Fix vtable corruption.
Due to failing to keep track of superclass implementations of
interface methods we could end up in situations where methods were
placed onto a class's vtable multiple times. This could cause virtual
and interface dispatches on subclasses to fail by causing corruption
of the subclass's vtable and iftable.
Bug: 28333278
Change-Id: I37d9740ca912daf37cdf9ff82697bbc5db46177a
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index a147aba..d29d33a 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -6635,6 +6635,15 @@
// The method is not overridable by a default method (i.e. it is directly implemented
// in some class). Therefore move onto the next interface method.
continue;
+ } else {
+ // If the super-classes method is override-able by a default method we need to keep
+ // track of it since though it is override-able it is not guaranteed to be 'overridden'.
+ // If it turns out not to be overridden and we did not keep track of it we might add it
+ // to the vtable twice, causing corruption in this class and possibly any subclasses.
+ DCHECK(vtable_impl == nullptr || vtable_impl == supers_method)
+ << "vtable_impl was " << PrettyMethod(vtable_impl) << " and not 'nullptr' or "
+ << PrettyMethod(supers_method) << " as expected. IFTable appears to be corrupt!";
+ vtable_impl = supers_method;
}
}
// If we haven't found it yet we should search through the interfaces for default methods.
diff --git a/test/960-default-smali/expected.txt b/test/960-default-smali/expected.txt
index 7671eed..f3db93f 100644
--- a/test/960-default-smali/expected.txt
+++ b/test/960-default-smali/expected.txt
@@ -82,3 +82,19 @@
J-interface Greeter.SayHiTwice()='Hi Hi '
J-virtual J.SayHiTwice()='Hi Hi '
End testing for type J
+Testing for type K
+K-interface Foo.bar()='foobar'
+K-virtual K.bar()='foobar'
+End testing for type K
+Testing for type L
+L-interface Foo.bar()='foobar'
+L-virtual K.bar()='foobar'
+L-virtual L.bar()='foobar'
+End testing for type L
+Testing for type M
+M-interface Foo.bar()='BAZ!'
+M-interface Fooer.bar()='BAZ!'
+M-virtual K.bar()='BAZ!'
+M-virtual L.bar()='BAZ!'
+M-virtual M.bar()='BAZ!'
+End testing for type M
diff --git a/test/960-default-smali/src/Foo.java b/test/960-default-smali/src/Foo.java
new file mode 100644
index 0000000..ed5b35f
--- /dev/null
+++ b/test/960-default-smali/src/Foo.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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
+ * limitations under the License.
+ */
+interface Foo {
+ public default String bar() {
+ return "foobar";
+ }
+}
diff --git a/test/960-default-smali/src/Fooer.java b/test/960-default-smali/src/Fooer.java
new file mode 100644
index 0000000..d8a5f61
--- /dev/null
+++ b/test/960-default-smali/src/Fooer.java
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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
+ * limitations under the License.
+ */
+
+interface Fooer extends Foo {
+ public String bar();
+}
diff --git a/test/960-default-smali/src/K.java b/test/960-default-smali/src/K.java
new file mode 100644
index 0000000..4426be7
--- /dev/null
+++ b/test/960-default-smali/src/K.java
@@ -0,0 +1,17 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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
+ * limitations under the License.
+ */
+
+class K implements Foo { }
diff --git a/test/960-default-smali/src/L.java b/test/960-default-smali/src/L.java
new file mode 100644
index 0000000..c08ab72
--- /dev/null
+++ b/test/960-default-smali/src/L.java
@@ -0,0 +1,17 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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
+ * limitations under the License.
+ */
+
+class L extends K { }
diff --git a/test/960-default-smali/src/M.java b/test/960-default-smali/src/M.java
new file mode 100644
index 0000000..affe7e9
--- /dev/null
+++ b/test/960-default-smali/src/M.java
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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
+ * limitations under the License.
+ */
+
+class M extends L implements Fooer {
+ public String bar() {
+ return "BAZ!";
+ }
+}
diff --git a/test/960-default-smali/src/classes.xml b/test/960-default-smali/src/classes.xml
index 0aa41f7..f3e50c5 100644
--- a/test/960-default-smali/src/classes.xml
+++ b/test/960-default-smali/src/classes.xml
@@ -81,6 +81,27 @@
<implements> </implements>
<methods> </methods>
</class>
+
+ <class name="K" super="java/lang/Object">
+ <implements>
+ <item>Foo</item>
+ </implements>
+ <methods> </methods>
+ </class>
+
+ <class name="L" super="K">
+ <implements> </implements>
+ <methods> </methods>
+ </class>
+
+ <class name="M" super="L">
+ <implements>
+ <item>Fooer</item>
+ </implements>
+ <methods>
+ <method>bar</method>
+ </methods>
+ </class>
</classes>
<interfaces>
@@ -123,5 +144,22 @@
<method type="abstract">GetPlace</method>
</methods>
</interface>
+
+ <interface name="Foo" super="java/lang/Object">
+ <implements>
+ </implements>
+ <methods>
+ <method type="default">bar</method>
+ </methods>
+ </interface>
+
+ <interface name="Fooer" super="java/lang/Object">
+ <implements>
+ <item>Foo</item>
+ </implements>
+ <methods>
+ <method type="abstract">bar</method>
+ </methods>
+ </interface>
</interfaces>
</data>
