[PATCH] Sanitizer: Add support for default blacklist locations in resource directory.

[Alexey Samsonov]

Hi chandlerc, rsmith,

If -fsanitize-blacklist= option is not explicitly specified,
Clang will look for the default blacklist for a given sanitizer in the
resource directory. Blacklists would be optionally created and installed
by compiler-rt build system.

http://llvm-reviews.chandlerc.com/D378

Files:
  lib/Driver/SanitizerArgs.h
  lib/Driver/Tools.cpp

Index: lib/Driver/SanitizerArgs.h
===================================================================
--- lib/Driver/SanitizerArgs.h
+++ lib/Driver/SanitizerArgs.h
@@ -15,6 +15,7 @@
 #include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Driver/Options.h"
 #include "llvm/ADT/StringSwitch.h"
+#include "llvm/Support/Path.h"
 
 namespace clang {
 namespace driver {
@@ -189,6 +190,18 @@
 
     llvm_unreachable("arg didn't provide expected value");
   }
+
+  static bool getDefaultBlacklistForKind(const Driver &D, unsigned Kind,
+                                         std::string &BLPath) {
+    // For now, specify the default blacklist location for ASan only.
+    if (Kind & NeedsAsanRt) {
+      SmallString<64> Path(D.ResourceDir);
+      llvm::sys::path::append(Path, "asan_blacklist.txt");
+      BLPath = Path.str();
+      return true;
+    }
+    return false;
+  }
 };
 
 }  // namespace driver
Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp
+++ lib/Driver/Tools.cpp
@@ -1548,6 +1548,14 @@
       else
         D.Diag(diag::err_drv_no_such_file) << BLPath;
     }
+  } else {
+    // If no -fsanitize-blacklist option is specified, try to look up for
+    // blacklist in the resource directory.
+    std::string BLPath;
+    bool BLExists = false;
+    if (getDefaultBlacklistForKind(D, Kind, BLPath) &&
+        !llvm::sys::fs::exists(BLPath, BLExists) && BLExists)
+      BlacklistFile = BLPath;
   }
 
   // Parse -f(no-)sanitize-memory-track-origins options.
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