+/* A cpp_reader encapsulates the "state" of a pre-processor run.
+ Applying cpp_get_token repeatedly yields a stream of pre-processor
+ tokens. Usually, there is only one cpp_reader object active. */
+
+struct cpp_reader
+{
+ /* Top of buffer stack. */
+ cpp_buffer *buffer;
+
+ /* Lexer state. */
+ struct lexer_state state;
+
+ /* Source line tracking. */
+ struct line_maps line_maps;
+ struct line_map *map;
+ unsigned int line;
+
+ /* The position of the last lexed token and last lexed directive. */
+ cpp_lexer_pos lexer_pos;
+ cpp_lexer_pos directive_pos;
+ unsigned int directive_line;
+
+ /* Memory pools. */
+ cpp_pool ident_pool; /* For all identifiers, and permanent
+ numbers and strings. */
+ cpp_pool macro_pool; /* For macro definitions. Permanent. */
+ cpp_pool argument_pool; /* For macro arguments. Temporary. */
+
+ /* Context stack. */
+ struct cpp_context base_context;
+ struct cpp_context *context;
+
+ /* If in_directive, the directive if known. */
+ const struct directive *directive;
+
+ /* Multiple inlcude optimisation. */
+ const cpp_hashnode *mi_cmacro;
+ const cpp_hashnode *mi_ind_cmacro;
+ bool mi_valid;
+
+ /* Token lookahead. */
+ struct cpp_lookahead *la_read; /* Read from this lookahead. */
+ struct cpp_lookahead *la_write; /* Write to this lookahead. */
+ struct cpp_lookahead *la_unused; /* Free store. */
+ struct cpp_lookahead *la_saved; /* Backup when entering directive. */
+
+ /* Error counter for exit code. */
+ unsigned int errors;
+
+ /* Line and column where a newline was first seen in a string
+ constant (multi-line strings). */
+ cpp_lexer_pos mlstring_pos;
+
+ /* Buffer to hold macro definition string. */
+ unsigned char *macro_buffer;
+ unsigned int macro_buffer_len;
+
+ /* Current depth in #include directives that use <...>. */
+ unsigned int system_include_depth;
+
+ /* Current depth of buffer stack. */
+ unsigned int buffer_stack_depth;
+
+ /* Current depth in #include directives. */
+ unsigned int include_depth;
+
+ /* Tree of other included files. See cppfiles.c. */
+ struct splay_tree_s *all_include_files;
+
+ /* Current maximum length of directory names in the search path
+ for include files. (Altered as we get more of them.) */
+ unsigned int max_include_len;
+
+ /* Date and time tokens. Calculated together if either is requested. */
+ cpp_token date;
+ cpp_token time;
+
+ /* Opaque handle to the dependencies of mkdeps.c. Used by -M etc. */
+ struct deps *deps;
+
+ /* Obstack holding all macro hash nodes. This never shrinks.
+ See cpphash.c */
+ struct obstack hash_ob;
+
+ /* Obstack holding buffer and conditional structures. This is a
+ real stack. See cpplib.c. */
+ struct obstack buffer_ob;
+
+ /* Pragma table - dynamic, because a library user can add to the
+ list of recognized pragmas. */
+ struct pragma_entry *pragmas;
+
+ /* Call backs. */
+ struct cpp_callbacks cb;
+
+ /* Identifier hash table. */
+ struct ht *hash_table;
+
+ /* User visible options. */
+ struct cpp_options opts;
+
+ /* Special nodes - identifiers with predefined significance to the
+ preprocessor. */
+ struct spec_nodes spec_nodes;
+
+ /* Whether to print our version number. Done this way so
+ we don't get it twice for -v -version. */
+ unsigned char print_version;
+
+ /* Whether cpplib owns the hashtable. */
+ unsigned char our_hashtable;
+};
+
+/* Character classes. Based on the more primitive macros in safe-ctype.h.