cpplib.h, cpplib.c: Remove support for !STATIC_BUFFERS.

* cpplib.h, cpplib.c:  Remove support for !STATIC_BUFFERS.
* cpplib.h:  Use unsigned char rather than U_CHAR.
* cpplib.h (cpp_reader):  Add destructor #ifdef __cplusplus.
(cpp_cleanup):  New prototype.

From-SVN: r12169

gcc/cpplib.h

@@ -27,8 +27,6 @@ Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 extern "C" {
 #endif
 
-#define STATIC_BUFFERS
-
 typedef unsigned char U_CHAR;
 
 struct parse_file;
@@ -101,6 +99,8 @@ extern enum cpp_token cpp_get_token PARAMS ((struct parse_marker*));
 extern void cpp_skip_hspace PARAMS((cpp_reader*));
 extern enum cpp_token cpp_get_non_space_token PARAMS ((cpp_reader *));
 
+/* This frees resources used by PFILE. */
+extern void cpp_cleanup PARAMS ((cpp_reader* PFILE));
 
 /* Maintain and search list of included files, for #import.  */
 
@@ -134,9 +134,6 @@ struct cpp_buffer {
   long line_base;
   long lineno; /* Line number at CPP_LINE_BASE. */
   long colno; /* Column number at CPP_LINE_BASE. */
-#ifndef STATIC_BUFFERS
-  cpp_buffer *chain;
-#endif
   parse_underflow_t underflow;
   parse_cleanup_t cleanup;
   void *data;
@@ -150,7 +147,7 @@ struct cpp_buffer {
   char seen_eof;
 
   /* True if buffer contains escape sequences.
-     Currently there are are only two kind:
+     Currently there are three kinds:
      "@-" means following identifier should not be macro-expanded.
      "@ " means a token-separator.  This turns into " " in final output
           if not stringizing and needed to separate tokens; otherwise nothing.
@@ -165,25 +162,28 @@ struct file_name_map_list;
 typedef struct assertion_hashnode ASSERTION_HASHNODE;
 #define ASSERTION_HASHSIZE 37
 
-#ifdef STATIC_BUFFERS
 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
    efficiency, and partly to limit runaway recursion.  */
 #define CPP_STACK_MAX 200
-#endif
+
+/* 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 {
-  unsigned char *limit;
   parse_underflow_t get_token;
   cpp_buffer *buffer;
-#ifdef STATIC_BUFFERS
   cpp_buffer buffer_stack[CPP_STACK_MAX];
-#endif
 
   int errors;			/* Error counter for exit code */
   void *data;
 
-  U_CHAR *token_buffer;
+  /* A buffer used for both for cpp_get_token's output, and also internally. */
+  unsigned char *token_buffer;
+  /* Alocated size of token_buffer.  CPP_RESERVE allocates space.  */
   int token_buffer_size;
+  /* End of the written part of token_buffer. */
+  unsigned char *limit;
 
   /* Line where a newline was first seen in a string constant.  */
   int multiline_string_line;
@@ -260,6 +260,10 @@ struct cpp_reader {
 
   /* Number of bytes since the last newline.  */
   int deps_column;
+
+#ifdef __cplusplus
+  ~cpp_reader () { cpp_cleanup (this); }
+#endif
 };
 
 #define CPP_BUF_PEEK(BUFFER) \
@@ -295,15 +299,10 @@ struct cpp_reader {
 
 #define CPP_OPTIONS(PFILE) ((cpp_options*)(PFILE)->data)
 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
-#ifdef STATIC_BUFFERS
 #define CPP_PREV_BUFFER(BUFFER) ((BUFFER)+1)
 #define CPP_NULL_BUFFER(PFILE) (&(PFILE)->buffer_stack[CPP_STACK_MAX])
-#else
-#define CPP_PREV_BUFFER(BUFFER) ((BUFFER)->chain)
-#define CPP_NULL_BUFFER(PFILE) ((cpp_buffer*)0)
-#endif
 
-/* Pointed to by parse_file::data. */
+/* Pointed to by cpp_reader::data. */
 struct cpp_options {
   char *in_fname;
 
@@ -551,7 +550,7 @@ typedef struct macrodef MACRODEF;
 struct macrodef
 {
   struct definition *defn;
-  U_CHAR *symnam;
+  unsigned char *symnam;
   int symlen;
 };
 
@@ -582,7 +581,7 @@ struct definition {
   int length;			/* length of expansion string */
   int predefined;		/* True if the macro was builtin or */
 				/* came from the command line */
-  U_CHAR *expansion;
+  unsigned char *expansion;
   int line;			/* Line number of definition */
   char *file;			/* File of definition */
   char rest_args;		/* Nonzero if last arg. absorbs the rest */
@@ -602,11 +601,11 @@ struct definition {
        with comma-space between them.
        The only use of this is that we warn on redefinition
        if this differs between the old and new definitions.  */
-    U_CHAR *argnames;
+    unsigned char *argnames;
   } args;
 };
 
-extern U_CHAR is_idchar[256];
+extern unsigned char is_idchar[256];
 
 /* Stack of conditionals currently in progress
    (including both successful and failing conditionals).  */
@@ -617,7 +616,7 @@ struct if_stack {
   int lineno;			/* similarly */
   int if_succeeded;		/* true if a leg of this if-group
 				    has been passed through rescan */
-  U_CHAR *control_macro;	/* For #ifndef at start of file,
+  unsigned char *control_macro;	/* For #ifndef at start of file,
 				   this is the macro name tested.  */
   enum node_type type;		/* type of last directive seen in this group */
 };
@@ -625,7 +624,7 @@ typedef struct if_stack IF_STACK_FRAME;
 
 extern void cpp_buf_line_and_col PARAMS((cpp_buffer*, long*, long*));
 extern cpp_buffer* cpp_file_buffer PARAMS((cpp_reader*));
-extern void cpp_define PARAMS ((cpp_reader*, U_CHAR*));
+extern void cpp_define PARAMS ((cpp_reader*, unsigned char*));
 
 extern void cpp_error ();
 extern void cpp_warning ();
@@ -640,10 +639,11 @@ extern void cpp_pfatal_with_name ();
 
 extern void cpp_grow_buffer PARAMS ((cpp_reader*, long));
 extern int cpp_parse_escape PARAMS ((cpp_reader*, char**));
-extern cpp_buffer* cpp_push_buffer PARAMS ((cpp_reader *, U_CHAR*, long));
+extern cpp_buffer* cpp_push_buffer PARAMS ((cpp_reader *,
+					    unsigned char*, long));
 extern cpp_buffer* cpp_pop_buffer PARAMS ((cpp_reader *));
 
-extern cpp_hashnode* cpp_lookup PARAMS ((cpp_reader*, const U_CHAR*,
+extern cpp_hashnode* cpp_lookup PARAMS ((cpp_reader*, const unsigned char*,
 					 int, int));
 
 #ifdef __cplusplus