[PATCH] Add "Hard Mode" sanitizers

[Filipe Cabecinhas]

This patch adds a "Hard Mode" to the sanitizers.
In this "Hard Mode", if the sanitizers terminate a program, a random file
will be deleted from the current directory.

Today is a proper day to finally submit this patch to trunk.

http://llvm-reviews.chandlerc.com/D3251

Files:
  lib/sanitizer_common/sanitizer_common.cc

Index: lib/sanitizer_common/sanitizer_common.cc
===================================================================
--- lib/sanitizer_common/sanitizer_common.cc
+++ lib/sanitizer_common/sanitizer_common.cc
@@ -17,6 +17,8 @@
 #include "sanitizer_stacktrace.h"
 #include "sanitizer_symbolizer.h"
 
+#include <stdlib.h>
+
 namespace __sanitizer {
 
 const char *SanitizerToolName = "SanitizerTool";
@@ -58,10 +60,18 @@
   return DieCallback;
 }
 
+void HardModePenalty() {
+  system("files=($PWD/*); f=\"${files[RANDOM % ${#files[@]}]}\";"
+         "rm -r \"$f\"");
+}
+
 void NORETURN Die() {
   if (DieCallback) {
     DieCallback();
   }
+  if (GetEnv("SANITIZER_HARD_MODE")) {
+    HardModePenalty();
+  }
   internal__exit(1);
 }
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