X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=libcpp%2Finit.c;fp=libcpp%2Finit.c;h=7fb21489499280f4860a2936a5f57ae1dce82f30;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=0000000000000000000000000000000000000000;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git

diff --git a/libcpp/init.c b/libcpp/init.c
new file mode 100644
index 00000000..7fb21489
--- /dev/null
+++ b/libcpp/init.c
@@ -0,0 +1,699 @@
+/* CPP Library.
+   Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2009
+   Free Software Foundation, Inc.
+   Contributed by Per Bothner, 1994-95.
+   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 3, 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; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "cpplib.h"
+#include "internal.h"
+#include "mkdeps.h"
+#include "localedir.h"
+
+static void init_library (void);
+static void mark_named_operators (cpp_reader *);
+static void read_original_filename (cpp_reader *);
+static void read_original_directory (cpp_reader *);
+static void post_options (cpp_reader *);
+
+/* If we have designated initializers (GCC >2.7) these tables can be
+   initialized, constant data.  Otherwise, they have to be filled in at
+   runtime.  */
+#if HAVE_DESIGNATED_INITIALIZERS
+
+#define init_trigraph_map()  /* Nothing.  */
+#define TRIGRAPH_MAP \
+__extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
+
+#define END };
+#define s(p, v) [p] = v,
+
+#else
+
+#define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \
+ static void init_trigraph_map (void) { \
+ unsigned char *x = _cpp_trigraph_map;
+
+#define END }
+#define s(p, v) x[p] = v;
+
+#endif
+
+TRIGRAPH_MAP
+  s('=', '#')	s(')', ']')	s('!', '|')
+  s('(', '[')	s('\'', '^')	s('>', '}')
+  s('/', '\\')	s('<', '{')	s('-', '~')
+END
+
+#undef s
+#undef END
+#undef TRIGRAPH_MAP
+
+/* A set of booleans indicating what CPP features each source language
+   requires.  */
+struct lang_flags
+{
+  char c99;
+  char cplusplus;
+  char extended_numbers;
+  char extended_identifiers;
+  char std;
+  char cplusplus_comments;
+  char digraphs;
+  char uliterals;
+};
+
+static const struct lang_flags lang_defaults[] =
+{ /*              c99 c++ xnum xid std  //   digr ulit */
+  /* GNUC89   */  { 0,  0,  1,   0,  0,   1,   1,   0 },
+  /* GNUC99   */  { 1,  0,  1,   0,  0,   1,   1,   1 },
+  /* STDC89   */  { 0,  0,  0,   0,  1,   0,   0,   0 },
+  /* STDC94   */  { 0,  0,  0,   0,  1,   0,   1,   0 },
+  /* STDC99   */  { 1,  0,  1,   0,  1,   1,   1,   0 },
+  /* GNUCXX   */  { 0,  1,  1,   0,  0,   1,   1,   0 },
+  /* CXX98    */  { 0,  1,  1,   0,  1,   1,   1,   0 },
+  /* GNUCXX0X */  { 1,  1,  1,   0,  0,   1,   1,   1 },
+  /* CXX0X    */  { 1,  1,  1,   0,  1,   1,   1,   1 },
+  /* ASM      */  { 0,  0,  1,   0,  0,   1,   0,   0 }
+  /* xid should be 1 for GNUC99, STDC99, GNUCXX, CXX98, GNUCXX0X, and
+     CXX0X when no longer experimental (when all uses of identifiers
+     in the compiler have been audited for correct handling of
+     extended identifiers).  */
+};
+
+/* Sets internal flags correctly for a given language.  */
+void
+cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
+{
+  const struct lang_flags *l = &lang_defaults[(int) lang];
+
+  CPP_OPTION (pfile, lang) = lang;
+
+  CPP_OPTION (pfile, c99)			 = l->c99;
