/* 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,
- 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+ Copyright (C) 1986-2014 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
/* A pointer to the current token pointed to by the iterator. */
const cpp_token **token_ptr;
/* A pointer to the "full" location of the current token. If
- -ftrack-macro-expansion is used this location tracks loci accross
+ -ftrack-macro-expansion is used this location tracks loci across
macro expansion. */
const source_location *location_ptr;
#ifdef ENABLE_CHECKING
static int enter_macro_context (cpp_reader *, cpp_hashnode *,
const cpp_token *, source_location);
-static int builtin_macro (cpp_reader *, cpp_hashnode *);
+static int builtin_macro (cpp_reader *, cpp_hashnode *, source_location);
static void push_ptoken_context (cpp_reader *, cpp_hashnode *, _cpp_buff *,
const cpp_token **, unsigned int);
static void push_extended_tokens_context (cpp_reader *, cpp_hashnode *,
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 bool paste_tokens (cpp_reader *, source_location,
+ const cpp_token **, const cpp_token *);
static void alloc_expanded_arg_mem (cpp_reader *, macro_arg *, size_t);
static void ensure_expanded_arg_room (cpp_reader *, macro_arg *, size_t, size_t *);
static void delete_macro_args (_cpp_buff*, unsigned num_args);
static cpp_hashnode* macro_of_context (cpp_context *context);
+static bool in_macro_expansion_p (cpp_reader *pfile);
+
/* Statistical counter tracking the number of macros that got
expanded. */
unsigned num_expanded_macros_counter = 0;
case BT_TIMESTAMP:
{
+ if (CPP_OPTION (pfile, warn_date_time))
+ cpp_warning (pfile, CPP_W_DATE_TIME, "macro \"%s\" might prevent "
+ "reproducible builds", NODE_NAME (node));
+
cpp_buffer *pbuffer = cpp_get_buffer (pfile);
if (pbuffer->timestamp == NULL)
{
case BT_DATE:
case BT_TIME:
+ if (CPP_OPTION (pfile, warn_date_time))
+ cpp_warning (pfile, CPP_W_DATE_TIME, "macro \"%s\" might prevent "
+ "reproducible builds", NODE_NAME (node));
if (pfile->date == NULL)
{
/* Allocate __DATE__ and __TIME__ strings from permanent
/* 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. */
+ return the token to the caller. LOC is the location of the expansion
+ point of the macro. */
static int
-builtin_macro (cpp_reader *pfile, cpp_hashnode *node)
+builtin_macro (cpp_reader *pfile, cpp_hashnode *node, source_location loc)
{
const uchar *buf;
size_t len;
/* Set pfile->cur_token as required by _cpp_lex_direct. */
pfile->cur_token = _cpp_temp_token (pfile);
- _cpp_push_token_context (pfile, NULL, _cpp_lex_direct (pfile), 1);
+ cpp_token *token = _cpp_lex_direct (pfile);
+ /* We should point to the expansion point of the builtin macro. */
+ token->src_loc = loc;
+ if (pfile->context->tokens_kind == TOKENS_KIND_EXTENDED)
+ {
+ /* We are tracking tokens resulting from macro expansion.
