traditional");
if (flag_traditional)
return c;
code = 0;
count = 0;
while (1)
{
c = getc (finput);
if (!(c >= 'a' && c <= 'f')
&& !(c >= 'A' && c <= 'F')
&& !(c >= '0' && c <= '9'))
{
ungetc (c, finput);
break;
}
code *= 16;
if (c >= 'a' && c <= 'f')
code += c - 'a' + 10;
if (c >= 'A' && c <= 'F')
code += c - 'A' + 10;
if (c >= '0' && c <= '9')
code += c - '0';
if (count == 0)
firstdig = code;
count++;
}
if (count == 0)
error ("\\x used with no following hex digits");
else if ((count - 1) * 4 >= TYPE_PRECISION (integer_type_node)
|| (count > 1
&& ((1 << (TYPE_PRECISION (integer_type_node) - (count - 1) * 4))
<= firstdig)))
pedwarn ("hex escape out of range");
return code;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7':
code = 0;
count = 0;
while ((c <= '7') && (c >= '0') && (count++ < 3))
{
code = (code * 8) + (c - '0');
c = getc (finput);
}
ungetc (c, finput);
return code;
case '\\': case '\'': case '"':
return c;
case '\n':
lineno++;
return -1;
case 'n':
return TARGET_NEWLINE;
case 't':
return TARGET_TAB;
case 'r':
return TARGET_CR;
case 'f':
return TARGET_FF;
case 'b':
return TARGET_BS;
case 'a':
if (warn_traditional)
warning ("the meaning of `\\a' varies with -traditional");
if (flag_traditional)
return c;
return TARGET_BELL;
case 'v':
#if 0 /* Vertical tab is present in common usage compilers. */
if (flag_traditional)
return c;
#endif
return TARGET_VT;
case 'E':
pedwarn ("non-ANSI-standard escape sequence, `\\E'");
return 033;
case '?':
return c;
/* `\(', etc, are used at beginning of line to avoid confusing Emacs. */
case '(':
case '{':
case '[':
if (pedantic)
pedwarn ("non-ANSI escape sequence `\\%c'", c);
return c;
}
if (c >= 040 && c <= 0177)
pedwarn ("unknown escape sequence `\\%c'", c);
else
pedwarn ("unknown escape sequence: `\\' followed by char code 0x%x", c);
return c;
}
void
yyerror (string)
char *string;
{
char buf[200];
strcpy (buf, string);
/* We can't print string and character constants well
because the token_buffer contains the result of processing escapes. */
if (end_of_file)
strcat (buf, " at end of input");
else if (token_buffer[0] == 0)
strcat (buf, " at null character");
else if (token_buffer[0] == '"')
strcat (buf, " before string constant");
else if (token_buffer[0] == '\'')
strcat (buf, " before character constant");
else if (token_buffer[0] < 040 || (unsigned char) token_buffer[0] >= 0177)
sprintf (buf + strlen (buf), " before character 0%o",
(unsigned char) token_buffer[0]);
else
strcat (buf, " before `%s'");
error (buf, token_buffer);
}
#if 0
struct try_type
{
tree *node_var;
char unsigned_flag;
char long_flag;
char long_long_flag;
};
struct try_type type_sequence[] =
{
{ &integer_type_node, 0, 0, 0},
{ &unsigned_type_node, 1, 0, 0},
{ &long_integer_type_node, 0, 1, 0},
{ &long_unsigned_type_node, 1, 1, 0},
{ &long_long_integer_type_node, 0, 1, 1},
{ &long_long_unsigned_type_node, 1, 1, 1}
};
#endif /* 0 */
int
yylex ()
{
register int c;
register char *p;
register int value;
int wide_flag = 0;
if (nextchar >= 0)
c = nextchar, nextchar = -1;
else
c = getc (finput);
/* Effectively do c = skip_white_space (c)
but do it faster in the usual cases. */
while (1)
switch (c)
{
case '\r':
if (!flag_traditional) /* ANSI says no */
goto found_nonwhite;
case ' ':
case '\t':
case '\f':
case '\v':
case '\b':
c = getc (finput);
break;
case '\n':
case '/':
case '\\':
c = skip_white_space (c);
default:
goto found_nonwhite;
}
found_nonwhite:
token_buffer[0] = c;
token_buffer[1] = 0;
/* yylloc.first_line = lineno; */
switch (c)
{
case EOF:
end_of_file = 1;
token_buffer[0] = 0;
value = ENDFILE;
break;
case '$':
if (dollars_in_ident)
goto letter;
return '$';
case 'L':
/* Capital L may start a wide-string or wide-character constant. */
{
register int c = getc (finput);
if (c == '\'')
{
wide_flag = 1;
goto char_constant;
}
if (c == '"')
{
wide_flag = 1;
goto string_constant;
}
ungetc (c, finput);
}
goto letter;
case '@':
if (!doing_objc_thang)
{
value = c;
break;
}
p = token_buffer;
*p++ = '@';
c = getc (finput);
while (isalnum (c) || c == '_')
{
if (p >= token_buffer + maxtoken)
p = extend_token_buffer (p);
*p++ = c;
c = getc (finput);
}
*p = 0;
nextchar = c;
value = recognize_objc_keyword (token_buffer + 1);
if (value != 0)
break;
error ("invalid Objective C keyword `%s'", token_buffer);
/* Cause a syntax error--1 is not a valid token type. */
value = 1;
break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y':
case 'Z':
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y':
case 'z':
case '_':
letter:
p = token_buffer;
while (isalnum (c) || c == '_' || c == '$' || c == '@')
{
if (p >= token_buffer + maxtoken)
p = extend_token_buffer (p);
