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macro.c
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/* Part of CPP library. (Macro and #define handling.)
Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
Written by Per Bothner, 1994.
Based on CCCP program by Paul Rubin, June 1986
Adapted to ANSI C, Richard Stallman, Jan 1987
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
In other words, you are welcome to use, share and improve this program.
You are forbidden to forbid anyone else to use, share and improve
what you give them. Help stamp out software-hoarding! */
#include "config.h"
#include "system.h"
#include "cpplib.h"
#include "internal.h"
typedef struct macro_arg macro_arg;
struct macro_arg
{
const cpp_token **first; /* First token in unexpanded argument. */
const cpp_token **expanded; /* Macro-expanded argument. */
const cpp_token *stringified; /* Stringified argument. */
unsigned int count; /* # of tokens in argument. */
unsigned int expanded_count; /* # of tokens in expanded argument. */
};
/* Macro expansion. */
static int enter_macro_context (cpp_reader *, cpp_hashnode *);
static int builtin_macro (cpp_reader *, cpp_hashnode *);
static void push_token_context (cpp_reader *, cpp_hashnode *,
const cpp_token *, unsigned int);
static void push_ptoken_context (cpp_reader *, cpp_hashnode *, _cpp_buff *,
const cpp_token **, unsigned int);
static _cpp_buff *collect_args (cpp_reader *, const cpp_hashnode *);
static cpp_context *next_context (cpp_reader *);
static const cpp_token *padding_token (cpp_reader *, const cpp_token *);
static void expand_arg (cpp_reader *, macro_arg *);
static const cpp_token *new_string_token (cpp_reader *, uchar *, unsigned int);
static const cpp_token *stringify_arg (cpp_reader *, macro_arg *);
static void paste_all_tokens (cpp_reader *, const cpp_token *);
static bool paste_tokens (cpp_reader *, const cpp_token **, const cpp_token *);
static void replace_args (cpp_reader *, cpp_hashnode *, cpp_macro *,
macro_arg *);
static _cpp_buff *funlike_invocation_p (cpp_reader *, cpp_hashnode *);
static bool create_iso_definition (cpp_reader *, cpp_macro *);
/* #define directive parsing and handling. */
static cpp_token *alloc_expansion_token (cpp_reader *, cpp_macro *);
static cpp_token *lex_expansion_token (cpp_reader *, cpp_macro *);
static bool warn_of_redefinition (cpp_reader *, const cpp_hashnode *,
const cpp_macro *);
static bool parse_params (cpp_reader *, cpp_macro *);
static void check_trad_stringification (cpp_reader *, const cpp_macro *,
const cpp_string *);
/* Emits a warning if NODE is a macro defined in the main file that
has not been used. */
int
_cpp_warn_if_unused_macro (cpp_reader *pfile, cpp_hashnode *node,
void *v ATTRIBUTE_UNUSED)
{
if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
{
cpp_macro *macro = node->value.macro;
if (!macro->used
&& MAIN_FILE_P (linemap_lookup (pfile->line_table, macro->line)))
cpp_error_with_line (pfile, CPP_DL_WARNING, macro->line, 0,
"macro \"%s\" is not used", NODE_NAME (node));
}
return 1;
}
/* Allocates and returns a CPP_STRING token, containing TEXT of length
LEN, after null-terminating it. TEXT must be in permanent storage. */
static const cpp_token *
new_string_token (cpp_reader *pfile, unsigned char *text, unsigned int len)
{
cpp_token *token = _cpp_temp_token (pfile);
text[len] = '\0';
token->type = CPP_STRING;
token->val.str.len = len;
token->val.str.text = text;
token->flags = 0;
return token;
}
static const char * const monthnames[] =
{
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
/* Helper function for builtin_macro. Returns the text generated by
a builtin macro. */
const uchar *
_cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode *node)
{
const struct line_map *map;
const uchar *result = NULL;
unsigned int number = 1;
switch (node->value.builtin)
{
default:
cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"",
NODE_NAME (node));
break;
case BT_FILE:
case BT_BASE_FILE:
{
unsigned int len;
const char *name;
uchar *buf;
map = linemap_lookup (pfile->line_table, pfile->line_table->highest_line);
if (node->value.builtin == BT_BASE_FILE)
while (! MAIN_FILE_P (map))
map = INCLUDED_FROM (pfile->line_table, map);
name = map->to_file;
len = strlen (name);
buf = _cpp_unaligned_alloc (pfile, len * 4 + 3);
result = buf;
*buf = '"';
buf = cpp_quote_string (buf + 1, (const unsigned char *) name, len);
*buf++ = '"';
*buf = '\0';
}
break;
case BT_INCLUDE_LEVEL:
/* The line map depth counts the primary source as level 1, but
historically __INCLUDE_DEPTH__ has called the primary source
level 0. */
number = pfile->line_table->depth - 1;
break;
case BT_SPECLINE:
map = &pfile->line_table->maps[pfile->line_table->used-1];
/* If __LINE__ is embedded in a macro, it must expand to the
line of the macro's invocation, not its definition.
