Intercept JNI invocation of String.<init> methods.

libmono uses JNI AllocObject and CallNonvirtualVoidMethod to create and
initialize a string instead of using the recommended NewObject. This
change adds an intercept to change the String.<init> call to a
StringFactory call instead. Then, it uses the object id of the original
string object referrer and maps it to the result of the StringFactory.

Bug: 21288130
Change-Id: Ib4db402c178bc37188d5c5faf30b6e4fdc747b17

1 files changed, 11 insertions, 0 deletions

diff --git a/runtime/indirect_reference_table.h b/runtime/indirect_reference_table.h
index a0e53af..dea5dfd 100644
--- a/runtime/indirect_reference_table.h
+++ b/runtime/indirect_reference_table.h
@@ -213,6 +213,10 @@ class IrtEntry {
   uint32_t GetSerial() const {
     return serial_;
   }
+  void SetReference(mirror::Object* obj) {
+    DCHECK_LT(serial_, kIRTPrevCount);
+    references_[serial_] = GcRoot<mirror::Object>(obj);
+  }
 
  private:
   uint32_t serial_;
@@ -294,6 +298,13 @@ class IndirectReferenceTable {
   }
 
   /*
+   * Update an existing entry.
+   *
+   * Updates an existing indirect reference to point to a new object.
+   */
+  void Update(IndirectRef iref, mirror::Object* obj) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+  /*
    * Remove an existing entry.
    *
    * If the entry is not between the current top index and the bottom index