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authorNathan Sidwell <nathan@acm.org>2020-01-20 05:39:59 -0800
committerNathan Sidwell <nathan@acm.org>2020-01-20 05:39:59 -0800
commitad1a3914ae8d67c94b0d2428e3f9672e7db491a1 (patch)
tree60f0771d802b20be5b8a827738e48324dcb24d2b /libcpp
parente82ba180d6641a1e2bad1ac327234fc1cda658ef (diff)
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[PR 80005] Fix __has_include
__has_include is funky in that it is macro-like from the POV of #ifdef and friends, but lexes its parenthesize argument #include-like. We were failing the second part of that, because we used a forwarding macro to an internal name, and hence always lexed the argument in macro-parameter context. We componded that by not setting the right flag when lexing, so it didn't even know. Mostly users got lucky. This reimplements the handline. 1) Remove the forwarding, but declare object-like macros that expand to themselves. This satisfies the #ifdef requirement 2) Correctly set angled_brackets when lexing the parameter. This tells the lexer (a) <...> is a header name and (b) "..." is too (not a string). 3) Remove the in__has_include lexer state, just tell find_file that that's what's happenning, so it doesn't emit an error. We lose the (undocumented) ability to #undef __has_include. That may well have been an accident of implementation. There are no tests for it. We gain __has_include behaviour for all users of the preprocessors -- not just the C-family ones that defined a forwarding macro. libcpp/ PR preprocessor/80005 * include/cpplib.h (BT_HAS_ATTRIBUTE): Fix comment. * internal.h (struct lexer_state): Delete in__has_include field. (struct spec_nodes): Rename n__has_include{,_next}__ fields. (_cpp_defined_macro_p): New. (_cpp_find_file): Add has_include parm. * directives.c (lex_macro_node): Combine defined, __has_inline{,_next} checking. (do_ifdef, do_ifndef): Use _cpp_defined_macro_p. (_cpp_init_directives): Refactor. * expr.c (parse_defined): Use _cpp_defined_macro_p. (eval_token): Adjust parse_has_include calls. (parse_has_include): Add OP parameter. Reimplement. * files.c (_cpp_find_file): Add HAS_INCLUDE parm. Use it to inhibit error message. (_cpp_stack_include): Adjust _cpp_find_file call. (_cpp_fake_include, _cpp_compare_file_date): Likewise. (open_file_failed): Remove in__has_include check. (_cpp_has_header): Adjust _cpp_find_file call. * identifiers.c (_cpp_init_hashtable): Don't init __has_include{,_next} here ... * init.c (cpp_init_builtins): ... init them here. Define as macros. (cpp_read_main_file): Adjust _cpp_find_file call. * pch.c (cpp_read_state): Adjust __has_include{,_next} access. * traditional.c (_cpp_scan_out_locgical_line): Likewise. gcc/c-family/ PR preprocessor/80005 * c-cppbuiltins.c (c_cpp_builtins): Don't define __has_include{,_next}. gcc/testsuite/ PR preprocessor/80005 * g++.dg/cpp1y/feat-cxx14.C: Adjust. * g++.dg/cpp1z/feat-cxx17.C: Adjust. * g++.dg/cpp2a/feat-cxx2a.C: Adjust. * g++.dg/cpp/pr80005.C: New.
Diffstat (limited to 'libcpp')
-rw-r--r--libcpp/ChangeLog29
-rw-r--r--libcpp/directives.c29
-rw-r--r--libcpp/expr.c32
-rw-r--r--libcpp/files.c27
-rw-r--r--libcpp/identifiers.c3
-rw-r--r--libcpp/include/cpplib.h2
-rw-r--r--libcpp/init.c14
-rw-r--r--libcpp/internal.h20
-rw-r--r--libcpp/pch.c4
-rw-r--r--libcpp/traditional.c8
10 files changed, 103 insertions, 65 deletions
diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog
index 3249b93..27a841b 100644
--- a/libcpp/ChangeLog
+++ b/libcpp/ChangeLog
@@ -1,4 +1,31 @@
-2020-01-17 Nathan Sidwell <nathan@acm.org>
+2020-01-20 Nathan Sidwell <nathan@acm.org>
+
+ PR preprocessor/80005
+ * include/cpplib.h (BT_HAS_ATTRIBUTE): Fix comment.