Otherwise things like assert() will not work properly. */
if (CPP_OPTION (pfile, traditional))
number = pfile->line_table->highest_line;
else
number = pfile->cur_token[-1].src_loc;
number = SOURCE_LINE (map, number);
break;
/* __STDC__ has the value 1 under normal circumstances.
However, if (a) we are in a system header, (b) the option
stdc_0_in_system_headers is true (set by target config), and
(c) we are not in strictly conforming mode, then it has the
value 0. */
case BT_STDC:
{
if (cpp_in_system_header (pfile)
&& CPP_OPTION (pfile, stdc_0_in_system_headers)
&& !CPP_OPTION (pfile,std))
number = 0;
else
number = 1;
}
break;
case BT_DATE:
case BT_TIME:
if (pfile->date == NULL)
{
/* Allocate __DATE__ and __TIME__ strings from permanent
storage. We only do this once, and don't generate them
at init time, because time() and localtime() are very
slow on some systems. */
time_t tt;
struct tm *tb = NULL;
/* (time_t) -1 is a legitimate value for "number of seconds
since the Epoch", so we have to do a little dance to
distinguish that from a genuine error. */
errno = 0;
tt = time(NULL);
if (tt != (time_t)-1 || errno == 0)
tb = localtime (&tt);
if (tb)
{
pfile->date = _cpp_unaligned_alloc (pfile,
sizeof ("\"Oct 11 1347\""));
sprintf ((char *) pfile->date, "\"%s %2d %4d\"",
monthnames[tb->tm_mon], tb->tm_mday,
tb->tm_year + 1900);
pfile->time = _cpp_unaligned_alloc (pfile,
sizeof ("\"12:34:56\""));
sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"",
tb->tm_hour, tb->tm_min, tb->tm_sec);
}
else
{
cpp_errno (pfile, CPP_DL_WARNING,
"could not determine date and time");
pfile->date = U"\"??? ?? ????\"";
pfile->time = U"\"??:??:??\"";
}
}
if (node->value.builtin == BT_DATE)
result = pfile->date;
else
result = pfile->time;
break;
}
if (result == NULL)
{
/* 21 bytes holds all NUL-terminated unsigned 64-bit numbers. */
result = _cpp_unaligned_alloc (pfile, 21);
sprintf ((char *) result, "%u", number);
}
return result;
}
/* Convert builtin macros like __FILE__ to a token and push it on the
context stack. Also handles _Pragma, for which a new token may not
be created. Returns 1 if it generates a new token context, 0 to
return the token to the caller. */
static int
builtin_macro (cpp_reader *pfile, cpp_hashnode *node)
{
const uchar *buf;
size_t len;
char *nbuf;
if (node->value.builtin == BT_PRAGMA)
{
/* Don't interpret _Pragma within directives. The standard is
not clear on this, but to me this makes most sense. */
if (pfile->state.in_directive)
return 0;
_cpp_do__Pragma (pfile);
if (pfile->directive_result.type == CPP_PRAGMA)
{
cpp_token *tok = _cpp_temp_token (pfile);
*tok = pfile->directive_result;
push_token_context (pfile, NULL, tok, 1);
}
return 1;
}
buf = _cpp_builtin_macro_text (pfile, node);
len = ustrlen (buf);
nbuf = (char *) alloca (len + 1);
memcpy (nbuf, buf, len);
nbuf[len]='\n';
cpp_push_buffer (pfile, (uchar *) nbuf, len, /* from_stage3 */ true);
_cpp_clean_line (pfile);
/* Set pfile->cur_token as required by _cpp_lex_direct. */
pfile->cur_token = _cpp_temp_token (pfile);
push_token_context (pfile, NULL, _cpp_lex_direct (pfile), 1);
if (pfile->buffer->cur != pfile->buffer->rlimit)
cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"",
NODE_NAME (node));
