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cpphash.h (struct cpp_buffer): Remove backup_to.

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* cpphash.h (struct cpp_buffer): Remove backup_to.
	* cpplex.c (BACKUP, get_effective_char): Die.
	(_cpp_skip_block_comment): Assume '*' is location on entry.
	(continues_identifier_p): Respect -fno-dollars-in-identifiers.
	(IF_NEXT_IS): Update.
	(_cpp_lex_direct): Don't use backup_to; look ahead directly.

From-SVN: r65819
This commit is contained in:
Neil Booth 2003-04-19 16:34:33 +00:00 committed by Neil Booth
parent ced2ad7687
commit 6f572ac229
3 changed files with 109 additions and 162 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2003-04-19 Neil Booth <neil@daikokuya.co.uk>
* cpphash.h (struct cpp_buffer): Remove backup_to.
* cpplex.c (BACKUP, get_effective_char): Die.
(_cpp_skip_block_comment): Assume '*' is location on entry.
(continues_identifier_p): Respect -fno-dollars-in-identifiers.
(IF_NEXT_IS): Update.
(_cpp_lex_direct): Don't use backup_to; look ahead directly.
2003-04-19 Matt Kraai <kraai@alumni.cmu.edu>
* README.Portability: Move to a new section and obsolete K+R

2
gcc/cpphash.h
View File

@ -267,8 +267,6 @@ struct cpp_buffer
struct cpp_buffer *prev;
const unsigned char *backup_to; /* Soon to die. */
/* Pointer into the include table; non-NULL if this is a file
buffer. Used for include_next and to record control macros. */
struct include_file *inc;