+ * internal.h (struct lexer_state): Delete in__has_include field.
+ (struct spec_nodes): Rename n__has_include{,_next}__ fields.
+ (_cpp_defined_macro_p): New.
+ (_cpp_find_file): Add has_include parm.
+ * directives.c (lex_macro_node): Combine defined,
+ __has_inline{,_next} checking.
+ (do_ifdef, do_ifndef): Use _cpp_defined_macro_p.
+ (_cpp_init_directives): Refactor.
+ * expr.c (parse_defined): Use _cpp_defined_macro_p.
+ (eval_token): Adjust parse_has_include calls.
+ (parse_has_include): Add OP parameter. Reimplement.
+ * files.c (_cpp_find_file): Add HAS_INCLUDE parm. Use it to
+ inhibit error message.
+ (_cpp_stack_include): Adjust _cpp_find_file call.
+ (_cpp_fake_include, _cpp_compare_file_date): Likewise.
+ (open_file_failed): Remove in__has_include check.
+ (_cpp_has_header): Adjust _cpp_find_file call.
+ * identifiers.c (_cpp_init_hashtable): Don't init
+ __has_include{,_next} here ...
+ * init.c (cpp_init_builtins): ... init them here. Define as
+ macros.
+ (cpp_read_main_file): Adjust _cpp_find_file call.
+ * pch.c (cpp_read_state): Adjust __has_include{,_next} access.
+ * traditional.c (_cpp_scan_out_locgical_line): Likewise.
PR preprocessor/93306
* expr.c (parse_has_include): Refactor. Check skip_eval before
diff --git a/libcpp/directives.c b/libcpp/directives.c
index 983206a..10735c8 100644
--- a/libcpp/directives.c
+++ b/libcpp/directives.c
@@ -595,14 +595,13 @@ lex_macro_node (cpp_reader *pfile, bool is_def_or_undef)
{
cpp_hashnode *node = token->val.node.node;
- if (is_def_or_undef && node == pfile->spec_nodes.n_defined)
+ if (is_def_or_undef
+ && (node == pfile->spec_nodes.n_defined
+ || node == pfile->spec_nodes.n__has_include
+ || node == pfile->spec_nodes.n__has_include_next))
cpp_error (pfile, CPP_DL_ERROR,
- "\"defined\" cannot be used as a macro name");
- else if (is_def_or_undef
- && (node == pfile->spec_nodes.n__has_include__
- || node == pfile->spec_nodes.n__has_include_next__))
- cpp_error (pfile, CPP_DL_ERROR,
- "\"__has_include__\" cannot be used as a macro name");
+ "\"%s\" cannot be used as a macro name",
+ NODE_NAME (node));
else if (! (node->flags & NODE_POISONED))
return node;
}
@@ -1966,11 +1965,7 @@ do_ifdef (cpp_reader *pfile)
if (node)
{
- /* Do not treat conditional macros as being defined. This is due to
- the powerpc port using conditional macros for 'vector', 'bool',
- and 'pixel' to act as conditional keywords. This messes up tests
- like #ifndef bool. */
- skip = !cpp_macro_p (node) || (node->flags & NODE_CONDITIONAL);
+ skip = !_cpp_defined_macro_p (node);
_cpp_mark_macro_used (node);
_cpp_maybe_notify_macro_use (pfile, node);
if (pfile->cb.used)
@@ -1999,8 +1994,7 @@ do_ifndef (cpp_reader *pfile)
the powerpc port using conditional macros for 'vector', 'bool',
and 'pixel' to act as conditional keywords. This messes up tests
like #ifndef bool. */
- skip = (cpp_macro_p (node)
- && !(node->flags & NODE_CONDITIONAL));
+ skip = _cpp_defined_macro_p (node);
_cpp_mark_macro_used (node);
_cpp_maybe_notify_macro_use (pfile, node);
if (pfile->cb.used)
@@ -2638,12 +2632,9 @@ _cpp_pop_buffer (cpp_reader *pfile)
void
_cpp_init_directives (cpp_reader *pfile)
{
- unsigned int i;
- cpp_hashnode *node;
-
- for (i = 0; i < (unsigned int) N_DIRECTIVES; i++)
+ for (int i = 0; i < N_DIRECTIVES; i++)
{
- node = cpp_lookup (pfile, dtable[i].name, dtable[i].length);
+ cpp_hashnode *node = cpp_lookup (pfile, dtable[i].name, dtable[i].length);
