[PR 95182] ICE with EOF in macro args

[PR 95182] ICE with EOF in macro args

[Nathan Sidwell]

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This was another latent case of us losing an EOF token, but succeeding 
anyway.  Since my patch to make us pay more attention to EOFs it came to 
light.  We also need to keep the EOF if we fall off the end of the main 
file.  Forced includes look like regular nested includes at this point.

pushed to trunk

nathan
-- 
Nathan Sidwell

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2020-05-18  Nathan Sidwell  <nathan@acm.org>

	PR preprocessor/95182
	libcpp/
	* macro.c (collect_args): Preserve EOFif we fell out of the main
	file.
	(cpp_get_token_1): Reformat a couple of short lines.

diff --git c/libcpp/macro.c w/libcpp/macro.c
index dc4366ffefd..2c7d7322e09 100644
--- c/libcpp/macro.c
+++ w/libcpp/macro.c
@@ -1258,11 +1258,13 @@ collect_args (cpp_reader *pfile, const cpp_hashnode *node,
 
   if (token->type == CPP_EOF)
     {
-      /* We still need the CPP_EOF to end directives, and to end
-	 pre-expansion of a macro argument.  Step back is not
-	 unconditional, since we don't want to return a CPP_EOF to our
-	 callers at the end of an -include-d file.  */
-      if (pfile->context->prev || pfile->state.in_directive)
+      /* We still need the CPP_EOF to end directives, to end
+	 pre-expansion of a macro argument, and at the end of the main
+	 file.  We do not want it at the end of a -include'd (forced)
+	 header file.  */
+      if (pfile->state.in_directive
+	  || !pfile->line_table->depth
+	  || pfile->context->prev)
 	_cpp_backup_tokens (pfile, 1);
       cpp_error (pfile, CPP_DL_ERROR,
 		 "unterminated argument list invoking macro \"%s\"",
@@ -2870,8 +2872,7 @@ cpp_get_token_1 (cpp_reader *pfile, location_t *location)
 				      || (peek_tok->flags & PREV_WHITE));
 		  node = pfile->cb.macro_to_expand (pfile, result);
 		  if (node)
-		    ret = enter_macro_context (pfile, node, result,
-					       virt_loc);
+		    ret = enter_macro_context (pfile, node, result, virt_loc);
 		  else if (whitespace_after)
 		    {
 		      /* If macro_to_expand hook returned NULL and it
@@ -2888,8 +2889,7 @@ cpp_get_token_1 (cpp_reader *pfile, location_t *location)
 		}
 	    }
 	  else
-	    ret = enter_macro_context (pfile, node, result, 
-				       virt_loc);
+	    ret = enter_macro_context (pfile, node, result, virt_loc);
 	  if (ret)
  	    {
 	      if (pfile->state.in_directive || ret == 2)
diff --git c/gcc/testsuite/c-c++-common/cpp/eof-1.c w/gcc/testsuite/c-c++-common/cpp/eof-1.c
new file mode 100644
index 00000000000..0a06f091d93
--- /dev/null
+++ w/gcc/testsuite/c-c++-common/cpp/eof-1.c
@@ -0,0 +1,7 @@
+/* PR preprocess/95183  */
+
+/* { dg-do preprocess } */
+
+#define f(x) x
+
+f( /* { dg-error "-:unterminated" "unterminated macro" } */
diff --git c/gcc/testsuite/c-c++-common/cpp/eof-2.c w/gcc/testsuite/c-c++-common/cpp/eof-2.c
new file mode 100644
index 00000000000..3a4af7f6850
--- /dev/null
+++ w/gcc/testsuite/c-c++-common/cpp/eof-2.c
@@ -0,0 +1,8 @@
+/* PR preprocess/95183  */
+
+/* { dg-do preprocess } */
+
+#define f(x) x
+
+#include "eof-2.h"
+ /* { dg-regexp {[^\n]*eof-2.h:4: error: unterminated argument list invoking macro "f"\n} } */
diff --git c/gcc/testsuite/c-c++-common/cpp/eof-2.h w/gcc/testsuite/c-c++-common/cpp/eof-2.h
new file mode 100644
index 00000000000..48ad85791db
--- /dev/null
+++ w/gcc/testsuite/c-c++-common/cpp/eof-2.h
@@ -0,0 +1,4 @@
+
+#define f(x) x
+
+f( /* Error here  */
diff --git c/gcc/testsuite/c-c++-common/cpp/eof-3.c w/gcc/testsuite/c-c++-common/cpp/eof-3.c
new file mode 100644
index 00000000000..316918e3a6c
--- /dev/null
+++ w/gcc/testsuite/c-c++-common/cpp/eof-3.c
@@ -0,0 +1,8 @@
+/* PR preprocess/95183  */
+
+/* { dg-do preprocess } */
+/* { dg-additional-options "-include $srcdir/c-c++-common/cpp/eof-2.h" } */
+
+ /* { dg-regexp {[^\n]*eof-2.h:4: error: unterminated argument list invoking macro "f"\n} } */
+
+token )