Make ASAN/MSAN ignore Dart frames.

runtime/vm/profiler.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/address_sanitizer.h"
 #include "platform/memory_sanitizer.h"
 #include "platform/utils.h"
 
 #include "vm/allocation.h"
 #include "vm/atomic.h"
@@ skipping 390 matching lines @@
       return false;
     }
     // Success, update fp and pc.
     fp_ = new_fp;
     pc_ = CallerPC();
     return true;
   }
 
   uword InitialReturnAddress() const {
     ASSERT(sp_ != NULL);
+    // MSan/ASan are unaware of frames initialized by generated code.
+    MSAN_UNPOISON(sp_, kWordSize);
+    ASAN_UNPOISON(sp_, kWordSize);
     return *(sp_);
   }
 
   uword* CallerPC() const {
     ASSERT(fp_ != NULL);
-    return reinterpret_cast<uword*>(*(fp_ + kSavedCallerPcSlotFromFp));
+    uword* caller_pc_ptr = fp_ + kSavedCallerPcSlotFromFp;
+    // MSan/ASan are unaware of frames initialized by generated code.
+    MSAN_UNPOISON(caller_pc_ptr, kWordSize);
+    ASAN_UNPOISON(caller_pc_ptr, kWordSize);
+    return reinterpret_cast<uword*>(*caller_pc_ptr);
   }
 
   uword* CallerFP() const {
     ASSERT(fp_ != NULL);
-    return reinterpret_cast<uword*>(*(fp_ + kSavedCallerFpSlotFromFp));
+    uword* caller_fp_ptr = fp_ + kSavedCallerFpSlotFromFp;
+    // MSan/ASan are unaware of frames initialized by generated code.
+    MSAN_UNPOISON(caller_fp_ptr, kWordSize);
+    ASAN_UNPOISON(caller_fp_ptr, kWordSize);
+    return reinterpret_cast<uword*>(*caller_fp_ptr);
   }
 
   uword* ExitLink() const {
     ASSERT(fp_ != NULL);
-    return reinterpret_cast<uword*>(*(fp_ + kExitLinkSlotFromEntryFp));
+    uword* exit_link_ptr = fp_ + kExitLinkSlotFromEntryFp;
+    // MSan/ASan are unaware of frames initialized by generated code.
+    MSAN_UNPOISON(exit_link_ptr, kWordSize);
+    ASAN_UNPOISON(exit_link_ptr, kWordSize);
+    return reinterpret_cast<uword*>(*exit_link_ptr);
   }
 
   bool ValidFramePointer() const {
     return ValidFramePointer(fp_);
   }
 
   bool ValidFramePointer(uword* fp) const {
     if (fp == NULL) {
       return false;
     }
@@ skipping 277 matching lines @@
                                             state.pc,
                                             state.fp,
                                             sp);
       stackWalker.walk();
 #endif
     }
   }
 }
 
 }  // namespace dart