node->is_directive = 1;
node->directive_index = i;
}
diff --git a/libcpp/expr.c b/libcpp/expr.c
index 317faf5..df21a4b 100644
--- a/libcpp/expr.c
+++ b/libcpp/expr.c
@@ -64,7 +64,7 @@ static unsigned int interpret_float_suffix (cpp_reader *, const uchar *, size_t)
static unsigned int interpret_int_suffix (cpp_reader *, const uchar *, size_t);
static void check_promotion (cpp_reader *, const struct op *);
-static cpp_num parse_has_include (cpp_reader *, enum include_type);
+static cpp_num parse_has_include (cpp_reader *, cpp_hashnode *, include_type);
/* Token type abuse to create unary plus and minus operators. */
#define CPP_UPLUS ((enum cpp_ttype) (CPP_LAST_CPP_OP + 1))
@@ -1088,8 +1088,7 @@ parse_defined (cpp_reader *pfile)
result.unsignedp = false;
result.high = 0;
result.overflow = false;
- result.low = (node && cpp_macro_p (node)
- && !(node->flags & NODE_CONDITIONAL));
+ result.low = node && _cpp_defined_macro_p (node);
return result;
}
@@ -1160,10 +1159,10 @@ eval_token (cpp_reader *pfile, const cpp_token *token,
case CPP_NAME:
if (token->val.node.node == pfile->spec_nodes.n_defined)
return parse_defined (pfile);
- else if (token->val.node.node == pfile->spec_nodes.n__has_include__)
- return parse_has_include (pfile, IT_INCLUDE);
- else if (token->val.node.node == pfile->spec_nodes.n__has_include_next__)
- return parse_has_include (pfile, IT_INCLUDE_NEXT);
+ else if (token->val.node.node == pfile->spec_nodes.n__has_include)
+ return parse_has_include (pfile, token->val.node.node, IT_INCLUDE);
+ else if (token->val.node.node == pfile->spec_nodes.n__has_include_next)
+ return parse_has_include (pfile, token->val.node.node, IT_INCLUDE_NEXT);
else if (CPP_OPTION (pfile, cplusplus)
&& (token->val.node.node == pfile->spec_nodes.n_true
|| token->val.node.node == pfile->spec_nodes.n_false))
@@ -2190,9 +2189,9 @@ num_div_op (cpp_reader *pfile, cpp_num lhs, cpp_num rhs, enum cpp_ttype op,
return lhs;
}
-/* Handle meeting "__has_include__" in a preprocessor expression. */
+/* Handle meeting "__has_include" in a preprocessor expression. */
static cpp_num
-parse_has_include (cpp_reader *pfile, enum include_type type)
+parse_has_include (cpp_reader *pfile, cpp_hashnode *op, include_type type)
{
cpp_num result;
@@ -2201,12 +2200,15 @@ parse_has_include (cpp_reader *pfile, enum include_type type)
result.overflow = false;
result.low = 0;
- pfile->state.in__has_include__++;
-
+ pfile->state.angled_headers = true;
const cpp_token *token = cpp_get_token (pfile);
bool paren = token->type == CPP_OPEN_PAREN;
if (paren)
token = cpp_get_token (pfile);
+ else
+ cpp_error (pfile, CPP_DL_ERROR,
+ "missing '(' before \"%s\" operand", NODE_NAME (op));
+ pfile->state.angled_headers = false;
bool bracket = token->type != CPP_STRING;
cpp_hashnode *node = NULL;
@@ -2222,7 +2224,7 @@ parse_has_include (cpp_reader *pfile, enum include_type type)
fname = _cpp_bracket_include (pfile);
else
cpp_error (pfile, CPP_DL_ERROR,
- "operator \"__has_include__\" requires a header string");
+ "operator \"%s\" requires a header-name", NODE_NAME (op));
if (fname)
{
@@ -2237,14 +2239,10 @@ parse_has_include (cpp_reader *pfile, enum include_type type)
if (paren && !SEEN_EOL () && cpp_get_token (pfile)->type != CPP_CLOSE_PAREN)
cpp_error (pfile, CPP_DL_ERROR,
- "missing ')' after \"__has_include__\"");
+ "missing ')' after \"%s\" operand", NODE_NAME (op));
- /* A possible controlling macro of the form #if !__has_include__ ().