if (c == '$' && ! dollars_in_ident)
break;
*p++ = c;
c = getc (finput);
}
*p = 0;
nextchar = c;
value = IDENTIFIER;
yylval.itype = 0;
/* Try to recognize a keyword. Uses minimum-perfect hash function */
{
register struct resword *ptr;
if (ptr = is_reserved_word (token_buffer, p - token_buffer))
{
if (ptr->rid)
yylval.ttype = ridpointers[(int) ptr->rid];
value = (int) ptr->token;
/* Even if we decided to recognize asm, still perhaps warn. */
if (pedantic
&& (value == ASM || value == TYPEOF
|| ptr->rid == RID_INLINE)
&& token_buffer[0] != '_')
pedwarn ("ANSI does not permit the keyword `%s'",
token_buffer);
}
}
/* If we did not find a keyword, look for an identifier
(or a typename). */
if (value == IDENTIFIER)
{
yylval.ttype = get_identifier (token_buffer);
lastiddecl = lookup_name (yylval.ttype);
if (lastiddecl != 0 && TREE_CODE (lastiddecl) == TYPE_DECL)
value = TYPENAME;
else if (doing_objc_thang)
{
tree objc_interface_decl = lookup_interface (yylval.ttype);
if (objc_interface_decl)
{
value = CLASSNAME;
yylval.ttype = objc_interface_decl;
}
}
}
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case '.':
{
int base = 10;
int count = 0;
int largest_digit = 0;
int numdigits = 0;
/* for multi-precision arithmetic,
we store only 8 live bits in each short,
giving us 64 bits of reliable precision */
short shorts[8];
int overflow = 0;
enum anon1 { NOT_FLOAT, AFTER_POINT, TOO_MANY_POINTS} floatflag
= NOT_FLOAT;
for (count = 0; count < 8; count++)
shorts[count] = 0;
p = token_buffer;
*p++ = c;
if (c == '0')
{
*p++ = (c = getc (finput));
if ((c == 'x') || (c == 'X'))
{
base = 16;
*p++ = (c = getc (finput));
}
/* Leading 0 forces octal unless the 0 is the only digit. */
else if (c >= '0' && c <= '9')
{
base = 8;
numdigits++;
}
else
numdigits++;
}
/* Read all the digits-and-decimal-points. */
while (c == '.'
|| (isalnum (c) && (c != 'l') && (c != 'L')
&& (c != 'u') && (c != 'U')
&& (floatflag == NOT_FLOAT || ((c != 'f') && (c != 'F')))))
{
if (c == '.')
{
if (base == 16)
error ("floating constant may not be in radix 16");
if (floatflag == AFTER_POINT)
{
error ("malformed floating constant");
floatflag = TOO_MANY_POINTS;
}
else
floatflag = AFTER_POINT;
base = 10;
*p++ = c = getc (finput);
/* Accept '.' as the start of a floating-point number
only when it is followed by a digit.
Otherwise, unread the following non-digit
and use the '.' as a structural token. */
if (p == token_buffer + 2 && !isdigit (c))
{
if (c == '.')
{
c = getc (finput);
if (c == '.')
{
*p++ = c;
*p = 0;
return ELLIPSIS;
}
error ("parse error at `..'");
}
ungetc (c, finput);
token_buffer[1] = 0;
value = '.';
goto done;
}
}
else
{
/* It is not a decimal point.
It should be a digit (perhaps a hex digit). */
if (isdigit (c))
{
c = c - '0';
}
else if (base <= 10)
{
if ((c&~040) == 'E')
{
base = 10;
floatflag = AFTER_POINT;
break; /* start of exponent */
}
error ("nondigits in number and not hexadecimal");
c = 0;
}
else if (c >= 'a')
{
c = c - 'a' + 10;
}
else
{
c = c - 'A' + 10;
}
if (c >= largest_digit)
largest_digit = c;
numdigits++;
for (count = 0; count < 8; count++)
{
shorts[count] *= base;
if (count)
{
shorts[count] += (shorts[count-1] >> 8);
shorts[count-1] &= (1<<8)-1;
}
else shorts[0] += c;
}
if (shorts[7] >= 1<<8
|| shorts[7] < - (1 << 8))
overflow = TRUE;
if (p >= token_buffer + maxtoken - 3)
p = extend_token_buffer (p);
*p++ = (c = getc (finput));
}
}
if (numdigits == 0)
error ("numeric constant with no digits");
if (largest_digit >= base)
error ("numeric constant contains digits beyond the radix");
/* Remove terminating char from the token buffer and delimit the string */
*--p = 0;
if (floatflag != NOT_FLOAT)
{
tree type = double_type_node;
char f_seen = 0;
char l_seen = 0;
REAL_VALUE_TYPE value;
jmp_buf handler;
/* Read explicit exponent if any, and put it in tokenbuf. */
if ((c == 'e') || (c == 'E'))
{
if (p >= token_buffer + maxtoken - 3)
p = extend_token_buffer (p);
*p++ = c;
c = getc (finput);
if ((c == '+') || (c == '-'))
{
*p++ = c;
c = getc (finput);
}
if (! isdigit (c))
error ("floating constant exponent has no digits");
while (isdigit (c))
{
if (p >= token_buffer + maxtoken - 3)
p = extend_token_buffer (p);
*p++ = c;
c = getc (finput);
}
}
*p = 0;
errno = 0;
/* Convert string to a double, checking for overflow. */
if (setjmp (handler))
{
error ("floating constant out of range");
value = dconst0;
}
else
{
set_float_handler (handler);
value = REAL_VALUE_ATOF (token_buffer);
set_float_handler (0);
}
#ifdef ERANGE
if (errno == ERANGE && !flag_traditional)
{
char *p1 = token_buffer;
/* Check for "0.0" and variants;
Sunos 4 spuriously returns ERANGE for them. */
while (*p1 == '0') p1++;
if (*p1 == '.')
