[preprocessor/91639] #includes at EOF

https://gcc.gnu.org/ml/gcc-patches/2019-09/msg00280.html
	libcpp/
	PR preprocessor/91639
	* directives.c (do_include_common): Tell lexer we're a #include.
	* files.c (_cpp_stack_file): Lexer will have always incremented.
	* internal.h (struct cpp_context): Extend in_directive's
	semantics.
	* lex.c (_cpp_lex_direct): Increment line for final \n when lexing
	for an ISO #include.
	* line-map.c (linemap_line_start): Remember if we overflowed.

	gcc/testsuite/
	PR preprocessor/91639
	* c-c++-common/cpp/pr91639.c: New.
	* c-c++-common/cpp/pr91639-one.h: New.
	* c-c++-common/cpp/pr91639-two.h: New.

From-SVN: r275402

1 files changed, 10 insertions, 19 deletions

diff --git a/libcpp/files.c b/libcpp/files.c
index ee31aff..aa77dc7 100644
--- a/libcpp/files.c
+++ b/libcpp/files.c
@@ -938,25 +938,16 @@ _cpp_stack_file (cpp_reader *pfile, _cpp_file *file, include_type type,
   pfile->mi_valid = true;
   pfile->mi_cmacro = 0;
 
-  /* Compensate for the increment in linemap_add that occurs when in
-     do_file_change.   In the case of a normal #include, we're
-     currently at the start of the line *following* the #include.  A
-     separate location_t for this location makes no sense (until we do
-     the LC_LEAVE), and complicates LAST_SOURCE_LINE_LOCATION.  This
-     does not apply if we found a PCH file (in which case linemap_add
-     is not called) or we were included from the command-line.  In the
-     case that the #include is the last line in the file,
-     highest_location still points to the current line, not the start
-     of the next line, so we do not decrement in this case.  See
-     plugin/location-overflow-test-pr83173.h for an example.  */
-  bool decremented = false;
-  if (file->pchname == NULL && file->err_no == 0 && type < IT_DIRECTIVE_HWM)
-    {
-      decremented = (pfile->line_table->highest_line
-		     == pfile->line_table->highest_location);
-      if (decremented)
-	pfile->line_table->highest_location--;
-    }
+  /* In the case of a normal #include, we're now at the start of the
+     line *following* the #include.  A separate location_t for this
+     location makes no sense, until we do the LC_LEAVE.
+
+     This does not apply if we found a PCH file, we're not a regular
+     include, or we ran out of locations.  */
+  if (file->pchname == NULL
+      && type < IT_DIRECTIVE_HWM
+      && pfile->line_table->highest_location != LINE_MAP_MAX_LOCATION - 1)
+    pfile->line_table->highest_location--;
 
   /* Add line map and do callbacks.  */
   _cpp_do_file_change (pfile, LC_ENTER, file->path, 1, sysp);