- _cpp_parse_expr checks there was no other junk on the line. */
if (node)
pfile->mi_ind_cmacro = node;
- pfile->state.in__has_include__--;
-
return result;
}
diff --git a/libcpp/files.c b/libcpp/files.c
index 7abae7a..260e787 100644
--- a/libcpp/files.c
+++ b/libcpp/files.c
@@ -504,7 +504,8 @@ _cpp_find_failed (_cpp_file *file)
_cpp_file *
_cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir,
- bool fake, int angle_brackets, bool implicit_preinclude,
+ int angle_brackets,
+ bool fake, bool implicit_preinclude, bool has_include,
location_t loc)
{
struct cpp_file_hash_entry *entry;
@@ -592,7 +593,8 @@ _cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir,
return NULL;
}
- open_file_failed (pfile, file, angle_brackets, loc);
+ if (!has_include)
+ open_file_failed (pfile, file, angle_brackets, loc);
break;
}
@@ -1046,8 +1048,8 @@ _cpp_stack_include (cpp_reader *pfile, const char *fname, int angle_brackets,
if (!dir)
return false;
- _cpp_file *file = _cpp_find_file (pfile, fname, dir, false, angle_brackets,
- type == IT_DEFAULT, loc);
+ _cpp_file *file = _cpp_find_file (pfile, fname, dir, angle_brackets,
+ false, type == IT_DEFAULT, false, loc);
if (type == IT_DEFAULT && file == NULL)
return false;
@@ -1062,9 +1064,6 @@ open_file_failed (cpp_reader *pfile, _cpp_file *file, int angle_brackets,
int sysp = pfile->line_table->highest_line > 1 && pfile->buffer ? pfile->buffer->sysp : 0;
bool print_dep = CPP_OPTION (pfile, deps.style) > (angle_brackets || !!sysp);
- if (pfile->state.in__has_include__)
- return;
-
errno = file->err_no;
if (print_dep && CPP_OPTION (pfile, deps.missing_files) && errno == ENOENT)
{
@@ -1343,7 +1342,8 @@ cpp_clear_file_cache (cpp_reader *pfile)
void
_cpp_fake_include (cpp_reader *pfile, const char *fname)
{
- _cpp_find_file (pfile, fname, pfile->buffer->file->dir, true, 0, false, 0);
+ _cpp_find_file (pfile, fname, pfile->buffer->file->dir,
+ 0, true, false, false, 0);
}
/* Not everyone who wants to set system-header-ness on a buffer can
@@ -1461,7 +1461,8 @@ _cpp_compare_file_date (cpp_reader *pfile, const char *fname,
if (!dir)
return -1;
- file = _cpp_find_file (pfile, fname, dir, false, angle_brackets, false, 0);
+ file = _cpp_find_file (pfile, fname, dir, angle_brackets,
+ false, false, false, 0);
if (file->err_no)
return -1;
@@ -2004,9 +2005,11 @@ _cpp_has_header (cpp_reader *pfile, const char *fname, int angle_brackets,
enum include_type type)
{
cpp_dir *start_dir = search_path_head (pfile, fname, angle_brackets, type);
- _cpp_file *file = _cpp_find_file (pfile, fname, start_dir,
- /*fake=*/false, angle_brackets,
- /*implicit_preinclude=*/false, 0);
+ _cpp_file *file = _cpp_find_file (pfile, fname, start_dir, angle_brackets,
+ /*fake=*/false,
+ /*implicit_preinclude=*/false,
+ /*has_include=*/true,
+ 0);
return file->err_no != ENOENT;
}
diff --git a/libcpp/identifiers.c b/libcpp/identifiers.c
index 562d8fe..9627e1b 100644
--- a/libcpp/identifiers.c
+++ b/libcpp/identifiers.c