{
p1++;
while (*p1 == '0') p1++;
}
if (*p1 == 'e' || *p1 == 'E')
{
/* with significand==0, ignore the exponent */
p1++;
while (*p1 != 0) p1++;
}
/* ERANGE is also reported for underflow,
so test the value to distinguish overflow from that. */
if (*p1 != 0 && (value > 1.0 || value < -1.0))
warning ("floating point number exceeds range of `double'");
}
#endif
/* Read the suffixes to choose a data type. */
while (1)
{
if (c == 'f' || c == 'F')
{
if (f_seen)
error ("two `f's in floating constant");
f_seen = 1;
type = float_type_node;
value = REAL_VALUE_TRUNCATE (TYPE_MODE (type), value);
}
else if (c == 'l' || c == 'L')
{
if (l_seen)
error ("two `l's in floating constant");
l_seen = 1;
type = long_double_type_node;
}
else
{
if (isalnum (c))
{
error ("garbage at end of number");
while (isalnum (c))
{
if (p >= token_buffer + maxtoken - 3)
p = extend_token_buffer (p);
*p++ = c;
c = getc (finput);
}
}
break;
}
if (p >= token_buffer + maxtoken - 3)
p = extend_token_buffer (p);
*p++ = c;
c = getc (finput);
}
/* Create a node with determined type and value. */
yylval.ttype = build_real (type, value);
ungetc (c, finput);
*p = 0;
}
else
{
tree traditional_type, ansi_type, type;
int spec_unsigned = 0;
int spec_long = 0;
int spec_long_long = 0;
int bytes, warn, i;
while (1)
{
if (c == 'u' || c == 'U')
{
if (spec_unsigned)
error ("two `u's in integer constant");
spec_unsigned = 1;
}
else if (c == 'l' || c == 'L')
{
if (spec_long)
{
if (spec_long_long)
error ("three `l's in integer constant");
else if (pedantic)
pedwarn ("ANSI C forbids long long integer constants");
spec_long_long = 1;
}
spec_long = 1;
}
else
{
if (isalnum (c))
{
error ("garbage at end of number");
while (isalnum (c))
{
if (p >= token_buffer + maxtoken - 3)
p = extend_token_buffer (p);
*p++ = c;
c = getc (finput);
}
}
break;
}
if (p >= token_buffer + maxtoken - 3)
p = extend_token_buffer (p);
*p++ = c;
c = getc (finput);
}
ungetc (c, finput);
/* If the constant is not long long and it won't fit in an
unsigned long, or if the constant is long long and won't fit
in an unsigned long long, then warn that the constant is out
of range. */
/* ??? This assumes that long long and long integer types are
a multiple of 8 bits. This better than the original code
though which assumed that long was exactly 32 bits and long
long was exactly 64 bits. */
if (spec_long_long)
bytes = TYPE_PRECISION (long_long_integer_type_node) / 8;
else
bytes = TYPE_PRECISION (long_integer_type_node) / 8;
if (bytes <= 8)
{
warn = overflow;
for (i = bytes; i < 8; i++)
if (shorts[i])
{
/* If LL was not used, then clear any excess precision.
This is equivalent to the original code, but it is
not clear why this is being done. Perhaps to prevent
ANSI programs from creating long long constants
by accident? */
if (! spec_long_long)
shorts[i] = 0;
warn = 1;
}
if (warn)
warning ("integer constant out of range");
}
else if (overflow)
warning ("integer constant larger than compiler can handle");
/* If it overflowed our internal buffer, then make it unsigned.
We can't distinguish based on the tree node because
any integer constant fits any long long type. */
if (overflow)
spec_unsigned = 1;
/* This is simplified by the fact that our constant
is always positive. */
/* The casts in the following statement should not be
needed, but they get around bugs in some C compilers. */
yylval.ttype
= (build_int_2
((((long)shorts[3]<<24) + ((long)shorts[2]<<16)
+ ((long)shorts[1]<<8) + (long)shorts[0]),
(((long)shorts[7]<<24) + ((long)shorts[6]<<16)
+ ((long)shorts[5]<<8) + (long)shorts[4])));
#if 0
/* Find the first allowable type that the value fits in. */
type = 0;
for (i = 0; i < sizeof (type_sequence) / sizeof (type_sequence[0]);
i++)
if (!(spec_long && !type_sequence[i].long_flag)
&& !(spec_long_long && !type_sequence[i].long_long_flag)
&& !(spec_unsigned && !type_sequence[i].unsigned_flag)
/* A decimal constant can't be unsigned int
unless explicitly specified. */
&& !(base == 10 && !spec_unsigned
&& *type_sequence[i].node_var == unsigned_type_node))
if (int_fits_type_p (yylval.ttype, *type_sequence[i].node_var))
{
type = *type_sequence[i].node_var;
break;
}
if (flag_traditional && type == long_unsigned_type_node
&& !spec_unsigned)
type = long_integer_type_node;
if (type == 0)
{
type = long_long_integer_type_node;
warning ("integer constant out of range");
}
/* Warn about some cases where the type of a given constant
changes from traditional C to ANSI C. */
if (warn_traditional)
{
tree other_type = 0;
/* This computation is the same as the previous one
except that flag_traditional is used backwards. */
for (i = 0; i < sizeof (type_sequence) / sizeof (type_sequence[0]);
i++)
if (!(spec_long && !type_sequence[i].long_flag)
&& !(spec_long_long && !type_sequence[i].long_long_flag)
&& !(spec_unsigned && !type_sequence[i].unsigned_flag)
/* A decimal constant can't be unsigned int
unless explicitly specified. */
&& !(base == 10 && !spec_unsigned
&& *type_sequence[i].node_var == unsigned_type_node))
if (int_fits_type_p (yylval.ttype, *type_sequence[i].node_var))
{
other_type = *type_sequence[i].node_var;
break;
}
if (!flag_traditional && type == long_unsigned_type_node
&& !spec_unsigned)
type = long_integer_type_node;
if (other_type != 0 && other_type != type)
{
if (flag_traditional)
warning ("type of integer constant would be different without -traditional");
else
warning ("type of integer constant would be different with -traditional");
}
}
#else /* 1 */
/* If warn_traditional, calculate both the ANSI type and the
traditional type, then see if they disagree.