_cpp_pop_buffer (pfile);
return 1;
}
/* Copies SRC, of length LEN, to DEST, adding backslashes before all
backslashes and double quotes. Non-printable characters are
converted to octal. DEST must be of sufficient size. Returns
a pointer to the end of the string. */
uchar *
cpp_quote_string (uchar *dest, const uchar *src, unsigned int len)
{
while (len--)
{
uchar c = *src++;
if (c == '\\' || c == '"')
{
*dest++ = '\\';
*dest++ = c;
}
else
{
if (ISPRINT (c))
*dest++ = c;
else
{
sprintf ((char *) dest, "\\%03o", c);
dest += 4;
}
}
}
return dest;
}
/* Convert a token sequence ARG to a single string token according to
the rules of the ISO C #-operator. */
static const cpp_token *
stringify_arg (cpp_reader *pfile, macro_arg *arg)
{
unsigned char *dest;
unsigned int i, escape_it, backslash_count = 0;
const cpp_token *source = NULL;
size_t len;
if (BUFF_ROOM (pfile->u_buff) < 3)
_cpp_extend_buff (pfile, &pfile->u_buff, 3);
dest = BUFF_FRONT (pfile->u_buff);
*dest++ = '"';
/* Loop, reading in the argument's tokens. */
for (i = 0; i < arg->count; i++)
{
const cpp_token *token = arg->first[i];
if (token->type == CPP_PADDING)
{
if (source == NULL)
source = token->val.source;
continue;
}
escape_it = (token->type == CPP_STRING || token->type == CPP_WSTRING
|| token->type == CPP_CHAR || token->type == CPP_WCHAR);
/* Room for each char being written in octal, initial space and
final quote and NUL. */
len = cpp_token_len (token);
if (escape_it)
len *= 4;
len += 3;
if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < len)
{
size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff);
_cpp_extend_buff (pfile, &pfile->u_buff, len);
dest = BUFF_FRONT (pfile->u_buff) + len_so_far;
}
/* Leading white space? */
if (dest - 1 != BUFF_FRONT (pfile->u_buff))
{
if (source == NULL)
source = token;
if (source->flags & PREV_WHITE)
*dest++ = ' ';
}
source = NULL;
if (escape_it)
{
_cpp_buff *buff = _cpp_get_buff (pfile, len);
unsigned char *buf = BUFF_FRONT (buff);
len = cpp_spell_token (pfile, token, buf, true) - buf;
dest = cpp_quote_string (dest, buf, len);
_cpp_release_buff (pfile, buff);
}
else
dest = cpp_spell_token (pfile, token, dest, true);
if (token->type == CPP_OTHER && token->val.str.text[0] == '\\')
backslash_count++;
else
backslash_count = 0;
}
/* Ignore the final \ of invalid string literals. */
if (backslash_count & 1)
{
cpp_error (pfile, CPP_DL_WARNING,
"invalid string literal, ignoring final '\\'");
dest--;
}
/* Commit the memory, including NUL, and return the token. */
*dest++ = '"';
len = dest - BUFF_FRONT (pfile->u_buff);
BUFF_FRONT (pfile->u_buff) = dest + 1;
return new_string_token (pfile, dest - len, len);
}
/* Try to paste two tokens. On success, return nonzero. In any
case, PLHS is updated to point to the pasted token, which is
guaranteed to not have the PASTE_LEFT flag set. */
static bool
paste_tokens (cpp_reader *pfile, const cpp_token **plhs, const cpp_token *rhs)
{
unsigned char *buf, *end;
const cpp_token *lhs;
unsigned int len;
bool valid;
lhs = *plhs;
len = cpp_token_len (lhs) + cpp_token_len (rhs) + 1;
buf = (unsigned char *) alloca (len);
end = cpp_spell_token (pfile, lhs, buf, false);
/* Avoid comment headers, since they are still processed in stage 3.