@@ -72,8 +72,7 @@ _cpp_init_hashtable (cpp_reader *pfile, cpp_hash_table *table)
s->n__VA_ARGS__->flags |= NODE_DIAGNOSTIC;
s->n__VA_OPT__ = cpp_lookup (pfile, DSC("__VA_OPT__"));
s->n__VA_OPT__->flags |= NODE_DIAGNOSTIC;
- s->n__has_include__ = cpp_lookup (pfile, DSC("__has_include__"));
- s->n__has_include_next__ = cpp_lookup (pfile, DSC("__has_include_next__"));
+ /* __has_include{,_next} are inited in cpp_init_builtins. */
}
/* Tear down the identifier hash table. */
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index 1c26c36..56cbbd8 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -859,7 +859,7 @@ enum cpp_builtin_type
BT_PRAGMA, /* `_Pragma' operator */
BT_TIMESTAMP, /* `__TIMESTAMP__' */
BT_COUNTER, /* `__COUNTER__' */
- BT_HAS_ATTRIBUTE, /* `__has_attribute__(x)' */
+ BT_HAS_ATTRIBUTE, /* `__has_attribute(x)' */
BT_HAS_BUILTIN /* `__has_builtin(x)' */
};
diff --git a/libcpp/init.c b/libcpp/init.c
index 2b4923e..e798140 100644
--- a/libcpp/init.c
+++ b/libcpp/init.c
@@ -578,6 +578,17 @@ cpp_init_builtins (cpp_reader *pfile, int hosted)
if (CPP_OPTION (pfile, objc))
_cpp_define_builtin (pfile, "__OBJC__ 1");
+
+ /* These two behave as macros for #ifdef, but are evaluated
+ specially inside #if. */
+ _cpp_define_builtin (pfile, "__has_include __has_include");
+ _cpp_define_builtin (pfile, "__has_include_next __has_include_next");
+ pfile->spec_nodes.n__has_include
+ = cpp_lookup (pfile, DSC("__has_include"));
+ pfile->spec_nodes.n__has_include->flags |= NODE_DIAGNOSTIC;
+ pfile->spec_nodes.n__has_include_next
+ = cpp_lookup (pfile, DSC("__has_include_next"));
+ pfile->spec_nodes.n__has_include_next->flags |= NODE_DIAGNOSTIC;
}
/* Sanity-checks are dependent on command-line options, so it is
@@ -672,7 +683,8 @@ cpp_read_main_file (cpp_reader *pfile, const char *fname)
}
pfile->main_file
- = _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0, false,
+ = _cpp_find_file (pfile, fname, &pfile->no_search_path, /*angle=*/0,
+ /*fake=*/false, /*preinclude=*/false, /*hasinclude=*/false,
loc);
if (_cpp_find_failed (pfile->main_file))
return NULL;
diff --git a/libcpp/internal.h b/libcpp/internal.h
index 3623baf..5453c3b 100644
--- a/libcpp/internal.h
+++ b/libcpp/internal.h
@@ -268,9 +268,6 @@ struct lexer_state
/* Nonzero when parsing arguments to a function-like macro. */
unsigned char parsing_args;
- /* Nonzero if in a __has_include__ or __has_include_next__ statement. */
- unsigned char in__has_include__;
-
/* Nonzero if prevent_expansion is true only because output is
being discarded. */
unsigned char discarding_output;
@@ -293,8 +290,8 @@ struct spec_nodes
cpp_hashnode *n_false; /* C++ keyword false */
cpp_hashnode *n__VA_ARGS__; /* C99 vararg macros */
cpp_hashnode *n__VA_OPT__; /* C++ vararg macros */
- cpp_hashnode *n__has_include__; /* __has_include__ operator */
- cpp_hashnode *n__has_include_next__; /* __has_include_next__ operator */
+ cpp_hashnode *n__has_include; /* __has_include operator */