+ Create a macro line map and generate a virtual location for
+ the token resulting from the expansion of the built-in
+ macro. */
+ source_location *virt_locs = NULL;
+ _cpp_buff *token_buf = tokens_buff_new (pfile, 1, &virt_locs);
+ const line_map * map =
+ linemap_enter_macro (pfile->line_table, node,
+ token->src_loc, 1);
+ tokens_buff_add_token (token_buf, virt_locs, token,
+ pfile->line_table->builtin_location,
+ pfile->line_table->builtin_location,
+ map, /*macro_token_index=*/0);
+ push_extended_tokens_context (pfile, node, token_buf, virt_locs,
+ (const cpp_token **)token_buf->base,
+ 1);
+ }
+ else
+ _cpp_push_token_context (pfile, NULL, token, 1);
if (pfile->buffer->cur != pfile->buffer->rlimit)
cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"",
NODE_NAME (node));
|| token->type == CPP_WSTRING || token->type == CPP_WCHAR
|| token->type == CPP_STRING32 || token->type == CPP_CHAR32
|| token->type == CPP_STRING16 || token->type == CPP_CHAR16
- || token->type == CPP_UTF8STRING);
+ || token->type == CPP_UTF8STRING
+ || cpp_userdef_string_p (token->type)
+ || cpp_userdef_char_p (token->type));
/* Room for each char being written in octal, initial space and
final quote and NUL. */
/* 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. */
+ guaranteed to not have the PASTE_LEFT flag set. LOCATION is
+ the virtual location used for error reporting. */
static bool
-paste_tokens (cpp_reader *pfile, const cpp_token **plhs, const cpp_token *rhs)
+paste_tokens (cpp_reader *pfile, source_location location,
+ const cpp_token **plhs, const cpp_token *rhs)
{
unsigned char *buf, *end, *lhsend;
cpp_token *lhs;
/* Mandatory error for all apart from assembler. */
if (CPP_OPTION (pfile, lang) != CLK_ASM)
- cpp_error (pfile, CPP_DL_ERROR,
+ cpp_error_with_line (pfile, CPP_DL_ERROR, location, 0,
"pasting \"%s\" and \"%s\" does not give a valid preprocessing token",
buf, cpp_token_as_text (pfile, rhs));
return false;
cpp_context *context = pfile->context;
source_location virt_loc = 0;
- /* We must have been called on a token that appears at the left
- hand side of a ## operator. */
- if (!(lhs->flags & PASTE_LEFT))
+ /* We are expanding a macro and we must have been called on a token
+ that appears at the left hand side of a ## operator. */
+ if (macro_of_context (pfile->context) == NULL
+ || (!(lhs->flags & PASTE_LEFT)))
abort ();
if (context->tokens_kind == TOKENS_KIND_EXTENDED)
resulting pasted token to have the location of the current
*LHS, though. */
virt_loc = context->c.mc->cur_virt_loc[-1];
+ else
+ /* We are not tracking macro expansion. So the best virtual
+ location we can get here is the expansion point of the macro we
+ are currently expanding. */
+ virt_loc = pfile->invocation_location;
do
{
if (rhs->flags & PASTE_LEFT)
abort ();
}
- if (!paste_tokens (pfile, &lhs, rhs))
+ if (!paste_tokens (pfile, virt_loc, &lhs, rhs))
break;
}
while (rhs->flags & PASTE_LEFT);
if (argc < macro->paramc)
{
- /* As an extension, a rest argument is allowed to not appear in
+ /* As an extension, variadic arguments are 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", ). */
+ This is exactly the same as if an empty variadic list had been
+ supplied - 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");
+ {
+ if (CPP_OPTION (pfile, cplusplus))
+ cpp_error (pfile, CPP_DL_PEDWARN,
+ "ISO C++11 requires at least one argument "
+ "for the \"...\" in a variadic macro");
+ else
+ cpp_error (pfile, CPP_DL_PEDWARN,
+ "ISO C99 requires at least one argument "
+ "for the \"...\" in a variadic macro");
+ }
return true;
}
pfile->state.angled_headers = false;
+ /* From here to when we push the context for the macro later down
+ this function, we need to flag the fact that we are about to