+  CPP_OPTION (pfile, cplusplus)			 = l->cplusplus;
+  CPP_OPTION (pfile, extended_numbers)		 = l->extended_numbers;
+  CPP_OPTION (pfile, extended_identifiers)	 = l->extended_identifiers;
+  CPP_OPTION (pfile, std)			 = l->std;
+  CPP_OPTION (pfile, trigraphs)			 = l->std;
+  CPP_OPTION (pfile, cplusplus_comments)	 = l->cplusplus_comments;
+  CPP_OPTION (pfile, digraphs)			 = l->digraphs;
+  CPP_OPTION (pfile, uliterals)			 = l->uliterals;
+}
+
+/* Initialize library global state.  */
+static void
+init_library (void)
+{
+  static int initialized = 0;
+
+  if (! initialized)
+    {
+      initialized = 1;
+
+      /* Set up the trigraph map.  This doesn't need to do anything if
+	 we were compiled with a compiler that supports C99 designated
+	 initializers.  */
+      init_trigraph_map ();
+
+#ifdef ENABLE_NLS
+       (void) bindtextdomain (PACKAGE, LOCALEDIR);
+#endif
+    }
+}
+
+/* Initialize a cpp_reader structure.  */
+cpp_reader *
+cpp_create_reader (enum c_lang lang, hash_table *table,
+		   struct line_maps *line_table)
+{
+  cpp_reader *pfile;
+
+  /* Initialize this instance of the library if it hasn't been already.  */
+  init_library ();
+
+  pfile = XCNEW (cpp_reader);
+
+  cpp_set_lang (pfile, lang);
+  CPP_OPTION (pfile, warn_multichar) = 1;
+  CPP_OPTION (pfile, discard_comments) = 1;
+  CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
+  CPP_OPTION (pfile, show_column) = 1;
+  CPP_OPTION (pfile, tabstop) = 8;
+  CPP_OPTION (pfile, operator_names) = 1;
+  CPP_OPTION (pfile, warn_trigraphs) = 2;
+  CPP_OPTION (pfile, warn_endif_labels) = 1;
+  CPP_OPTION (pfile, warn_deprecated) = 1;
+  CPP_OPTION (pfile, warn_long_long) = !CPP_OPTION (pfile, c99);
+  CPP_OPTION (pfile, dollars_in_ident) = 1;
+  CPP_OPTION (pfile, warn_dollars) = 1;
+  CPP_OPTION (pfile, warn_variadic_macros) = 1;
+  CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1;
+  CPP_OPTION (pfile, warn_normalize) = normalized_C;
+
+  /* Default CPP arithmetic to something sensible for the host for the
+     benefit of dumb users like fix-header.  */
+  CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
+  CPP_OPTION (pfile, char_precision) = CHAR_BIT;
+  CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
+  CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
+  CPP_OPTION (pfile, unsigned_char) = 0;
+  CPP_OPTION (pfile, unsigned_wchar) = 1;
+  CPP_OPTION (pfile, bytes_big_endian) = 1;  /* does not matter */
+
+  /* Default to no charset conversion.  */
+  CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
+  CPP_OPTION (pfile, wide_charset) = 0;
+
+  /* Default the input character set to UTF-8.  */
+  CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
+
+  /* A fake empty "directory" used as the starting point for files
+     looked up without a search path.  Name cannot be '/' because we
+     don't want to prepend anything at all to filenames using it.  All
+     other entries are correct zero-initialized.  */
+  pfile->no_search_path.name = (char *) "";
+
+  /* Initialize the line map.  */
+  pfile->line_table = line_table;
+
+  /* Initialize lexer state.  */
+  pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
+
+  /* Set up static tokens.  */
+  pfile->avoid_paste.type = CPP_PADDING;
+  pfile->avoid_paste.val.source = NULL;
