Implement heap poisoning in ART's Optimizing compiler.

- Instrument ARM, ARM64, x86 and x86-64 code generators.
- Note: To turn heap poisoning on in Optimizing, set the
  environment variable `ART_HEAP_POISONING' to "true"
  before compiling ART.

Bug: 12687968
Change-Id: Ib3120b38cf805a8a50207a314b9ccc90c8d93740

1 files changed, 13 insertions, 2 deletions

diff --git a/compiler/utils/arm64/assembler_arm64.h b/compiler/utils/arm64/assembler_arm64.h
index db95537f93..05882a30b0 100644
--- a/compiler/utils/arm64/assembler_arm64.h
+++ b/compiler/utils/arm64/assembler_arm64.h
@@ -10,7 +10,7 @@
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
+ * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
@@ -116,7 +116,7 @@ class Arm64Assembler FINAL : public Assembler {
   void LoadFromThread64(ManagedRegister dest, ThreadOffset<8> src, size_t size) OVERRIDE;
   void LoadRef(ManagedRegister dest, FrameOffset src) OVERRIDE;
   void LoadRef(ManagedRegister dest, ManagedRegister base, MemberOffset offs,
-               bool poison_reference) OVERRIDE;
+               bool unpoison_reference) OVERRIDE;
   void LoadRawPtr(ManagedRegister dest, ManagedRegister base, Offset offs) OVERRIDE;
   void LoadRawPtrFromThread64(ManagedRegister dest, ThreadOffset<8> offs) OVERRIDE;
 
@@ -182,6 +182,17 @@ class Arm64Assembler FINAL : public Assembler {
   // and branch to a ExceptionSlowPath if it is.
   void ExceptionPoll(ManagedRegister scratch, size_t stack_adjust) OVERRIDE;
 
+  //
+  // Heap poisoning.
+  //
+
+  // Poison a heap reference contained in `reg`.
+  void PoisonHeapReference(vixl::Register reg);
+  // Unpoison a heap reference contained in `reg`.
+  void UnpoisonHeapReference(vixl::Register reg);
+  // Unpoison a heap reference contained in `reg` if heap poisoning is enabled.
+  void MaybeUnpoisonHeapReference(vixl::Register reg);
+
  private:
   static vixl::Register reg_x(int code) {
     CHECK(code < kNumberOfXRegisters) << code;