It is simpler to insert a space here, rather than modifying the
lexer to ignore comments in some circumstances. Simply returning
false doesn't work, since we want to clear the PASTE_LEFT flag. */
if (lhs->type == CPP_DIV && rhs->type != CPP_EQ)
*end++ = ' ';
end = cpp_spell_token (pfile, rhs, end, false);
*end = '\n';
cpp_push_buffer (pfile, buf, end - buf, /* from_stage3 */ true);
_cpp_clean_line (pfile);
/* Set pfile->cur_token as required by _cpp_lex_direct. */
pfile->cur_token = _cpp_temp_token (pfile);
*plhs = _cpp_lex_direct (pfile);
valid = pfile->buffer->cur == pfile->buffer->rlimit;
_cpp_pop_buffer (pfile);
return valid;
}
/* Handles an arbitrarily long sequence of ## operators, with initial
operand LHS. This implementation is left-associative,
non-recursive, and finishes a paste before handling succeeding
ones. If a paste fails, we back up to the RHS of the failing ##
operator before pushing the context containing the result of prior
successful pastes, with the effect that the RHS appears in the
output stream after the pasted LHS normally. */
static void
paste_all_tokens (cpp_reader *pfile, const cpp_token *lhs)
{
const cpp_token *rhs;
cpp_context *context = pfile->context;
do
{
/* Take the token directly from the current context. We can do
this, because we are in the replacement list of either an
object-like macro, or a function-like macro with arguments
inserted. In either case, the constraints to #define
guarantee we have at least one more token. */
if (context->direct_p)
rhs = FIRST (context).token++;
else
rhs = *FIRST (context).ptoken++;
if (rhs->type == CPP_PADDING)
abort ();
if (!paste_tokens (pfile, &lhs, rhs))
{
_cpp_backup_tokens (pfile, 1);
/* Mandatory error for all apart from assembler. */
if (CPP_OPTION (pfile, lang) != CLK_ASM)
cpp_error (pfile, CPP_DL_ERROR,
"pasting \"%s\" and \"%s\" does not give a valid preprocessing token",
cpp_token_as_text (pfile, lhs),
cpp_token_as_text (pfile, rhs));
break;
}
}
while (rhs->flags & PASTE_LEFT);
/* Put the resulting token in its own context. */
push_token_context (pfile, NULL, lhs, 1);
}
/* Returns TRUE if the number of arguments ARGC supplied in an
invocation of the MACRO referenced by NODE is valid. An empty
invocation to a macro with no parameters should pass ARGC as zero.
Note that MACRO cannot necessarily be deduced from NODE, in case
NODE was redefined whilst collecting arguments. */
bool
_cpp_arguments_ok (cpp_reader *pfile, cpp_macro *macro, const cpp_hashnode *node, unsigned int argc)
{
if (argc == macro->paramc)
return true;
if (argc < macro->paramc)
{
/* As an extension, a rest argument is allowed to not appear in
the invocation at all.
e.g. #define debug(format, args...) something
debug("string");
This is exactly the same as if there had been an empty rest
argument - debug("string", ). */
if (argc + 1 == macro->paramc && macro->variadic)
{
if (CPP_PEDANTIC (pfile) && ! macro->syshdr)
cpp_error (pfile, CPP_DL_PEDWARN,
"ISO C99 requires rest arguments to be used");
return true;
}
cpp_error (pfile, CPP_DL_ERROR,
"macro \"%s\" requires %u arguments, but only %u given",
NODE_NAME (node), macro->paramc, argc);
}
else
cpp_error (pfile, CPP_DL_ERROR,
"macro \"%s\" passed %u arguments, but takes just %u",
NODE_NAME (node), argc, macro->paramc);
return false;
}
/* Reads and returns the arguments to a function-like macro
invocation. Assumes the opening parenthesis has been processed.