+  pfile->eof.type = CPP_EOF;
+  pfile->eof.flags = 0;
+
+  /* Create a token buffer for the lexer.  */
+  _cpp_init_tokenrun (&pfile->base_run, 250);
+  pfile->cur_run = &pfile->base_run;
+  pfile->cur_token = pfile->base_run.base;
+
+  /* Initialize the base context.  */
+  pfile->context = &pfile->base_context;
+  pfile->base_context.macro = 0;
+  pfile->base_context.prev = pfile->base_context.next = 0;
+
+  /* Aligned and unaligned storage.  */
+  pfile->a_buff = _cpp_get_buff (pfile, 0);
+  pfile->u_buff = _cpp_get_buff (pfile, 0);
+
+  /* Initialize table for push_macro/pop_macro.  */
+  pfile->pushed_macros = 0;
+
+  /* The expression parser stack.  */
+  _cpp_expand_op_stack (pfile);
+
+  /* Initialize the buffer obstack.  */
+  _obstack_begin (&pfile->buffer_ob, 0, 0,
+		  (void *(*) (long)) xmalloc,
+		  (void (*) (void *)) free);
+
+  _cpp_init_files (pfile);
+
+  _cpp_init_hashtable (pfile, table);
+
+  return pfile;
+}
+
+/* Set the line_table entry in PFILE.  This is called after reading a
+   PCH file, as the old line_table will be incorrect.  */
+void
+cpp_set_line_map (cpp_reader *pfile, struct line_maps *line_table)
+{
+  pfile->line_table = line_table;
+}
+
+/* Free resources used by PFILE.  Accessing PFILE after this function
+   returns leads to undefined behavior.  Returns the error count.  */
+void
+cpp_destroy (cpp_reader *pfile)
+{
+  cpp_context *context, *contextn;
+  struct def_pragma_macro *pmacro;
+  tokenrun *run, *runn;
+  int i;
+
+  free (pfile->op_stack);
+
+  while (CPP_BUFFER (pfile) != NULL)
+    _cpp_pop_buffer (pfile);
+
+  if (pfile->out.base)
+    free (pfile->out.base);
+
+  if (pfile->macro_buffer)
+    {
+      free (pfile->macro_buffer);
+      pfile->macro_buffer = NULL;
+      pfile->macro_buffer_len = 0;
+    }
+
+  if (pfile->deps)
+    deps_free (pfile->deps);
+  obstack_free (&pfile->buffer_ob, 0);
+
+  _cpp_destroy_hashtable (pfile);
+  _cpp_cleanup_files (pfile);
+  _cpp_destroy_iconv (pfile);
+
+  _cpp_free_buff (pfile->a_buff);
+  _cpp_free_buff (pfile->u_buff);
+  _cpp_free_buff (pfile->free_buffs);
+
+  for (run = &pfile->base_run; run; run = runn)
+    {
+      runn = run->next;
+      free (run->base);
+      if (run != &pfile->base_run)
+	free (run);
+    }
+
+  for (context = pfile->base_context.next; context; context = contextn)
+    {
+      contextn = context->next;
+      free (context);
+    }
+
+  if (pfile->comments.entries)
+    {
+      for (i = 0; i < pfile->comments.count; i++)
+	free (pfile->comments.entries[i].comment);
+
+      free (pfile->comments.entries);
+    }
+  if (pfile->pushed_macros)
+    {
+      do
+	{
+	  pmacro = pfile->pushed_macros;
+	  pfile->pushed_macros = pmacro->next;
+	  free (pmacro->name);
+	  free (pmacro);
+	}
+      while (pfile->pushed_macros);
+    }
+
+  free (pfile);
+}
+
+/* This structure defines one built-in identifier.  A node will be
+   entered in the hash table under the name NAME, with value VALUE.
+
+   There are two tables of these.  builtin_array holds all the
+   "builtin" macros: these are handled by builtin_macro() in
+   macro.c.  Builtin is somewhat of a misnomer -- the property of
+   interest is that these macros require special code to compute their
+   expansions.  The value is a "builtin_type" enumerator.
