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// Copyright 2009 Google Inc. All Rights Reserved.
package com.google.monitoring.runtime.instrumentation;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.LocalVariablesSorter;
import org.objectweb.asm.commons.JSRInlinerAdapter;
/**
* Instruments bytecodes that allocate heap memory to call a recording hook.
* A <code>ClassVisitor</code> that processes methods with a
* <code>AllocationMethodAdapter</code> to instrument heap allocations.
*
* @author jeremymanson@google.com (Jeremy Manson)
* @author fischman@google.com (Ami Fischman) (Original Author)
*/
class AllocationClassAdapter extends ClassVisitor {
private final String recorderClass;
private final String recorderMethod;
public AllocationClassAdapter(ClassVisitor cv, String recorderClass,
String recorderMethod) {
super(Opcodes.ASM4, cv);
this.recorderClass = recorderClass;
this.recorderMethod = recorderMethod;
}
/**
* For each method in the class being instrumented, <code>visitMethod</code>
* is called and the returned MethodVisitor is used to visit the method.
* Note that a new MethodVisitor is constructed for each method.
*/
@Override
public MethodVisitor visitMethod(int access, String base, String desc,
String signature, String[] exceptions) {
MethodVisitor mv =
cv.visitMethod(access, base, desc, signature, exceptions);
if (mv != null) {
// We need to compute stackmaps (see
// AllocationInstrumenter#instrument). This can't really be
// done for old bytecode that contains JSR and RET instructions.
// So, we remove JSRs and RETs.
JSRInlinerAdapter jsria = new JSRInlinerAdapter(
mv, access, base, desc, signature, exceptions);
AllocationMethodAdapter aimv =
new AllocationMethodAdapter(jsria, recorderClass, recorderMethod);
LocalVariablesSorter lvs = new LocalVariablesSorter(access, desc, aimv);
aimv.lvs = lvs;
mv = lvs;
}
return mv;
}
}
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