If there is an error, emits an appropriate diagnostic and returns
NULL. Each argument is terminated by a CPP_EOF token, for the
future benefit of expand_arg(). */
static _cpp_buff *
collect_args (cpp_reader *pfile, const cpp_hashnode *node)
{
_cpp_buff *buff, *base_buff;
cpp_macro *macro;
macro_arg *args, *arg;
const cpp_token *token;
unsigned int argc;
macro = node->value.macro;
if (macro->paramc)
argc = macro->paramc;
else
argc = 1;
buff = _cpp_get_buff (pfile, argc * (50 * sizeof (cpp_token *)
+ sizeof (macro_arg)));
base_buff = buff;
args = (macro_arg *) buff->base;
memset (args, 0, argc * sizeof (macro_arg));
buff->cur = (unsigned char *) &args[argc];
arg = args, argc = 0;
/* Collect the tokens making up each argument. We don't yet know
how many arguments have been supplied, whether too many or too
few. Hence the slightly bizarre usage of "argc" and "arg". */
do
{
unsigned int paren_depth = 0;
unsigned int ntokens = 0;
argc++;
arg->first = (const cpp_token **) buff->cur;
for (;;)
{
/* Require space for 2 new tokens (including a CPP_EOF). */
if ((unsigned char *) &arg->first[ntokens + 2] > buff->limit)
{
buff = _cpp_append_extend_buff (pfile, buff,
1000 * sizeof (cpp_token *));
arg->first = (const cpp_token **) buff->cur;
}
token = cpp_get_token (pfile);
if (token->type == CPP_PADDING)
{
/* Drop leading padding. */
if (ntokens == 0)
continue;
}
else if (token->type == CPP_OPEN_PAREN)
paren_depth++;
else if (token->type == CPP_CLOSE_PAREN)
{
if (paren_depth-- == 0)
break;
}
else if (token->type == CPP_COMMA)
{
/* A comma does not terminate an argument within
parentheses or as part of a variable argument. */
if (paren_depth == 0
&& ! (macro->variadic && argc == macro->paramc))
break;
}
else if (token->type == CPP_EOF
|| (token->type == CPP_HASH && token->flags & BOL))
break;
arg->first[ntokens++] = token;
}
/* Drop trailing padding. */
while (ntokens > 0 && arg->first[ntokens - 1]->type == CPP_PADDING)
ntokens--;
arg->count = ntokens;
arg->first[ntokens] = &pfile->eof;
/* Terminate the argument. Excess arguments loop back and
overwrite the final legitimate argument, before failing. */
if (argc <= macro->paramc)
{
buff->cur = (unsigned char *) &arg->first[ntokens + 1];
if (argc != macro->paramc)
arg++;
}
}
while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF);
if (token->type == CPP_EOF)
{
/* We still need the CPP_EOF to end directives, and to end
pre-expansion of a macro argument. Step back is not
unconditional, since we don't want to return a CPP_EOF to our
callers at the end of an -include-d file. */
if (pfile->context->prev || pfile->state.in_directive)
_cpp_backup_tokens (pfile, 1);
cpp_error (pfile, CPP_DL_ERROR,
"unterminated argument list invoking macro \"%s\"",
NODE_NAME (node));
}
else
{
/* A single empty argument is counted as no argument. */
if (argc == 1 && macro->paramc == 0 && args[0].count == 0)
argc = 0;
if (_cpp_arguments_ok (pfile, macro, node, argc))
{
/* GCC has special semantics for , ## b where b is a varargs
parameter: we remove the comma if b was omitted entirely.
If b was merely an empty argument, the comma is retained.
If the macro takes just one (varargs) parameter, then we
retain the comma only if we are standards conforming.
If FIRST is NULL replace_args () swallows the comma. */
if (macro->variadic && (argc < macro->paramc
|| (argc == 1 && args[0].count == 0
&& !CPP_OPTION (pfile, std))))
args[macro->paramc - 1].first = NULL;
return base_buff;
}
}
/* An error occurred. */
_cpp_release_buff (pfile, base_buff);
return NULL;
}
/* Search for an opening parenthesis to the macro of NODE, in such a
way that, if none is found, we don't lose the information in any
intervening padding tokens. If we find the parenthesis, collect
the arguments and return the buffer containing them. */
static _cpp_buff *
funlike_invocation_p (cpp_reader *pfile, cpp_hashnode *node)
{
const cpp_token *token, *padding = NULL;
for (;;)
{
token = cpp_get_token (pfile);
if (token->type != CPP_PADDING)
break;
if (padding == NULL
|| (!(padding->flags & PREV_WHITE) && token->val.source == NULL))
padding = token;
}
if (token->type == CPP_OPEN_PAREN)
{
pfile->state.parsing_args = 2;
return collect_args (pfile, node);
}
/* CPP_EOF can be the end of macro arguments, or the end of the
file. We mustn't back up over the latter. Ugh. */
if (token->type != CPP_EOF || token == &pfile->eof)
{
/* Back up. We may have skipped padding, in which case backing
up more than one token when expanding macros is in general
too difficult. We re-insert it in its own context. */
_cpp_backup_tokens (pfile, 1);
if (padding)
push_token_context (pfile, NULL, padding, 1);
}
return NULL;
}
/* Push the context of a macro with hash entry NODE onto the context
stack. If we can successfully expand the macro, we push a context
containing its yet-to-be-rescanned replacement list and return one.