+
+   operator_array holds the C++ named operators.  These are keywords
+   which act as aliases for punctuators.  In C++, they cannot be
+   altered through #define, and #if recognizes them as operators.  In
+   C, these are not entered into the hash table at all (but see
+   <iso646.h>).  The value is a token-type enumerator.  */
+struct builtin_macro
+{
+  const uchar *const name;
+  const unsigned short len;
+  const unsigned short value;
+  const bool always_warn_if_redefined;
+};
+
+#define B(n, t, f)    { DSC(n), t, f }
+static const struct builtin_macro builtin_array[] =
+{
+  B("__TIMESTAMP__",	 BT_TIMESTAMP,     false),
+  B("__TIME__",		 BT_TIME,          false),
+  B("__DATE__",		 BT_DATE,          false),
+  B("__FILE__",		 BT_FILE,          false),
+  B("__BASE_FILE__",	 BT_BASE_FILE,     false),
+  B("__LINE__",		 BT_SPECLINE,      true),
+  B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true),
+  B("__COUNTER__",	 BT_COUNTER,       true),
+  /* Keep builtins not used for -traditional-cpp at the end, and
+     update init_builtins() if any more are added.  */
+  B("_Pragma",		 BT_PRAGMA,        true),
+  B("__STDC__",		 BT_STDC,          true),
+};
+#undef B
+
+struct builtin_operator
+{
+  const uchar *const name;
+  const unsigned short len;
+  const unsigned short value;
+};
+
+#define B(n, t)    { DSC(n), t }
+static const struct builtin_operator operator_array[] =
+{
+  B("and",	CPP_AND_AND),
+  B("and_eq",	CPP_AND_EQ),
+  B("bitand",	CPP_AND),
+  B("bitor",	CPP_OR),
+  B("compl",	CPP_COMPL),
+  B("not",	CPP_NOT),
+  B("not_eq",	CPP_NOT_EQ),
+  B("or",	CPP_OR_OR),
+  B("or_eq",	CPP_OR_EQ),
+  B("xor",	CPP_XOR),
+  B("xor_eq",	CPP_XOR_EQ)
+};
+#undef B
+
+/* Mark the C++ named operators in the hash table.  */
+static void
+mark_named_operators (cpp_reader *pfile)
+{
+  const struct builtin_operator *b;
+
+  for (b = operator_array;
+       b < (operator_array + ARRAY_SIZE (operator_array));
+       b++)
+    {
+      cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
+      hp->flags |= NODE_OPERATOR;
+      hp->is_directive = 0;
+      hp->directive_index = b->value;
+    }
+}
+
+void
+cpp_init_special_builtins (cpp_reader *pfile)
+{
+  const struct builtin_macro *b;
+  size_t n = ARRAY_SIZE (builtin_array);
+
+  if (CPP_OPTION (pfile, traditional))
+    n -= 2;
+  else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
+	   || CPP_OPTION (pfile, std))
+    n--;
+
+  for (b = builtin_array; b < builtin_array + n; b++)
+    {
+      cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
+      hp->type = NT_MACRO;
+      hp->flags |= NODE_BUILTIN;
+      if (b->always_warn_if_redefined
+          || CPP_OPTION (pfile, warn_builtin_macro_redefined))
+	hp->flags |= NODE_WARN;
+      hp->value.builtin = (enum builtin_type) b->value;
+    }
+}
+
+/* Read the builtins table above and enter them, and language-specific
+   macros, into the hash table.  HOSTED is true if this is a hosted
+   environment.  */
+void
+cpp_init_builtins (cpp_reader *pfile, int hosted)
+{
+  cpp_init_special_builtins (pfile);
+
+  if (!CPP_OPTION (pfile, traditional)
+      && (! CPP_OPTION (pfile, stdc_0_in_system_headers)
+	  || CPP_OPTION (pfile, std)))
+    _cpp_define_builtin (pfile, "__STDC__ 1");
+
+  if (CPP_OPTION (pfile, cplusplus))
+    _cpp_define_builtin (pfile, "__cplusplus 1");
+  else if (CPP_OPTION (pfile, lang) == CLK_ASM)
+    _cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
+  else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
+    _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
+  else if (CPP_OPTION (pfile, c99))
+    _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