260
gcc/cpplex.c
View File

@ -55,11 +55,8 @@ static const struct token_spelling token_spellings[N_TTYPES] = { TTYPE_TABLE };
#define TOKEN_SPELL(token) (token_spellings[(token)->type].category)
#define TOKEN_NAME(token) (token_spellings[(token)->type].name)
#define BACKUP() do {buffer->cur = buffer->backup_to;} while (0)
static void add_line_note PARAMS ((cpp_buffer *, const uchar *, unsigned int));
static cppchar_t get_effective_char PARAMS ((cpp_reader *));
static int skip_line_comment PARAMS ((cpp_reader *));
static void skip_whitespace PARAMS ((cpp_reader *, cppchar_t));
static cpp_hashnode *lex_identifier PARAMS ((cpp_reader *));
@ -246,24 +243,11 @@ _cpp_process_line_notes (pfile, in_comment)
}
}
/* Obtain the next character, after trigraph conversion and skipping
an arbitrarily long string of escaped newlines. The common case of
no trigraphs or escaped newlines falls through quickly. On return,
buffer->backup_to points to where to return to if the character is
not to be processed. */
static cppchar_t
get_effective_char (pfile)
cpp_reader *pfile;
{
cpp_buffer *buffer = pfile->buffer;
buffer->backup_to = buffer->cur;
return *buffer->cur++;
}
/* Skip a C-style block comment. We find the end of the comment by
seeing if an asterisk is before every '/' we encounter. Returns
nonzero if comment terminated by EOF, zero otherwise. */
nonzero if comment terminated by EOF, zero otherwise.
Buffer->cur points to the initial asterisk of the comment. */
bool
_cpp_skip_block_comment (pfile)
cpp_reader *pfile;
@ -271,6 +255,7 @@ _cpp_skip_block_comment (pfile)
cpp_buffer *buffer = pfile->buffer;
cppchar_t c;
buffer->cur++;
if (*buffer->cur == '/')
buffer->cur++;
@ -381,7 +366,7 @@ static bool
continues_identifier_p (pfile)
cpp_reader *pfile;
{
if (*pfile->buffer->cur != '$')
if (*pfile->buffer->cur != '$' || !CPP_OPTION (pfile, dollars_in_ident))
return false;
if (CPP_PEDANTIC (pfile) && !pfile->state.skipping && !pfile->warned_dollar)
@ -492,8 +477,7 @@ lex_string (pfile, token)
{
cppchar_t c = *buffer->cur++;
/* In #include-style directives, terminators are not escapable.
\n can follow the '\\' if the file's last byte is '\\'. */
/* In #include-style directives, terminators are not escapable. */
if (c == '\\' && !pfile->state.angled_headers && *buffer->cur != '\n')
buffer->cur++;
else if (c == terminator || c == '\n')
@ -728,16 +712,14 @@ _cpp_get_fresh_line (pfile)
}
}
#define IF_NEXT_IS(CHAR, THEN_TYPE, ELSE_TYPE) \
do { \
if (get_effective_char (pfile) == CHAR) \
result->type = THEN_TYPE; \
else \
{ \
BACKUP (); \
result->type = ELSE_TYPE; \
} \
} while (0)
#define IF_NEXT_IS(CHAR, THEN_TYPE, ELSE_TYPE) \
do \
{ \
result->type = ELSE_TYPE; \
if (*buffer->cur == CHAR) \
buffer->cur++, result->type = THEN_TYPE; \
} \
while (0)
/* Lex a token into pfile->cur_token, which is also incremented, to
get diagnostics pointing to the correct location.
@ -853,8 +835,8 @@ _cpp_lex_direct (pfile)
case '/':
/* A potential block or line comment. */
comment_start = buffer->cur;
c = get_effective_char (pfile);
c = *buffer->cur;
if (c == '*')
{
if (_cpp_skip_block_comment (pfile))
@ -880,12 +862,12 @@ _cpp_lex_direct (pfile)
}
else if (c == '=')
{
buffer->cur++;
result->type = CPP_DIV_EQ;
break;
}
else
{
BACKUP ();
result->type = CPP_DIV;
break;
}
@ -908,179 +890,137 @@ _cpp_lex_direct (pfile)
break;
}
c = get_effective_char (pfile);
if (c == '=')
result->type = CPP_LESS_EQ;
else if (c == '<')
IF_NEXT_IS ('=', CPP_LSHIFT_EQ, CPP_LSHIFT);
else if (c == '?' && CPP_OPTION (pfile, cplusplus))
IF_NEXT_IS ('=', CPP_MIN_EQ, CPP_MIN);
else if (c == ':' && CPP_OPTION (pfile, digraphs))
result->type = CPP_LESS;
if (*buffer->cur == '=')
buffer->cur++, result->type = CPP_LESS_EQ;
else if (*buffer->cur == '<')
{
result->type = CPP_OPEN_SQUARE;
result->flags |= DIGRAPH;
buffer->cur++;
IF_NEXT_IS ('=', CPP_LSHIFT_EQ, CPP_LSHIFT);
}
else if (c == '%' && CPP_OPTION (pfile, digraphs))
else if (*buffer->cur == '?' && CPP_OPTION (pfile, cplusplus))
{
result->type = CPP_OPEN_BRACE;
result->flags |= DIGRAPH;
buffer->cur++;
IF_NEXT_IS ('=', CPP_MIN_EQ, CPP_MIN);
}
else
else if (CPP_OPTION (pfile, digraphs))
{
BACKUP ();
result->type = CPP_LESS;
if (*buffer->cur == ':')
{
buffer->cur++;
result->flags |= DIGRAPH;
result->type = CPP_OPEN_SQUARE;
}
else if (*buffer->cur == '%')
{
buffer->cur++;
result->flags |= DIGRAPH;
result->type = CPP_OPEN_BRACE;
}
}
break;
case '>':
c = get_effective_char (pfile);
if (c == '=')
result->type = CPP_GREATER_EQ;