Otherwise, calculate only the type for the dialect in use. */
if (warn_traditional || flag_traditional)
{
/* Calculate the traditional type. */
/* Traditionally, any constant is signed;
but if unsigned is specified explicitly, obey that.
Use the smallest size with the right number of bits,
except for one special case with decimal constants. */
if (! spec_long && base != 10
&& int_fits_type_p (yylval.ttype, unsigned_type_node))
traditional_type = (spec_unsigned ? unsigned_type_node
: integer_type_node);
/* A decimal constant must be long
if it does not fit in type int.
I think this is independent of whether
the constant is signed. */
else if (! spec_long && base == 10
&& int_fits_type_p (yylval.ttype, integer_type_node))
traditional_type = (spec_unsigned ? unsigned_type_node
: integer_type_node);
else if (! spec_long_long
&& int_fits_type_p (yylval.ttype,
long_unsigned_type_node))
traditional_type = (spec_unsigned ? long_unsigned_type_node
: long_integer_type_node);
else
traditional_type = (spec_unsigned
? long_long_unsigned_type_node
: long_long_integer_type_node);
}
if (warn_traditional || ! flag_traditional)
{
/* Calculate the ANSI type. */
if (! spec_long && ! spec_unsigned
&& int_fits_type_p (yylval.ttype, integer_type_node))
ansi_type = integer_type_node;
else if (! spec_long && (base != 10 || spec_unsigned)
&& int_fits_type_p (yylval.ttype, unsigned_type_node))
ansi_type = unsigned_type_node;
else if (! spec_unsigned && !spec_long_long
&& int_fits_type_p (yylval.ttype, long_integer_type_node))
ansi_type = long_integer_type_node;
else if (! spec_long_long
&& int_fits_type_p (yylval.ttype,
long_unsigned_type_node))
ansi_type = long_unsigned_type_node;
else if (! spec_unsigned
&& int_fits_type_p (yylval.ttype,
long_long_integer_type_node))
ansi_type = long_long_integer_type_node;
else
ansi_type = long_long_unsigned_type_node;
}
type = flag_traditional ? traditional_type : ansi_type;
if (warn_traditional && traditional_type != ansi_type)
{
if (TYPE_PRECISION (traditional_type)
!= TYPE_PRECISION (ansi_type))
warning ("width of integer constant changes with -traditional");
else if (TREE_UNSIGNED (traditional_type)
!= TREE_UNSIGNED (ansi_type))
warning ("integer constant is unsigned in ANSI C, signed with -traditional");
else abort ();
}
#endif
TREE_TYPE (yylval.ttype) = type;
*p = 0;
}
value = CONSTANT; break;
}
case '\'':
char_constant:
{
register int result = 0;
register num_chars = 0;
unsigned width = TYPE_PRECISION (char_type_node);
int max_chars;
if (wide_flag)
{
width = WCHAR_TYPE_SIZE;
#ifdef MULTIBYTE_CHARS
max_chars = MB_CUR_MAX;
#else
max_chars = 1;
#endif
}
else
max_chars = TYPE_PRECISION (integer_type_node) / width;
while (1)
{
tryagain:
c = getc (finput);
if (c == '\'' || c == EOF)
break;
if (c == '\\')
{
c = readescape ();
if (c < 0)
goto tryagain;
if (width < HOST_BITS_PER_INT
&& (unsigned) c >= (1 << width))
pedwarn ("escape sequence out of range for character");
}
else if (c == '\n')
{
if (pedantic)
pedwarn ("ANSI C forbids newline in character constant");
lineno++;
}
num_chars++;
if (num_chars > maxtoken - 4)
extend_token_buffer (token_buffer);
token_buffer[num_chars] = c;
/* Merge character into result; ignore excess chars. */
if (num_chars < max_chars + 1)
{
if (width < HOST_BITS_PER_INT)
result = (result << width) | (c & ((1 << width) - 1));
else
result = c;
}
}
token_buffer[num_chars + 1] = '\'';
token_buffer[num_chars + 2] = 0;
if (c != '\'')
error ("malformatted character constant");
else if (num_chars == 0)
error ("empty character constant");
else if (num_chars > max_chars)
{
num_chars = max_chars;
error ("character constant too long");
}
else if (num_chars != 1 && ! flag_traditional)
warning ("multi-character character constant");
/* If char type is signed, sign-extend the constant. */
if (! wide_flag)
{
int num_bits = num_chars * width;
if (TREE_UNSIGNED (char_type_node)
|| ((result >> (num_bits - 1)) & 1) == 0)
yylval.ttype
= build_int_2 (result & ((unsigned) ~0
>> (HOST_BITS_PER_INT - num_bits)),
0);
else
yylval.ttype
= build_int_2 (result | ~((unsigned) ~0
>> (HOST_BITS_PER_INT - num_bits)),
-1);
}
else
{
#ifdef MULTIBYTE_CHARS
/* Set the initial shift state and convert the next sequence. */
result = 0;
/* In all locales L'\0' is zero and mbtowc will return zero,
so don't use it. */
if (num_chars > 1
|| (num_chars == 1 && token_buffer[1] != '\0'))
{
wchar_t wc;
(void) mbtowc (NULL, NULL, 0);
if (mbtowc (& wc, token_buffer + 1, num_chars) == num_chars)
result = wc;
else
warning ("Ignoring invalid multibyte character");
}
#endif
yylval.ttype = build_int_2 (result, 0);
}
TREE_TYPE (yylval.ttype) = integer_type_node;
value = CONSTANT;
break;
}
case '"':
string_constant:
{
c = getc (finput);
p = token_buffer + 1;
while (c != '"' && c >= 0)
{
/* ignore_escape_flag is set for reading the filename in #line. */
if (!ignore_escape_flag && c == '\\')
{
c = readescape ();
if (c < 0)
goto skipnewline;
if (!wide_flag
&& TYPE_PRECISION (char_type_node) < HOST_BITS_PER_INT
&& c >= (1 << TYPE_PRECISION (char_type_node)))
pedwarn ("escape sequence out of range for character");
}
else if (c == '\n')
{
if (pedantic)
pedwarn ("ANSI C forbids newline in string constant");
lineno++;
}
if (p == token_buffer + maxtoken)
p = extend_token_buffer (p);
*p++ = c;
skipnewline:
c = getc (finput);
}
*p = 0;
/* We have read the entire constant.