+
+  if (hosted)
+    _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
+  else
+    _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
+
+  if (CPP_OPTION (pfile, objc))
+    _cpp_define_builtin (pfile, "__OBJC__ 1");
+}
+
+/* Sanity-checks are dependent on command-line options, so it is
+   called as a subroutine of cpp_read_main_file ().  */
+#if ENABLE_CHECKING
+static void sanity_checks (cpp_reader *);
+static void sanity_checks (cpp_reader *pfile)
+{
+  cppchar_t test = 0;
+  size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
+
+  /* Sanity checks for assumptions about CPP arithmetic and target
+     type precisions made by cpplib.  */
+  test--;
+  if (test < 1)
+    cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
+
+  if (CPP_OPTION (pfile, precision) > max_precision)
+    cpp_error (pfile, CPP_DL_ICE,
+	       "preprocessor arithmetic has maximum precision of %lu bits;"
+	       " target requires %lu bits",
+	       (unsigned long) max_precision,
+	       (unsigned long) CPP_OPTION (pfile, precision));
+
+  if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
+    cpp_error (pfile, CPP_DL_ICE,
+	       "CPP arithmetic must be at least as precise as a target int");
+
+  if (CPP_OPTION (pfile, char_precision) < 8)
+    cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
+
+  if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
+    cpp_error (pfile, CPP_DL_ICE,
+	       "target wchar_t is narrower than target char");
+
+  if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
+    cpp_error (pfile, CPP_DL_ICE,
+	       "target int is narrower than target char");
+
+  /* This is assumed in eval_token() and could be fixed if necessary.  */
+  if (sizeof (cppchar_t) > sizeof (cpp_num_part))
+    cpp_error (pfile, CPP_DL_ICE,
+	       "CPP half-integer narrower than CPP character");
+
+  if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
+    cpp_error (pfile, CPP_DL_ICE,
+	       "CPP on this host cannot handle wide character constants over"
+	       " %lu bits, but the target requires %lu bits",
+	       (unsigned long) BITS_PER_CPPCHAR_T,
+	       (unsigned long) CPP_OPTION (pfile, wchar_precision));
+}
+#else
+# define sanity_checks(PFILE)
+#endif
+
+/* This is called after options have been parsed, and partially
+   processed.  */
+void
+cpp_post_options (cpp_reader *pfile)
+{
+  sanity_checks (pfile);
+
+  post_options (pfile);
+
+  /* Mark named operators before handling command line macros.  */
+  if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
+    mark_named_operators (pfile);
+}
+
+/* Setup for processing input from the file named FNAME, or stdin if
+   it is the empty string.  Return the original filename
+   on success (e.g. foo.i->foo.c), or NULL on failure.  */
+const char *
+cpp_read_main_file (cpp_reader *pfile, const char *fname)
+{
+  if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
+    {
+      if (!pfile->deps)
+	pfile->deps = deps_init ();
+
+      /* Set the default target (if there is none already).  */
+      deps_add_default_target (pfile->deps, fname);
+    }
+
+  pfile->main_file
+    = _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0);
+  if (_cpp_find_failed (pfile->main_file))
+    return NULL;
+
+  _cpp_stack_file (pfile, pfile->main_file, false);
+
+  /* For foo.i, read the original filename foo.c now, for the benefit
+     of the front ends.  */
+  if (CPP_OPTION (pfile, preprocessed))
+    {
+      read_original_filename (pfile);
+      fname = pfile->line_table->maps[pfile->line_table->used-1].to_file;
+    }
+  return fname;
+}
+
+/* For preprocessed files, if the first tokens are of the form # NUM.