+ cpp_hashnode *n__has_include_next; /* __has_include_next operator */
};
typedef struct _cpp_line_note _cpp_line_note;
@@ -641,6 +638,16 @@ cpp_in_primary_file (cpp_reader *pfile)
return pfile->line_table->depth == 1;
}
+/* True if NODE is a macro for the purposes of ifdef, defined etc. */
+inline bool _cpp_defined_macro_p (cpp_hashnode *node)
+{
+ /* Do not treat conditional macros as being defined. This is due to
+ the powerpc port using conditional macros for 'vector', 'bool',
+ and 'pixel' to act as conditional keywords. This messes up tests
+ like #ifndef bool. */
+ return cpp_macro_p (node) && !(node->flags & NODE_CONDITIONAL);
+}
+
/* In macro.c */
extern void _cpp_notify_macro_use (cpp_reader *pfile, cpp_hashnode *node);
inline void _cpp_maybe_notify_macro_use (cpp_reader *pfile, cpp_hashnode *node)
@@ -674,7 +681,8 @@ extern void _cpp_destroy_hashtable (cpp_reader *);
/* In files.c */
typedef struct _cpp_file _cpp_file;
extern _cpp_file *_cpp_find_file (cpp_reader *, const char *, cpp_dir *,
- bool, int, bool, location_t);
+ int angle, bool fake, bool preinclude,
+ bool has_include, location_t);
extern bool _cpp_find_failed (_cpp_file *);
extern void _cpp_mark_file_once_only (cpp_reader *, struct _cpp_file *);
extern void _cpp_fake_include (cpp_reader *, const char *);
diff --git a/libcpp/pch.c b/libcpp/pch.c
index 607f805..e631050 100644
--- a/libcpp/pch.c
+++ b/libcpp/pch.c
@@ -811,8 +811,8 @@ cpp_read_state (cpp_reader *r, const char *name, FILE *f,
s->n_false = cpp_lookup (r, DSC("false"));
s->n__VA_ARGS__ = cpp_lookup (r, DSC("__VA_ARGS__"));
s->n__VA_OPT__ = cpp_lookup (r, DSC("__VA_OPT__"));
- s->n__has_include__ = cpp_lookup (r, DSC("__has_include__"));
- s->n__has_include_next__ = cpp_lookup (r, DSC("__has_include_next__"));
+ s->n__has_include = cpp_lookup (r, DSC("__has_include"));
+ s->n__has_include_next = cpp_lookup (r, DSC("__has_include_next"));
}
old_state = r->state;
diff --git a/libcpp/traditional.c b/libcpp/traditional.c
index 21c63b4..ff06d31 100644
--- a/libcpp/traditional.c
+++ b/libcpp/traditional.c
@@ -78,8 +78,8 @@ enum ls {ls_none = 0, /* Normal state. */
ls_hash, /* After # in preprocessor conditional. */
ls_predicate, /* After the predicate, maybe paren? */
ls_answer, /* In answer to predicate. */
- ls_has_include, /* After __has_include__. */
- ls_has_include_close}; /* Looking for ')' of __has_include__. */
+ ls_has_include, /* After __has_include. */
+ ls_has_include_close}; /* Looking for ')' of __has_include. */
/* Lexing TODO: Maybe handle space in escaped newlines. Stop lex.c
from recognizing comments and directives during its lexing pass. */
@@ -565,8 +565,8 @@ _cpp_scan_out_logical_line (cpp_reader *pfile, cpp_macro *macro,
continue;
}
else if (pfile->state.in_expression
- && (node == pfile->spec_nodes.n__has_include__
- || node == pfile->spec_nodes.n__has_include_next__))
+ && (node == pfile->spec_nodes.n__has_include
+ || node == pfile->spec_nodes.n__has_include_next))
{
lex_state = ls_has_include;
continue;