Otherwise, we don't push a context and return zero. */
static int
enter_macro_context (cpp_reader *pfile, cpp_hashnode *node)
{
/* The presence of a macro invalidates a file's controlling macro. */
pfile->mi_valid = false;
pfile->state.angled_headers = false;
/* Handle standard macros. */
if (! (node->flags & NODE_BUILTIN))
{
cpp_macro *macro = node->value.macro;
if (macro->fun_like)
{
_cpp_buff *buff;
pfile->state.prevent_expansion++;
pfile->keep_tokens++;
pfile->state.parsing_args = 1;
buff = funlike_invocation_p (pfile, node);
pfile->state.parsing_args = 0;
pfile->keep_tokens--;
pfile->state.prevent_expansion--;
if (buff == NULL)
{
if (CPP_WTRADITIONAL (pfile) && ! node->value.macro->syshdr)
cpp_error (pfile, CPP_DL_WARNING,
"function-like macro \"%s\" must be used with arguments in traditional C",
NODE_NAME (node));
return 0;
}
if (macro->paramc > 0)
replace_args (pfile, node, macro, (macro_arg *) buff->base);
_cpp_release_buff (pfile, buff);
}
/* Disable the macro within its expansion. */
node->flags |= NODE_DISABLED;
macro->used = 1;
if (macro->paramc == 0)
push_token_context (pfile, node, macro->exp.tokens, macro->count);
return 1;
}
/* Handle built-in macros and the _Pragma operator. */
return builtin_macro (pfile, node);
}
/* Replace the parameters in a function-like macro of NODE with the
actual ARGS, and place the result in a newly pushed token context.
Expand each argument before replacing, unless it is operated upon
by the # or ## operators. */
static void
replace_args (cpp_reader *pfile, cpp_hashnode *node, cpp_macro *macro, macro_arg *args)
{
unsigned int i, total;
const cpp_token *src, *limit;
const cpp_token **dest, **first;
macro_arg *arg;
_cpp_buff *buff;
/* First, fully macro-expand arguments, calculating the number of
tokens in the final expansion as we go. The ordering of the if
statements below is subtle; we must handle stringification before
pasting. */
total = macro->count;
limit = macro->exp.tokens + macro->count;
for (src = macro->exp.tokens; src < limit; src++)
if (src->type == CPP_MACRO_ARG)
{
/* Leading and trailing padding tokens. */
total += 2;
/* We have an argument. If it is not being stringified or
pasted it is macro-replaced before insertion. */
arg = &args[src->val.arg_no - 1];
if (src->flags & STRINGIFY_ARG)
{
if (!arg->stringified)
arg->stringified = stringify_arg (pfile, arg);
}
else if ((src->flags & PASTE_LEFT)
|| (src > macro->exp.tokens && (src[-1].flags & PASTE_LEFT)))
total += arg->count - 1;
else
{
if (!arg->expanded)
expand_arg (pfile, arg);
total += arg->expanded_count - 1;
}
}
/* Now allocate space for the expansion, copy the tokens and replace
the arguments. */
buff = _cpp_get_buff (pfile, total * sizeof (cpp_token *));
first = (const cpp_token **) buff->base;
dest = first;
for (src = macro->exp.tokens; src < limit; src++)
{
unsigned int count;
const cpp_token **from, **paste_flag;
if (src->type != CPP_MACRO_ARG)
{
*dest++ = src;
continue;
}
paste_flag = 0;
arg = &args[src->val.arg_no - 1];
if (src->flags & STRINGIFY_ARG)
count = 1, from = &arg->stringified;
else if (src->flags & PASTE_LEFT)
count = arg->count, from = arg->first;
else if (src != macro->exp.tokens && (src[-1].flags & PASTE_LEFT))
{
count = arg->count, from = arg->first;
if (dest != first)
{
if (dest[-1]->type == CPP_COMMA
&& macro->variadic
&& src->val.arg_no == macro->paramc)
{
/* Swallow a pasted comma if from == NULL, otherwise
drop the paste flag. */
if (from == NULL)
dest--;
else
paste_flag = dest - 1;
}
/* Remove the paste flag if the RHS is a placemarker. */
else if (count == 0)
paste_flag = dest - 1;
}
}
else