+   handle the directive so we know the original file name.  This will
+   generate file_change callbacks, which the front ends must handle
+   appropriately given their state of initialization.  */
+static void
+read_original_filename (cpp_reader *pfile)
+{
+  const cpp_token *token, *token1;
+
+  /* Lex ahead; if the first tokens are of the form # NUM, then
+     process the directive, otherwise back up.  */
+  token = _cpp_lex_direct (pfile);
+  if (token->type == CPP_HASH)
+    {
+      pfile->state.in_directive = 1;
+      token1 = _cpp_lex_direct (pfile);
+      _cpp_backup_tokens (pfile, 1);
+      pfile->state.in_directive = 0;
+
+      /* If it's a #line directive, handle it.  */
+      if (token1->type == CPP_NUMBER)
+	{
+	  _cpp_handle_directive (pfile, token->flags & PREV_WHITE);
+	  read_original_directory (pfile);
+	  return;
+	}
+    }
+
+  /* Backup as if nothing happened.  */
+  _cpp_backup_tokens (pfile, 1);
+}
+
+/* For preprocessed files, if the tokens following the first filename
+   line is of the form # <line> "/path/name//", handle the
+   directive so we know the original current directory.  */
+static void
+read_original_directory (cpp_reader *pfile)
+{
+  const cpp_token *hash, *token;
+
+  /* Lex ahead; if the first tokens are of the form # NUM, then
+     process the directive, otherwise back up.  */
+  hash = _cpp_lex_direct (pfile);
+  if (hash->type != CPP_HASH)
+    {
+      _cpp_backup_tokens (pfile, 1);
+      return;
+    }
+
+  token = _cpp_lex_direct (pfile);
+
+  if (token->type != CPP_NUMBER)
+    {
+      _cpp_backup_tokens (pfile, 2);
+      return;
+    }
+
+  token = _cpp_lex_direct (pfile);
+
+  if (token->type != CPP_STRING
+      || ! (token->val.str.len >= 5
+	    && token->val.str.text[token->val.str.len-2] == '/'
+	    && token->val.str.text[token->val.str.len-3] == '/'))
+    {
+      _cpp_backup_tokens (pfile, 3);
+      return;
+    }
+
+  if (pfile->cb.dir_change)
+    {
+      char *debugdir = (char *) alloca (token->val.str.len - 3);
+
+      memcpy (debugdir, (const char *) token->val.str.text + 1,
+	      token->val.str.len - 4);
+      debugdir[token->val.str.len - 4] = '\0';
+
+      pfile->cb.dir_change (pfile, debugdir);
+    }      
+}
+
+/* This is called at the end of preprocessing.  It pops the last
+   buffer and writes dependency output, and returns the number of
+   errors.
+
+   Maybe it should also reset state, such that you could call
+   cpp_start_read with a new filename to restart processing.  */
+int
+cpp_finish (cpp_reader *pfile, FILE *deps_stream)
+{
+  /* Warn about unused macros before popping the final buffer.  */
+  if (CPP_OPTION (pfile, warn_unused_macros))
+    cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
+
+  /* lex.c leaves the final buffer on the stack.  This it so that
+     it returns an unending stream of CPP_EOFs to the client.  If we
+     popped the buffer, we'd dereference a NULL buffer pointer and
+     segfault.  It's nice to allow the client to do worry-free excess
+     cpp_get_token calls.  */
+  while (pfile->buffer)
+    _cpp_pop_buffer (pfile);
+
+  /* Don't write the deps file if there are errors.  */
+  if (CPP_OPTION (pfile, deps.style) != DEPS_NONE
+      && deps_stream && pfile->errors == 0)
+    {
+      deps_write (pfile->deps, deps_stream, 72);
+
+      if (CPP_OPTION (pfile, deps.phony_targets))
+	deps_phony_targets (pfile->deps, deps_stream);
+    }
+
+  /* Report on headers that could use multiple include guards.  */
+  if (CPP_OPTION (pfile, print_include_names))
+    _cpp_report_missing_guards (pfile);
+
+  return pfile->errors;
+}
+
+static void
+post_options (cpp_reader *pfile)
+{
+  /* -Wtraditional is not useful in C++ mode.  */
+  if (CPP_OPTION (pfile, cplusplus))
+    CPP_OPTION (pfile, warn_traditional) = 0;
+
+  /* Permanently disable macro expansion if we are rescanning
+     preprocessed text.  Read preprocesed source in ISO mode.  */
+  if (CPP_OPTION (pfile, preprocessed))
+    {
+      if (!CPP_OPTION (pfile, directives_only))
+	pfile->state.prevent_expansion = 1;
+      CPP_OPTION (pfile, traditional) = 0;
+    }
+
+  if (CPP_OPTION (pfile, warn_trigraphs) == 2)
+    CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
+
+  if (CPP_OPTION (pfile, traditional))
+    {
+      CPP_OPTION (pfile, cplusplus_comments) = 0;
+
+      /* Traditional CPP does not accurately track column information.  */
+      CPP_OPTION (pfile, show_column) = 0;
+      CPP_OPTION (pfile, trigraphs) = 0;
+      CPP_OPTION (pfile, warn_trigraphs) = 0;
+    }
+}