+ expand a macro. This is useful when -ftrack-macro-expansion is
+ turned off. In that case, we need to record the location of the
+ expansion point of the top-most macro we are about to to expand,
+ into pfile->invocation_location. But we must not record any such
+ location once the process of expanding the macro starts; that is,
+ we must not do that recording between now and later down this
+ function where set this flag to FALSE. */
+ pfile->about_to_expand_macro_p = true;
+
if ((node->flags & NODE_BUILTIN) && !(node->flags & NODE_USED))
{
node->flags |= NODE_USED;
if (pragma_buff)
_cpp_release_buff (pfile, pragma_buff);
+ pfile->about_to_expand_macro_p = false;
return 0;
}
if (macro->paramc == 0)
{
+ unsigned tokens_count = macro_real_token_count (macro);
if (CPP_OPTION (pfile, track_macro_expansion))
{
- unsigned int i, count = macro->count;
+ unsigned int i;
const cpp_token *src = macro->exp.tokens;
const struct line_map *map;
source_location *virt_locs = NULL;
- _cpp_buff *macro_tokens =
- tokens_buff_new (pfile, count, &virt_locs);
+ _cpp_buff *macro_tokens
+ = tokens_buff_new (pfile, tokens_count, &virt_locs);
/* Create a macro map to record the locations of the
tokens that are involved in the expansion. LOCATION
is the location of the macro expansion point. */
- map = linemap_enter_macro (pfile->line_table,
- node, location, count);
- for (i = 0; i < count; ++i)
+ map = linemap_enter_macro (pfile->line_table,
+ node, location, tokens_count);
+ for (i = 0; i < tokens_count; ++i)
{
tokens_buff_add_token (macro_tokens, virt_locs,
src, src->src_loc,
virt_locs,
(const cpp_token **)
macro_tokens->base,
- count);
- num_macro_tokens_counter += count;
+ tokens_count);
}
else
- {
- unsigned tokens_count = macro_real_token_count (macro);
- _cpp_push_token_context (pfile, node, macro->exp.tokens,
- tokens_count);
- num_macro_tokens_counter += tokens_count;
- }
+ _cpp_push_token_context (pfile, node, macro->exp.tokens,
+ tokens_count);
+ num_macro_tokens_counter += tokens_count;
}
if (pragma_buff)
}
while (pragma_buff != NULL);
+ pfile->about_to_expand_macro_p = false;
return 2;
}
+ pfile->about_to_expand_macro_p = false;
return 1;
}
+ pfile->about_to_expand_macro_p = false;
/* Handle built-in macros and the _Pragma operator. */
- return builtin_macro (pfile, node);
+ return builtin_macro (pfile, node, location);
}
/* De-allocate the memory used by BUFF which is an array of instances
/* Set the INDEXth token of the macro argument ARG. TOKEN is the token
to set, LOCATION is its virtual location. "Virtual" location means
- the location that encodes loci accross macro expansion. Otherwise
+ the location that encodes loci across macro expansion. Otherwise
it has to be TOKEN->SRC_LOC. KIND is the kind of tokens the
argument ARG is supposed to contain. Note that ARG must be
tailored so that it has enough room to contain INDEX + 1 numbers of
/* Move the iterator one token forward. Note that if IT was
initialized on an argument that has a stringified token, moving it
- foward doesn't make sense as a stringified token is essentially one
+ forward doesn't make sense as a stringified token is essentially one
string. */
static void
macro_arg_token_iter_forward (macro_arg_token_iter *it)
&& ! CPP_OPTION (pfile, c99)
&& ! cpp_in_system_header (pfile))
{
- cpp_error (pfile, CPP_DL_PEDWARN,
- "invoking macro %s argument %d: "
- "empty macro arguments are undefined"
- " in ISO C90 and ISO C++98",
- NODE_NAME (node),
- src->val.macro_arg.arg_no);
+ if (CPP_OPTION (pfile, cplusplus))
+ cpp_error (pfile, CPP_DL_PEDWARN,
+ "invoking macro %s argument %d: "
+ "empty macro arguments are undefined"
+ " in ISO C++98",
+ NODE_NAME (node),
+ src->val.macro_arg.arg_no);