count = arg->expanded_count, from = arg->expanded;
/* Padding on the left of an argument (unless RHS of ##). */
if ((!pfile->state.in_directive || pfile->state.directive_wants_padding)
&& src != macro->exp.tokens && !(src[-1].flags & PASTE_LEFT))
*dest++ = padding_token (pfile, src);
if (count)
{
memcpy (dest, from, count * sizeof (cpp_token *));
dest += count;
/* With a non-empty argument on the LHS of ##, the last
token should be flagged PASTE_LEFT. */
if (src->flags & PASTE_LEFT)
paste_flag = dest - 1;
}
/* Avoid paste on RHS (even case count == 0). */
if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT))
*dest++ = &pfile->avoid_paste;
/* Add a new paste flag, or remove an unwanted one. */
if (paste_flag)
{
cpp_token *token = _cpp_temp_token (pfile);
token->type = (*paste_flag)->type;
token->val = (*paste_flag)->val;
if (src->flags & PASTE_LEFT)
token->flags = (*paste_flag)->flags | PASTE_LEFT;
else
token->flags = (*paste_flag)->flags & ~PASTE_LEFT;
*paste_flag = token;
}
}
/* Free the expanded arguments. */
for (i = 0; i < macro->paramc; i++)
if (args[i].expanded)
free (args[i].expanded);
push_ptoken_context (pfile, node, buff, first, dest - first);
}
/* Return a special padding token, with padding inherited from SOURCE. */
static const cpp_token *
padding_token (cpp_reader *pfile, const cpp_token *source)
{
cpp_token *result = _cpp_temp_token (pfile);
result->type = CPP_PADDING;
/* Data in GCed data structures cannot be made const so far, so we
need a cast here. */
result->val.source = (cpp_token *) source;
result->flags = 0;
return result;
}
/* Get a new uninitialized context. Create a new one if we cannot
re-use an old one. */
static cpp_context *
next_context (cpp_reader *pfile)
{
cpp_context *result = pfile->context->next;
if (result == 0)
{
result = XNEW (cpp_context);
result->prev = pfile->context;
result->next = 0;
pfile->context->next = result;
}
pfile->context = result;
return result;
}
/* Push a list of pointers to tokens. */
static void
push_ptoken_context (cpp_reader *pfile, cpp_hashnode *macro, _cpp_buff *buff,
const cpp_token **first, unsigned int count)
{
cpp_context *context = next_context (pfile);
context->direct_p = false;
context->macro = macro;
context->buff = buff;
FIRST (context).ptoken = first;
LAST (context).ptoken = first + count;
}
/* Push a list of tokens. */
static void
push_token_context (cpp_reader *pfile, cpp_hashnode *macro,
const cpp_token *first, unsigned int count)
{
cpp_context *context = next_context (pfile);
context->direct_p = true;
context->macro = macro;
context->buff = NULL;
FIRST (context).token = first;
LAST (context).token = first + count;
}
/* Push a traditional macro's replacement text. */
void
_cpp_push_text_context (cpp_reader *pfile, cpp_hashnode *macro,
const uchar *start, size_t len)
{
cpp_context *context = next_context (pfile);
context->direct_p = true;
context->macro = macro;
context->buff = NULL;
CUR (context) = start;
RLIMIT (context) = start + len;
macro->flags |= NODE_DISABLED;
}
/* Expand an argument ARG before replacing parameters in a
function-like macro. This works by pushing a context with the
argument's tokens, and then expanding that into a temporary buffer
as if it were a normal part of the token stream. collect_args()
has terminated the argument's tokens with a CPP_EOF so that we know
when we have fully expanded the argument. */
static void
expand_arg (cpp_reader *pfile, macro_arg *arg)
{
unsigned int capacity;
bool saved_warn_trad;
if (arg->count == 0)
return;
/* Don't warn about funlike macros when pre-expanding. */
saved_warn_trad = CPP_WTRADITIONAL (pfile);
CPP_WTRADITIONAL (pfile) = 0;