Construct a STRING_CST for the result. */
if (wide_flag)
{
/* If this is a L"..." wide-string, convert the multibyte string
to a wide character string. */
char *widep = (char *) alloca ((p - token_buffer) * WCHAR_BYTES);
int len;
#ifdef MULTIBYTE_CHARS
len = mbstowcs ((wchar_t *) widep, token_buffer + 1, p - token_buffer);
if ((unsigned) len >= (p - token_buffer))
{
warning ("Ignoring invalid multibyte string");
len = 0;
}
bzero (widep + (len * WCHAR_BYTES), WCHAR_BYTES);
#else
{
union { long l; char c[sizeof (long)]; } u;
int big_endian;
char *wp, *cp;
/* Determine whether host is little or big endian. */
u.l = 1;
big_endian = u.c[sizeof (long) - 1];
wp = widep + (big_endian ? WCHAR_BYTES - 1 : 0);
bzero (widep, (p - token_buffer) * WCHAR_BYTES);
for (cp = token_buffer + 1; cp < p; cp++)
*wp = *cp, wp += WCHAR_BYTES;
len = p - token_buffer - 1;
}
#endif
yylval.ttype = build_string ((len + 1) * WCHAR_BYTES, widep);
TREE_TYPE (yylval.ttype) = wchar_array_type_node;
}
else
{
yylval.ttype = build_string (p - token_buffer, token_buffer + 1);
TREE_TYPE (yylval.ttype) = char_array_type_node;
}
*p++ = '"';
*p = 0;
value = STRING; break;
}
case '+':
case '-':
case '&':
case '|':
case '<':
case '>':
case '*':
case '/':
case '%':
case '^':
case '!':
case '=':
{
register int c1;
combine:
switch (c)
{
case '+':
yylval.code = PLUS_EXPR; break;
case '-':
yylval.code = MINUS_EXPR; break;
case '&':
yylval.code = BIT_AND_EXPR; break;
case '|':
yylval.code = BIT_IOR_EXPR; break;
case '*':
yylval.code = MULT_EXPR; break;
case '/':
yylval.code = TRUNC_DIV_EXPR; break;
case '%':
yylval.code = TRUNC_MOD_EXPR; break;
case '^':
yylval.code = BIT_XOR_EXPR; break;
case LSHIFT:
yylval.code = LSHIFT_EXPR; break;
case RSHIFT:
yylval.code = RSHIFT_EXPR; break;
case '<':
yylval.code = LT_EXPR; break;
case '>':
yylval.code = GT_EXPR; break;
}
token_buffer[1] = c1 = getc (finput);
token_buffer[2] = 0;
if (c1 == '=')
{
switch (c)
{
case '<':
value = ARITHCOMPARE; yylval.code = LE_EXPR; goto done;
case '>':
value = ARITHCOMPARE; yylval.code = GE_EXPR; goto done;
case '!':
value = EQCOMPARE; yylval.code = NE_EXPR; goto done;
case '=':
value = EQCOMPARE; yylval.code = EQ_EXPR; goto done;
}
value = ASSIGN; goto done;
}
else if (c == c1)
switch (c)
{
case '+':
value = PLUSPLUS; goto done;
case '-':
value = MINUSMINUS; goto done;
case '&':
value = ANDAND; goto done;
case '|':
value = OROR; goto done;
case '<':
c = LSHIFT;
goto combine;
case '>':
c = RSHIFT;
goto combine;
}
else if ((c == '-') && (c1 == '>'))
{ value = POINTSAT; goto done; }
ungetc (c1, finput);
token_buffer[1] = 0;
if ((c == '<') || (c == '>'))
value = ARITHCOMPARE;
else value = c;
goto done;
}
case 0:
/* Don't make yyparse think this is eof. */
value = 1;
break;
default:
value = c;
}
done:
/* yylloc.last_line = lineno; */
return value;
}
/* Sets the value of the 'yydebug' varable to VALUE.
This is a function so we don't have to have YYDEBUG defined
in order to build the compiler. */
void
set_yydebug (value)
int value;
{
#if YYDEBUG != 0
yydebug = value;
#else
warning ("YYDEBUG not defined.");
#endif
}
gcc/expr.h 0 → 100644
/* Definitions for code generation pass of GNU compiler.
Copyright (C) 1987, 1991 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifndef __STDC__
#ifndef const
#define const
#endif
#endif
/* The default branch cost is 1. */
#ifndef BRANCH_COST
#define BRANCH_COST 1
#endif
/* Macros to access the slots of a QUEUED rtx.
Here rather than in rtl.h because only the expansion pass
should ever encounter a QUEUED. */
/* The variable for which an increment is queued. */
#define QUEUED_VAR(P) XEXP (P, 0)
/* If the increment has been emitted, this is the insn
that does the increment. It is zero before the increment is emitted. */
#define QUEUED_INSN(P) XEXP (P, 1)
/* If a pre-increment copy has been generated, this is the copy
(it is a temporary reg). Zero if no copy made yet. */
#define QUEUED_COPY(P) XEXP (P, 2)
/* This is the body to use for the insn to do the increment.
It is used to emit the increment. */
#define QUEUED_BODY(P) XEXP (P, 3)
/* Next QUEUED in the queue. */
#define QUEUED_NEXT(P) XEXP (P, 4)
/* This is the 4th arg to `expand_expr'.
EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
is a constant that is not a legitimate address. */
enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER};
/* List of labels that must never be deleted. */
extern rtx forced_labels;
/* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
So we can mark them all live at the end of the function, if stupid. */
extern rtx save_expr_regs;
extern int current_function_calls_alloca;
extern int current_function_outgoing_args_size;
/* This is the offset from the arg pointer to the place where the first
anonymous arg can be found, if there is one. */
extern rtx current_function_arg_offset_rtx;
/* This is nonzero if the current function uses the constant pool. */
extern int current_function_uses_const_pool;
/* This is nonzero if the current function uses pic_offset_table_rtx. */
extern int current_function_uses_pic_offset_table;
/* The arg pointer hard register, or the pseudo into which it was copied. */
extern rtx current_function_internal_arg_pointer;
/* Nonzero means stack pops must not be deferred, and deferred stack
pops must not be output. It is nonzero inside a function call,
inside a conditional expression, inside a statement expression,
and in other cases as well. */
extern int inhibit_defer_pop;
/* Number of function calls seen so far in current function. */
extern int function_call_count;
/* RTX for stack slot that holds the current handler for nonlocal gotos.
Zero when function does not have nonlocal labels. */
extern rtx nonlocal_goto_handler_slot;
/* RTX for stack slot that holds the stack pointer value to restore
for a nonlocal goto.
Zero when function does not have nonlocal labels. */
extern rtx nonlocal_goto_stack_level;
/* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
(labels to which there can be nonlocal gotos from nested functions)
in this function. */
#ifdef TREE_CODE /* Don't lose if tree.h not included. */
extern tree nonlocal_labels;
#endif
#define NO_DEFER_POP (inhibit_defer_pop += 1)
#define OK_DEFER_POP (inhibit_defer_pop -= 1)
/* Number of units that we should eventually pop off the stack.
These are the arguments to function calls that have already returned. */
extern int pending_stack_adjust;
/* A list of all cleanups which belong to the arguments of
function calls being expanded by expand_call. */
#ifdef TREE_CODE /* Don't lose if tree.h not included. */
extern tree cleanups_this_call;
#endif
#ifdef TREE_CODE /* Don't lose if tree.h not included. */
/* Structure to record the size of a sequence of arguments
as the sum of a tree-expression and a constant. */
struct args_size
{
int constant;
tree var;
};
#endif
/* Add the value of the tree INC to the `struct args_size' TO. */
#define ADD_PARM_SIZE(TO, INC) \
{ tree inc = (INC); \
if (TREE_CODE (inc) == INTEGER_CST) \
(TO).constant += TREE_INT_CST_LOW (inc); \
else if ((TO).var == 0) \
(TO).var = inc; \
else \
(TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
#define SUB_PARM_SIZE(TO, DEC) \
{ tree dec = (DEC); \
if (TREE_CODE (dec) == INTEGER_CST) \
(TO).constant -= TREE_INT_CST_LOW (dec); \
else if ((TO).var == 0) \
(TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
else \
(TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
/* Convert the implicit sum in a `struct args_size' into an rtx. */
#define ARGS_SIZE_RTX(SIZE) \
((SIZE).var == 0 ? gen_rtx (CONST_INT, VOIDmode, (SIZE).constant) \
: expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
size_int ((SIZE).constant)), \
0, VOIDmode, 0))
/* Convert the implicit sum in a `struct args_size' into a tree. */
#define ARGS_SIZE_TREE(SIZE) \
((SIZE).var == 0 ? size_int ((SIZE).constant) \
: size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
/* Supply a default definition for FUNCTION_ARG_PADDING:
usually pad upward, but pad short, non-BLKmode args downward on
big-endian machines. */
enum direction {none, upward, downward}; /* Value has this type. */
#ifndef FUNCTION_ARG_PADDING
#if BYTES_BIG_ENDIAN
#define FUNCTION_ARG_PADDING(MODE, TYPE) \
(((MODE) == BLKmode \
? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
&& int_size_in_bytes (TYPE) < PARM_BOUNDARY / BITS_PER_UNIT) \
: GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
? downward : upward)
#else
#define FUNCTION_ARG_PADDING(MODE, TYPE) upward
#endif
#endif
/* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
FUNCTION_ARG_PADDING, which also pads the length, handle any needed
alignment. */
#ifndef FUNCTION_ARG_BOUNDARY
#define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
#endif
/* Nonzero if we do not know how to pass TYPE solely in registers.
We cannot do so in the following cases:
- if the type has variable size
- if the type is marked as addressable (it is required to be constructed
into the stack)
- if the padding and mode of the type is such that a copy into a register
would put it into the wrong part of the register
- when STRICT_ALIGNMENT and the type is BLKmode and is is not
aligned to a boundary corresponding to what can be loaded into a
register. */
#define MUST_PASS_IN_STACK_BAD_ALIGN(MODE,TYPE) \
(STRICT_ALIGNMENT && MODE == BLKmode \
&& TYPE_ALIGN (TYPE) < (BIGGEST_ALIGNMENT < BITS_PER_WORD \
? BIGGEST_ALIGNMENT : BITS_PER_WORD))
/* Which padding can't be supported depends on the byte endianness. */
/* A value in a register is implicitly padded at the most significant end.
On a big-endian machine, that is the lower end in memory.
So a value padded in memory at the upper end can't go in a register.
For a little-endian machine, the reverse is true. */
#if BYTES_BIG_ENDIAN
#define MUST_PASS_IN_STACK_BAD_PADDING upward
#else
#define MUST_PASS_IN_STACK_BAD_PADDING downward
#endif
#define MUST_PASS_IN_STACK(MODE,TYPE) \
((TYPE) != 0 \
&& (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
|| TREE_ADDRESSABLE (TYPE) \
|| ((MODE) == BLKmode \
&& (FUNCTION_ARG_PADDING (MODE, TYPE) \
== MUST_PASS_IN_STACK_BAD_PADDING)) \
|| MUST_PASS_IN_STACK_BAD_ALIGN (MODE, TYPE)))
/* Nonzero if type TYPE should be returned in memory
(even though its mode is not BLKmode).
