re PR middle-end/53510 (OOM while compile some code)

	PR middle-end/53510
	* input.c (read_line): Use XRESIZEVEC instead of XNEWVEC
	to avoid leaking memory.  No need to handle memory allocation
	failure.  Double string_len on each reallocation instead of
	adding 2.
	* gcov.c (read_line): Likewise.

From-SVN: r187952

gcc/ChangeLog

+2012-05-29  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/53510
+	* input.c (read_line): Use XRESIZEVEC instead of XNEWVEC
+	to avoid leaking memory.  No need to handle memory allocation
+	failure.  Double string_len on each reallocation instead of
+	adding 2.
+	* gcov.c (read_line): Likewise.
+
 2012-05-29  Hans-Peter Nilsson  <hp@axis.com>
 
 	* config/cris/cris.h (TARGET_HAS_BREAK, TARGET_TRAP_USING_BREAK8):

gcc/gcov.c

@@ -2219,15 +2219,8 @@ read_line (FILE *file)
 	  return string;
 	}
       pos += len;
-      ptr = XNEWVEC (char, string_len * 2);
-      if (ptr)
-	{
-	  memcpy (ptr, string, pos);
-	  string = ptr;
-	  string_len += 2;
-	}
-      else
-	pos = 0;
+      string = XRESIZEVEC (char, string, string_len * 2);
+      string_len *= 2;
     }
       
   return pos ? string : NULL;

gcc/input.c

 /* Data and functions related to line maps and input files.
-   Copyright (C) 2004, 2007, 2008, 2009, 2010, 2011
+   Copyright (C) 2004, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -105,15 +105,8 @@ read_line (FILE *file)
 	  return string;
 	}
       pos += len;
-      ptr = XNEWVEC (char, string_len * 2);
-      if (ptr)
-	{
-	  memcpy (ptr, string, pos);
-	  string = ptr;
-	  string_len += 2;
-	}
-      else
-	pos = 0;
+      string = XRESIZEVEC (char, string, string_len * 2);
+      string_len *= 2;
     }
       
   return pos ? string : NULL;