cpphash.h (FIRST, [...]): New.

	* cpphash.h (FIRST, LAST, CUR, RLIMIT): New.
	(struct cpp_context): Add traditional fields.
	* cppmacro.c (paste_all_tokens, push_ptoken_context,
	push_token_context, cpp_get_token, _cpp_backup_tokens): Update.
	* cpptrad.c (skip_comment, lex_identifier,
	_cpp_read_logical_line_trad, scan_out_logical_line): Update.

From-SVN: r54242

4 files changed, 64 insertions, 31 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3f2df69..8a198ec 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2002-06-04  Neil Booth  <neil@daikokuya.demon.co.uk>
+
+	* cpphash.h (FIRST, LAST, CUR, RLIMIT): New.
+	(struct cpp_context): Add traditional fields.
+	* cppmacro.c (paste_all_tokens, push_ptoken_context,
+	push_token_context, cpp_get_token, _cpp_backup_tokens): Update.
+	* cpptrad.c (skip_comment, lex_identifier,
+	_cpp_read_logical_line_trad, scan_out_logical_line): Update.
+
 2002-06-04  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* gbl-ctors.h: Fix formatting.
diff --git a/gcc/cpphash.h b/gcc/cpphash.h
index a059e2b..6d3f1b9 100644
--- a/gcc/cpphash.h
+++ b/gcc/cpphash.h
@@ -126,16 +126,36 @@ struct tokenrun
   cpp_token *base, *limit;
 };
 
+/* Accessor macros for struct cpp_context.  */
+#define FIRST(c) (c->u.iso.first)
+#define LAST(c) (c->u.iso.last)
+#define CUR(c) (c->u.trad.cur)
+#define RLIMIT(c) (c->u.trad.rlimit)
+
 typedef struct cpp_context cpp_context;
 struct cpp_context
 {
   /* Doubly-linked list.  */
   cpp_context *next, *prev;
 
-  /* Contexts other than the base context are contiguous tokens.
-     e.g. macro expansions, expanded argument tokens.  */
-  union utoken first;
-  union utoken last;
+  union
+  {
+    /* For ISO macro expansion.  Contexts other than the base context
+       are contiguous tokens.  e.g. macro expansions, expanded
+       argument tokens.  */
+    struct
+    {
+      union utoken first;
+      union utoken last;
+    } iso;
+
+    /* For traditional macro expansion.  */
+    struct
+    {
+      const uchar *cur;
+      const uchar *rlimit;
+    } trad;
+  } u;
 
   /* If non-NULL, a buffer used for storage related to this context.
      When the context is popped, the buffer is released.  */
diff --git a/gcc/cppmacro.c b/gcc/cppmacro.c
index 28095f2..ae5dfa9 100644
--- a/gcc/cppmacro.c
+++ b/gcc/cppmacro.c
@@ -425,9 +425,9 @@ paste_all_tokens (pfile, lhs)
 	 inserted.  In either case, the constraints to #define
 	 guarantee we have at least one more token.  */
       if (context->direct_p)
-	rhs = context->first.token++;
+	rhs = FIRST (context).token++;
       else
-	rhs = *context->first.ptoken++;
+	rhs = *FIRST (context).ptoken++;
 
       if (rhs->type == CPP_PADDING)
 	abort ();
@@ -896,8 +896,8 @@ push_ptoken_context (pfile, macro, buff, first, count)
   context->direct_p = false;
   context->macro = macro;
   context->buff = buff;
-  context->first.ptoken = first;
-  context->last.ptoken = first + count;
+  FIRST (context).ptoken = first;
+  LAST (context).ptoken = first + count;
 }
 
 /* Push a list of tokens.  */
@@ -913,8 +913,8 @@ push_token_context (pfile, macro, first, count)
   context->direct_p = true;
   context->macro = macro;
   context->buff = NULL;
-  context->first.token = first;
-  context->last.token = first + count;
+  FIRST (context).token = first;
+  LAST (context).token = first + count;
 }
 