Most machines can use the following default definition. */
#ifndef RETURN_IN_MEMORY
#define RETURN_IN_MEMORY(TYPE) 0
#endif
/* Optabs are tables saying how to generate insn bodies
for various machine modes and numbers of operands.
Each optab applies to one operation.
For example, add_optab applies to addition.
The insn_code slot is the enum insn_code that says how to
generate an insn for this operation on a particular machine mode.
It is CODE_FOR_nothing if there is no such insn on the target machine.
The `lib_call' slot is the name of the library function that
can be used to perform the operation.
A few optabs, such as move_optab and cmp_optab, are used
by special code. */
/* Everything that uses expr.h needs to define enum insn_code
but we don't list it in the Makefile dependencies just for that. */
#include "insn-codes.h"
typedef struct optab
{
enum rtx_code code;
struct {
enum insn_code insn_code;
rtx libfunc;
} handlers [NUM_MACHINE_MODES];
} * optab;
/* Given an enum insn_code, access the function to construct
the body of that kind of insn. */
#ifdef FUNCTION_CONVERSION_BUG
/* Some compilers fail to convert a function properly to a
pointer-to-function when used as an argument.
So produce the pointer-to-function directly.
Luckily, these compilers seem to work properly when you
call the pointer-to-function. */
#define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
#else
#define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
#endif
extern rtx (*const insn_gen_function[]) ();
extern optab add_optab;
extern optab sub_optab;
extern optab smul_optab; /* Signed multiply */
extern optab smul_widen_optab; /* Signed multiply with result
one machine mode wider than args */
extern optab umul_widen_optab;
extern optab sdiv_optab; /* Signed divide */
extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
extern optab udiv_optab;
extern optab udivmod_optab;
extern optab smod_optab; /* Signed remainder */
extern optab umod_optab;
extern optab flodiv_optab; /* Optab for floating divide. */
extern optab ftrunc_optab; /* Convert float to integer in float fmt */
extern optab and_optab; /* Logical and */
extern optab ior_optab; /* Logical or */
extern optab xor_optab; /* Logical xor */
extern optab ashl_optab; /* Arithmetic shift left */
extern optab ashr_optab; /* Arithmetic shift right */
extern optab lshl_optab; /* Logical shift left */
extern optab lshr_optab; /* Logical shift right */
extern optab rotl_optab; /* Rotate left */
extern optab rotr_optab; /* Rotate right */
extern optab smin_optab; /* Signed minimum value */
extern optab smax_optab; /* Signed maximum value */
extern optab umin_optab; /* Unsigned minimum value */
extern optab umax_optab; /* Unsigned maximum value */
extern optab mov_optab; /* Move instruction. */
extern optab movstrict_optab; /* Move, preserving high part of register. */
extern optab cmp_optab; /* Compare insn; two operands. */
extern optab tst_optab; /* tst insn; compare one operand against 0 */
/* Unary operations */
extern optab neg_optab; /* Negation */
extern optab abs_optab; /* Abs value */
extern optab one_cmpl_optab; /* Bitwise not */
extern optab ffs_optab; /* Find first bit set */
/* Passed to expand_binop and expand_unop to say which options to try to use
if the requested operation can't be open-coded on the requisite mode.
Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
OPTAB_MUST_WIDEN says try widening and don't try anything else. */
enum optab_methods
{
OPTAB_DIRECT,
OPTAB_LIB,
OPTAB_WIDEN,
OPTAB_LIB_WIDEN,
OPTAB_MUST_WIDEN
};
/* SYMBOL_REF rtx's for the library functions that are called
implicitly and not via optabs. */
extern rtx extendsfdf2_libfunc;
extern rtx truncdfsf2_libfunc;
extern rtx memcpy_libfunc;
extern rtx bcopy_libfunc;
extern rtx memcmp_libfunc;
extern rtx bcmp_libfunc;
extern rtx memset_libfunc;
extern rtx bzero_libfunc;
extern rtx eqsf2_libfunc;
extern rtx nesf2_libfunc;
extern rtx gtsf2_libfunc;
extern rtx gesf2_libfunc;
extern rtx ltsf2_libfunc;
extern rtx lesf2_libfunc;
extern rtx eqdf2_libfunc;
extern rtx nedf2_libfunc;
extern rtx gtdf2_libfunc;
extern rtx gedf2_libfunc;
extern rtx ltdf2_libfunc;
extern rtx ledf2_libfunc;
extern rtx floatdisf_libfunc;
extern rtx floatsisf_libfunc;
extern rtx floatdidf_libfunc;
extern rtx floatsidf_libfunc;
extern rtx fixsfsi_libfunc;
extern rtx fixsfdi_libfunc;
extern rtx fixdfsi_libfunc;
extern rtx fixdfdi_libfunc;
extern rtx fixunssfsi_libfunc;
extern rtx fixunssfdi_libfunc;
extern rtx fixunsdfsi_libfunc;
extern rtx fixunsdfdi_libfunc;
typedef rtx (*rtxfun) ();
/* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
gives the gen_function to make a branch to test that condition. */
extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
/* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
gives the insn code to make a store-condition insn
to test that condition. */
extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
/* Expand a binary operation given optab and rtx operands. */
extern rtx expand_binop ();
/* Expand a binary operation with both signed and unsigned forms. */
extern rtx sign_expand_binop ();
/* Expand a unary arithmetic operation given optab rtx operand. */
extern rtx expand_unop ();
/* Arguments MODE, RTX: return an rtx for the negation of that value.
May emit insns. */
extern rtx negate_rtx ();
/* Expand a logical AND operation. */
extern rtx expand_and ();
/* Emit a store-flag operation. */
extern rtx emit_store_flag ();
/* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
extern rtx label_rtx ();
/* Given a JUMP_INSN, return a description of the test being made. */
extern rtx get_condition ();
/* Return the INSN_CODE to use for an extend operation. */
extern enum insn_code can_extend_p ();
/* Initialize the tables that control conversion between fixed and
floating values. */
extern void init_fixtab ();
extern void init_floattab ();
/* Generate code for a FIX_EXPR. */
extern void expand_fix ();
/* Generate code for a FLOAT_EXPR. */
extern void expand_float ();
/* Create but don't emit one rtl instruction to add one rtx into another.