+ else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat))
+ cpp_error (pfile, CPP_DL_PEDWARN,
+ "invoking macro %s argument %d: "
+ "empty macro arguments are undefined"
+ " in ISO C90",
+ NODE_NAME (node),
+ src->val.macro_arg.arg_no);
}
+ else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat) > 0
+ && ! macro->syshdr
+ && ! cpp_in_system_header (pfile)
+ && ! CPP_OPTION (pfile, cplusplus))
+ cpp_error (pfile, CPP_DL_WARNING,
+ "invoking macro %s argument %d: "
+ "empty macro arguments are undefined"
+ " in ISO C90",
+ NODE_NAME (node),
+ src->val.macro_arg.arg_no);
/* Avoid paste on RHS (even case count == 0). */
if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT))
means -ftrack-macro-expansion is effect; it then points to where to
insert the virtual location of TOKEN. TOKEN is the token to
insert. VIRT_LOC is the virtual location of the token, i.e, the
- location possibly encoding its locus accross macro expansion. If
+ location possibly encoding its locus across macro expansion. If
TOKEN is an argument of a function-like macro (inside a macro
replacement list), PARM_DEF_LOC is the spelling location of the
macro parameter that TOKEN is replacing, in the replacement list of
reaches BUFFER's size; it aborts in that situation.
TOKEN is the token to append. VIRT_LOC is the virtual location of
- the token, i.e, the location possibly encoding its locus accross
+ the token, i.e, the location possibly encoding its locus across
macro expansion. If TOKEN is an argument of a function-like macro
(inside a macro replacement list), PARM_DEF_LOC is the location of
the macro parameter that TOKEN is replacing. If TOKEN doesn't come
: context->c.macro;
}
+/* Return TRUE iff we are expanding a macro or are about to start
+ expanding one. If we are effectively expanding a macro, the
+ function macro_of_context returns a pointer to the macro being
+ expanded. */
+static bool
+in_macro_expansion_p (cpp_reader *pfile)
+{
+ if (pfile == NULL)
+ return false;
+
+ return (pfile->about_to_expand_macro_p
+ || macro_of_context (pfile->context));
+}
+
/* Pop the current context off the stack, re-enabling the macro if the
context represented a macro's replacement list. Initially the
context structure was not freed so that we can re-use it later, but
{
cpp_context *context = pfile->context;
+ /* We should not be popping the base context. */
+ if (context == &pfile->base_context)
+ abort ();
+
if (context->c.macro)
{
cpp_hashnode *macro;
if (macro != NULL
/* Several contiguous macro expansion contexts can be
associated to the same macro; that means it's the same
- macro expansion that spans accross all these (sub)
+ macro expansion that spans across all these (sub)
contexts. So we should re-enable an expansion-disabled
macro only when we are sure we are really out of that
macro expansion. */
/* Consume the next token contained in the current context of PFILE,
and return it in *TOKEN. It's "full location" is returned in
*LOCATION. If -ftrack-macro-location is in effeect, fFull location"
- means the location encoding the locus of the token accross macro
+ means the location encoding the locus of the token across macro
expansion; otherwise it's just is the "normal" location of the
token which (*TOKEN)->src_loc. */
static inline void
cpp_get_token_1 (cpp_reader *pfile, source_location *location)
{
const cpp_token *result;
- bool can_set = pfile->set_invocation_location;
/* This token is a virtual token that either encodes a location
related to macro expansion or a spelling location. */
source_location virt_loc = 0;
- pfile->set_invocation_location = false;
+ /* pfile->about_to_expand_macro_p can be overriden by indirect calls
+ to functions that push macro contexts. So let's save it so that