 /* Expand an argument ARG before replacing parameters in a
@@ -1004,12 +1004,12 @@ cpp_get_token (pfile)
       /* Context->prev == 0 <=> base context.  */
       if (!context->prev)
 	result = _cpp_lex_token (pfile);
-      else if (context->first.token != context->last.token)
+      else if (FIRST (context).token != LAST (context).token)
 	{
 	  if (context->direct_p)
-	    result = context->first.token++;
+	    result = FIRST (context).token++;
 	  else
-	    result = *context->first.ptoken++;
+	    result = *FIRST (context).ptoken++;
 
 	  if (result->flags & PASTE_LEFT)
 	    {
@@ -1118,9 +1118,9 @@ _cpp_backup_tokens (pfile, count)
       if (count != 1)
 	abort ();
       if (pfile->context->direct_p)
-	pfile->context->first.token--;
+	FIRST (pfile->context).token--;
       else
-	pfile->context->first.ptoken--;
+	FIRST (pfile->context).ptoken--;
     }
 }
 
diff --git a/gcc/cpptrad.c b/gcc/cpptrad.c
index d5c2126..4f4d97c 100644
--- a/gcc/cpptrad.c
+++ b/gcc/cpptrad.c
@@ -23,7 +23,7 @@ Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
 /* Lexing TODO: Handle -C, maybe -CC, and space in escaped newlines.
    Stop cpplex.c from recognizing comments and directives during its
-   lexing pass.  */
+   lexing pass.  Get rid of line_base usage - seems pointless?  */
 
 static const uchar *handle_newline PARAMS ((cpp_reader *, const uchar *));
 static const uchar *skip_escaped_newlines PARAMS ((cpp_reader *,
@@ -90,8 +90,8 @@ skip_comment (pfile, cur)
      const uchar *cur;
 {
   unsigned int from_line = pfile->line;
-  unsigned int c = 0, prevc;
-  const uchar *limit = pfile->buffer->rlimit;
+  unsigned int c = 0, prevc = 0;
+  const uchar *limit = RLIMIT (pfile->context);
 
   while (cur < limit)
     {
@@ -138,7 +138,7 @@ lex_identifier (pfile, cur)
     }
   while (ISIDNUM (*cur));
 
-  pfile->buffer->cur = cur;
+  CUR (pfile->context) = cur;
   len = out - pfile->trad_out_cur;
   pfile->trad_out_cur = out;
   return (cpp_hashnode *) ht_lookup (pfile->hash_table, pfile->trad_out_cur,
@@ -206,8 +206,12 @@ _cpp_read_logical_line_trad (pfile)
 	return false;
     }
 
+  CUR (pfile->context) = buffer->cur;
+  RLIMIT (pfile->context) = buffer->rlimit;
   pfile->trad_out_cur = pfile->trad_out_base;
   scan_out_logical_line (pfile);
+  buffer->cur = CUR (pfile->context);
+
   pfile->trad_line = pfile->line;
   pfile->line = first_line;
   _cpp_overlay_buffer (pfile, pfile->trad_out_base,
@@ -222,12 +226,12 @@ static void
 scan_out_logical_line (pfile)
      cpp_reader *pfile;
 {
-  cpp_buffer *buffer = pfile->buffer;
-  const uchar *cur = buffer->cur;
+  cpp_context *context = pfile->context;
+  const uchar *cur = CUR (context);
   unsigned int c, quote = 0;
   uchar *out;
 
-  check_output_buffer (pfile, buffer->rlimit - cur);
+  check_output_buffer (pfile, RLIMIT (context) - cur);
   out = pfile->trad_out_cur;
 
   for (;;)
@@ -240,20 +244,20 @@ scan_out_logical_line (pfile)
       switch (c)
 	{
 	case '\0':
-	  if (cur - 1 != buffer->rlimit)
+	  if (cur - 1 != RLIMIT (context))
 	    break;
 	  cur--;
-	  if (!buffer->from_stage3)
+	  if (!pfile->buffer->from_stage3)
 	    cpp_error (pfile, DL_PEDWARN, "no newline at end of file");
 	  pfile->line++;
-	  if (0)
-	    {
-	    case '\r': case '\n':
-	      cur = handle_newline (pfile, cur - 1);
-	    }
+	  goto finish_output;
+
+	case '\r': case '\n':
+	  cur = handle_newline (pfile, cur - 1);
+	finish_output:
 	  out[-1] = '\n';
 	  out[0] = '\0';
-	  buffer->cur = cur;
+	  CUR (context) = cur;
 	  pfile->trad_out_cur = out;
 	  return;
 
@@ -306,7 +310,7 @@ scan_out_logical_line (pfile)
 	    pfile->trad_out_cur = --out;
 	    node = lex_identifier (pfile, cur - 1);
 	    out = pfile->trad_out_cur;
-	    cur = buffer->cur;
+	    cur = CUR (context);
 	  }
 	  break;