1 files changed, 47 insertions, 0 deletions
diff --git a/src/main/java/com/code_intelligence/jazzer/runtime/TraceDivHooks.java b/src/main/java/com/code_intelligence/jazzer/runtime/TraceDivHooks.java
new file mode 100644
index 00000000..c4991eb5
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+++ b/src/main/java/com/code_intelligence/jazzer/runtime/TraceDivHooks.java
@@ -0,0 +1,47 @@
+// Copyright 2021 Code Intelligence GmbH
+//
+// 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.
+
+package com.code_intelligence.jazzer.runtime;
+
+import com.code_intelligence.jazzer.api.HookType;
+import com.code_intelligence.jazzer.api.MethodHook;
+import java.lang.invoke.MethodHandle;
+
+@SuppressWarnings("unused")
+final public class TraceDivHooks {
+  @MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.Integer",
+      targetMethod = "divideUnsigned", targetMethodDescriptor = "(II)I")
+  @MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.Integer",
+      targetMethod = "remainderUnsigned", targetMethodDescriptor = "(II)I")
+  public static void
+  intUnsignedDivide(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
+    // Since the arguments are to be treated as unsigned integers we need a long to fit the
+    // divisor.
+    TraceDataFlowNativeCallbacks.traceDivLong(Integer.toUnsignedLong((int) arguments[1]), hookId);
+  }
+
+  @MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.Long",
+      targetMethod = "divideUnsigned", targetMethodDescriptor = "(JJ)J")
+  @MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.Long",
+      targetMethod = "remainderUnsigned", targetMethodDescriptor = "(JJ)J")
+  public static void
+  longUnsignedDivide(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
+    long divisor = (long) arguments[1];
+    // Run the callback only if the divisor, which is regarded as an unsigned long, fits in a
+    // signed long, i.e., does not have the sign bit set.
+    if (divisor > 0) {
+      TraceDataFlowNativeCallbacks.traceDivLong(divisor, hookId);
+    }
+  }
+}