else if (c == '>')
IF_NEXT_IS ('=', CPP_RSHIFT_EQ, CPP_RSHIFT);
else if (c == '?' && CPP_OPTION (pfile, cplusplus))
IF_NEXT_IS ('=', CPP_MAX_EQ, CPP_MAX);
else
result->type = CPP_GREATER;
if (*buffer->cur == '=')
buffer->cur++, result->type = CPP_GREATER_EQ;
else if (*buffer->cur == '>')
{
BACKUP ();
result->type = CPP_GREATER;
buffer->cur++;
IF_NEXT_IS ('=', CPP_RSHIFT_EQ, CPP_RSHIFT);
}
else if (*buffer->cur == '?' && CPP_OPTION (pfile, cplusplus))
{
buffer->cur++;
IF_NEXT_IS ('=', CPP_MAX_EQ, CPP_MAX);
}
break;
case '%':
c = get_effective_char (pfile);
if (c == '=')
result->type = CPP_MOD_EQ;
else if (CPP_OPTION (pfile, digraphs) && c == ':')
result->type = CPP_MOD;
if (*buffer->cur == '=')
buffer->cur++, result->type = CPP_MOD_EQ;
else if (CPP_OPTION (pfile, digraphs))
{
result->flags |= DIGRAPH;
result->type = CPP_HASH;
if (get_effective_char (pfile) == '%')
if (*buffer->cur == ':')
{
const unsigned char *pos = buffer->cur;
if (get_effective_char (pfile) == ':')
result->type = CPP_PASTE;
else
buffer->cur = pos - 1;
buffer->cur++;
result->flags |= DIGRAPH;
result->type = CPP_HASH;
if (*buffer->cur == '%' && buffer->cur[1] == ':')
buffer->cur += 2, result->type = CPP_PASTE;
}
else if (*buffer->cur == '>')
{
buffer->cur++;
result->flags |= DIGRAPH;
result->type = CPP_CLOSE_BRACE;
}
else
BACKUP ();
}
else if (CPP_OPTION (pfile, digraphs) && c == '>')
{
result->flags |= DIGRAPH;
result->type = CPP_CLOSE_BRACE;
}
else
{
BACKUP ();
result->type = CPP_MOD;
}
break;
case '.':
result->type = CPP_DOT;
c = get_effective_char (pfile);
if (c == '.')
if (ISDIGIT (*buffer->cur))
{
const unsigned char *pos = buffer->cur;
if (get_effective_char (pfile) == '.')
result->type = CPP_ELLIPSIS;
else
buffer->cur = pos - 1;
}
/* All known character sets have 0...9 contiguous. */
else if (ISDIGIT (c))
{
buffer->cur--;
result->type = CPP_NUMBER;
lex_number (pfile, &result->val.str);
}
else if (c == '*' && CPP_OPTION (pfile, cplusplus))
result->type = CPP_DOT_STAR;
else
BACKUP ();
else if (*buffer->cur == '.' && buffer->cur[1] == '.')
buffer->cur += 2, result->type = CPP_ELLIPSIS;
else if (*buffer->cur == '*' && CPP_OPTION (pfile, cplusplus))
buffer->cur++, result->type = CPP_DOT_STAR;
break;
case '+':
c = get_effective_char (pfile);
if (c == '+')
result->type = CPP_PLUS_PLUS;
else if (c == '=')
result->type = CPP_PLUS_EQ;
else
{
BACKUP ();
result->type = CPP_PLUS;
}
result->type = CPP_PLUS;
if (*buffer->cur == '+')
buffer->cur++, result->type = CPP_PLUS_PLUS;
else if (*buffer->cur == '=')
buffer->cur++, result->type = CPP_PLUS_EQ;
break;
case '-':
c = get_effective_char (pfile);
if (c == '>')
result->type = CPP_MINUS;
if (*buffer->cur == '>')
{
buffer->cur++;
result->type = CPP_DEREF;
if (CPP_OPTION (pfile, cplusplus))
{
if (get_effective_char (pfile) == '*')
result->type = CPP_DEREF_STAR;
else
BACKUP ();
}
}
else if (c == '-')
result->type = CPP_MINUS_MINUS;
else if (c == '=')
result->type = CPP_MINUS_EQ;
else
{
BACKUP ();
result->type = CPP_MINUS;
if (*buffer->cur == '*' && CPP_OPTION (pfile, cplusplus))
buffer->cur++, result->type = CPP_DEREF_STAR;
}
else if (*buffer->cur == '-')
buffer->cur++, result->type = CPP_MINUS_MINUS;
else if (*buffer->cur == '=')
buffer->cur++, result->type = CPP_MINUS_EQ;
break;
case '&':
c = get_effective_char (pfile);
if (c == '&')
result->type = CPP_AND_AND;
else if (c == '=')
result->type = CPP_AND_EQ;
else
{
BACKUP ();
result->type = CPP_AND;
}
result->type = CPP_AND;
if (*buffer->cur == '&')
buffer->cur++, result->type = CPP_AND_AND;
else if (*buffer->cur == '=')
buffer->cur++, result->type = CPP_AND_EQ;
break;
case '|':
c = get_effective_char (pfile);
if (c == '|')
result->type = CPP_OR_OR;
else if (c == '=')
result->type = CPP_OR_EQ;
else
{
BACKUP ();
result->type = CPP_OR;
}
result->type = CPP_OR;
if (*buffer->cur == '|')
buffer->cur++, result->type = CPP_OR_OR;
else if (*buffer->cur == '=')
buffer->cur++, result->type = CPP_OR_EQ;
break;
case ':':
c = get_effective_char (pfile);
if (c == ':' && CPP_OPTION (pfile, cplusplus))
result->type = CPP_SCOPE;
else if (c == '>' && CPP_OPTION (pfile, digraphs))
result->type = CPP_COLON;
if (*buffer->cur == ':' && CPP_OPTION (pfile, cplusplus))
buffer->cur++, result->type = CPP_SCOPE;
else if (*buffer->cur == '>' && CPP_OPTION (pfile, digraphs))
{
buffer->cur++;
result->flags |= DIGRAPH;
result->type = CPP_CLOSE_SQUARE;
}
else
{
BACKUP ();
result->type = CPP_COLON;
}
break;
case '*': IF_NEXT_IS ('=', CPP_MULT_EQ, CPP_MULT); break;