+ we can restore it when we are about to leave this routine. */
+ bool saved_about_to_expand_macro = pfile->about_to_expand_macro_p;
for (;;)
{
int ret = 0;
/* If not in a macro context, and we're going to start an
expansion, record the location. */
- if (can_set && !context->c.macro)
+ if (!in_macro_expansion_p (pfile))
pfile->invocation_location = result->src_loc;
if (pfile->state.prevent_expansion)
break;
*location = virt_loc;
if (!CPP_OPTION (pfile, track_macro_expansion)
- && can_set
- && pfile->context->c.macro != NULL)
+ && macro_of_context (pfile->context) != NULL)
/* We are in a macro expansion context, are not tracking
virtual location, but were asked to report the location
of the expansion point of the macro being expanded. */
*location = maybe_adjust_loc_for_trad_cpp (pfile, *location);
}
+
+ pfile->about_to_expand_macro_p = saved_about_to_expand_macro;
return result;
}
const cpp_token *
cpp_get_token_with_location (cpp_reader *pfile, source_location *loc)
{
- const cpp_token *result;
-
- pfile->set_invocation_location = true;
- result = cpp_get_token_1 (pfile, loc);
- return result;
+ return cpp_get_token_1 (pfile, loc);
}
/* Returns true if we're expanding an object-like macro that was
if (! CPP_OPTION (pfile, c99)
&& CPP_OPTION (pfile, cpp_pedantic)
&& CPP_OPTION (pfile, warn_variadic_macros))
- cpp_pedwarning
- (pfile, CPP_W_VARIADIC_MACROS,
- "anonymous variadic macros were introduced in C99");
+ {
+ if (CPP_OPTION (pfile, cplusplus))
+ cpp_pedwarning
+ (pfile, CPP_W_VARIADIC_MACROS,
+ "anonymous variadic macros were introduced in C++11");
+ else
+ cpp_pedwarning
+ (pfile, CPP_W_VARIADIC_MACROS,
+ "anonymous variadic macros were introduced in C99");
+ }
+ else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat) > 0
+ && ! CPP_OPTION (pfile, cplusplus))
+ cpp_error (pfile, CPP_DL_WARNING,
+ "anonymous variadic macros were introduced in C99");
}
else if (CPP_OPTION (pfile, cpp_pedantic)
&& CPP_OPTION (pfile, warn_variadic_macros))
- cpp_pedwarning (pfile, CPP_W_VARIADIC_MACROS,
+ {
+ if (CPP_OPTION (pfile, cplusplus))
+ cpp_pedwarning (pfile, CPP_W_VARIADIC_MACROS,
+ "ISO C++ does not permit named variadic macros");
+ else
+ cpp_pedwarning (pfile, CPP_W_VARIADIC_MACROS,
"ISO C does not permit named variadic macros");
+ }
/* We're at the end, and just expect a closing parenthesis. */
token = _cpp_lex_token (pfile);
else if (ctoken->type != CPP_EOF && !(ctoken->flags & PREV_WHITE))
{
/* While ISO C99 requires whitespace before replacement text
- in a macro definition, ISO C90 with TC1 allows there characters
- from the basic source character set. */
+ in a macro definition, ISO C90 with TC1 allows characters
+ from the basic source character set there. */
if (CPP_OPTION (pfile, c99))
- cpp_error (pfile, CPP_DL_PEDWARN,
- "ISO C99 requires whitespace after the macro name");
+ {
+ if (CPP_OPTION (pfile, cplusplus))
+ cpp_error (pfile, CPP_DL_PEDWARN,
+ "ISO C++11 requires whitespace after the macro name");
+ else
+ cpp_error (pfile, CPP_DL_PEDWARN,
+ "ISO C99 requires whitespace after the macro name");
+ }
else
{
int warntype = CPP_DL_WARNING;
&& ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_FORMAT_MACROS")
/* __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS are mentioned
in the C standard, as something that one must use in C++.
- However DR#593 indicates that these aren't actually mentioned
- in the C++ standard. We special-case them anyway. */
+ However DR#593 and C++11 indicate that they play no role in C++.
+ We special-case them anyway. */
&& ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_LIMIT_MACROS")
&& ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_CONSTANT_MACROS"))
node->flags |= NODE_WARN;
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