Modes must match; operands must meet the operation's predicates.
Likewise for subtraction and for just copying.
These do not call protect_from_queue; caller must do so. */
extern rtx gen_add2_insn ();
extern rtx gen_sub2_insn ();
extern rtx gen_move_insn ();
/* Emit one rtl instruction to store zero in specified rtx. */
extern void emit_clr_insn ();
/* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
extern void emit_0_to_1_insn ();
/* Emit one rtl insn to compare two rtx's. */
extern void emit_cmp_insn ();
/* Generate rtl to compate two rtx's, will call emit_cmp_insn. */
extern rtx compare_from_rtx ();
/* Emit some rtl insns to move data between rtx's, converting machine modes.
Both modes must be floating or both fixed. */
extern void convert_move ();
/* Convert an rtx to specified machine mode and return the result. */
extern rtx convert_to_mode ();
/* Emit code to push some arguments and call a library routine,
storing the value in a specified place. Calling sequence is
complicated. */
extern void emit_library_call ();
/* Given an rtx that may include add and multiply operations,
generate them as insns and return a pseudo-reg containing the value.
Useful after calling expand_expr with 1 as sum_ok. */
extern rtx force_operand ();
/* Return an rtx for the size in bytes of the value of an expr. */
extern rtx expr_size ();
/* Return an rtx for the sum of an rtx and an integer. */
extern rtx plus_constant ();
extern rtx lookup_static_chain ();
/* Return an rtx like arg but sans any constant terms.
Returns the original rtx if it has no constant terms.
The constant terms are added and stored via a second arg. */
extern rtx eliminate_constant_term ();
/* Convert arg to a valid memory address for specified machine mode,
by emitting insns to perform arithmetic if nec. */
extern rtx memory_address ();
/* Like `memory_address' but pretent `flag_force_addr' is 0. */
extern rtx memory_address_noforce ();
/* Return a memory reference like MEMREF, but with its mode changed
to MODE and its address changed to ADDR.
(VOIDmode means don't change the mode.
NULL for ADDR means don't change the address.) */
extern rtx change_address ();
/* Return a memory reference like MEMREF, but which is known to have a
valid address. */
extern rtx validize_mem ();
/* Convert a stack slot address ADDR valid in function FNDECL
into an address valid in this function (using a static chain). */
extern rtx fix_lexical_addr ();
/* Return the address of the trampoline for entering nested fn FUNCTION. */
extern rtx trampoline_address ();
/* Assemble the static constant template for function entry trampolines. */
extern rtx assemble_trampoline_template ();
/* Return 1 if two rtx's are equivalent in structure and elements. */
extern int rtx_equal_p ();
/* Given rtx, return new rtx whose address won't be affected by
any side effects. It has been copied to a new temporary reg. */
extern rtx stabilize ();
/* Given an rtx, copy all regs it refers to into new temps
and return a modified copy that refers to the new temps. */
extern rtx copy_all_regs ();
/* Copy given rtx to a new temp reg and return that. */
extern rtx copy_to_reg ();
/* Like copy_to_reg but always make the reg Pmode. */
extern rtx copy_addr_to_reg ();
/* Like copy_to_reg but always make the reg the specified mode MODE. */
extern rtx copy_to_mode_reg ();
/* Copy given rtx to given temp reg and return that. */
extern rtx copy_to_suggested_reg ();
/* Copy a value to a register if it isn't already a register.
Args are mode (in case value is a constant) and the value. */
extern rtx force_reg ();
/* Return given rtx, copied into a new temp reg if it was in memory. */
extern rtx force_not_mem ();
/* Remove some bytes from the stack. An rtx says how many. */
extern void adjust_stack ();
/* Add some bytes to the stack. An rtx says how many. */
extern void anti_adjust_stack ();
/* Allocate some space on the stack dynamically and return its address. An rtx
says how many bytes. */
extern rtx allocate_dynamic_stack_space ();
/* Emit code to copy function value to a new temp reg and return that reg. */
extern rtx function_value ();
/* Return an rtx that refers to the value returned by a function
in its original home. This becomes invalid if any more code is emitted. */
extern rtx hard_function_value ();
/* Return an rtx that refers to the value returned by a library call
in its original home. This becomes invalid if any more code is emitted. */
extern rtx hard_libcall_value ();
/* Emit code to copy function value to a specified place. */
extern void copy_function_value ();
/* Given an rtx, return an rtx for a value rounded up to a multiple
of STACK_BOUNDARY / BITS_PER_UNIT. */
extern rtx round_push ();
/* Push a block of length SIZE (perhaps variable)
and return an rtx to address the beginning of the block. */
extern rtx push_block ();
/* Generate code for computing expression EXP,
and storing the value into TARGET.
If SUGGEST_REG is nonzero, copy the value through a register
and return that register, if that is possible. */
extern rtx store_expr ();
extern rtx prepare_call_address ();
extern rtx expand_call ();
extern void emit_call_1 ();
extern void emit_block_move ();
extern void emit_push_insn ();
extern void use_regs ();
extern void move_block_to_reg ();
extern rtx store_bit_field ();
extern rtx extract_bit_field ();
extern rtx expand_shift ();
extern rtx expand_mult ();
extern rtx expand_divmod ();
extern rtx expand_mult_add ();
extern rtx expand_stmt_expr ();
extern rtx emit_no_conflict_block ();
extern void emit_libcall_block ();
extern void jumpifnot ();
extern void jumpif ();
extern void do_jump ();
extern rtx assemble_static_space ();
extern void locate_and_pad_parm ();
extern rtx expand_inline_function ();
/* Hook called by expand_expr for language-specific tree codes.
It is up to the language front end to install a hook
if it has any such codes that expand_expr needs to know about. */
extern rtx (*lang_expand_expr) ();
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