Package org.objectweb.asm.tree.analysis

Provides a framework for static code analysis based on the asm.tree package.

Basic usage:

ClassReader classReader = new ClassReader(bytecode);
ClassNode classNode = new ClassNode();
classReader.accept(classNode, ClassReader.SKIP_DEBUG);

for (MethodNode method : classNode.methods) {
  if (method.instructions.size() > 0) {
    Analyzer analyzer = new Analyzer(new BasicInterpreter());
    analyzer.analyze(classNode.name, method);
    Frame[] frames = analyzer.getFrames();
    // Elements of the frames array now contains info for each instruction
    // from the analyzed method. BasicInterpreter creates BasicValue, that
    // is using simplified type system that distinguishes the UNINITIALZED,
    // INT, FLOAT, LONG, DOUBLE, REFERENCE and RETURNADDRESS types.
    ...
  }
}

Since:

ASM 1.4.3

Interface Summary

Interface	Description
Value	An immutable symbolic value for the semantic interpretation of bytecode.

Class Summary

Class	Description
Analyzer<V extends Value>	A semantic bytecode analyzer.
BasicInterpreter	An Interpreter for BasicValue values.
BasicValue	A Value that is represented with its type in a seven types type system.
BasicVerifier	An extended BasicInterpreter that checks that bytecode instructions are correctly used.
Frame<V extends Value>	A symbolic execution stack frame.
Interpreter<V extends Value>	A semantic bytecode interpreter.
SimpleVerifier	An extended BasicVerifier that performs more precise verifications.
SourceInterpreter	An Interpreter for SourceValue values.
SourceValue	A Value which keeps track of the bytecode instructions that can produce it.

Exception Summary

Exception	Description
AnalyzerException	An exception thrown if a problem occurs during the analysis of a method.