Package com.google.monitoring.runtime.instrumentation

Class AllocationInstrumenter

java.lang.Object
com.google.monitoring.runtime.instrumentation.AllocationInstrumenter
All Implemented Interfaces:
ClassFileTransformer
public class AllocationInstrumenter extends Object implements ClassFileTransformer
Instruments bytecodes that allocate heap memory to call a recording hook. This will add a static invocation to a recorder function to any bytecode that looks like it will be allocating heap memory allowing users to implement heap profiling schemes.

  • Method Details

    • premain

      public static void premain(String agentArgs, Instrumentation inst)

    • transform

      public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] origBytes)
      Specified by:
      transform in interface ClassFileTransformer

    • instrument

      public static byte[] instrument(byte[] originalBytes, String recorderClass, String recorderMethod, ClassLoader loader)
      Given the bytes representing a class, go through all the bytecode in it and instrument any occurrences of new/newarray/anewarray/multianewarray with pre- and post-allocation hooks. Even more fun, intercept calls to the reflection API's Array.newInstance() and instrument those too.
      Parameters:
      originalBytes - the original byte[] code.
      recorderClass - the String internal name of the class containing the recorder method to run.
      recorderMethod - the String name of the recorder method to run.
      loader - the ClassLoader for this class.
      Returns:
      the instrumented byte[] code.

    • instrument

      public static byte[] instrument(byte[] originalBytes, ClassLoader loader)
      Parameters:
      originalBytes - The original version of the class.
      loader - The ClassLoader of this class.
      Returns:
      the instrumented version of this class.
      See Also: