In the first example we encounter many of these, and we General characteristics imposed by the Java Virtual Machine's design and use of Java Virtual Machine code exhibits a set of Representing a run-time constant pool index with a hash sign andįollow the instruction by a comment identifying the run-time constantĩ invokevirtual #4 // Method Example.addTwo(II)IĬhapter, we do not worry about specifying details such as operandģ.2. Use of Constants, Local Variables, and Control Constructs Those instructions these operands are displayedīy javap (and are shown in this chapter) as more Transfer instructions are offsets from the addresses of the opcodes of Note that the actual operands of Java Virtual Machine control Instruction may be used as the target of a control transfer The instruction's opcode, and the zero orĬomments is emitted by javap the rest is supplied Index of the opcode of the instruction in the array that contains theīytes of Java Virtual Machine code for this method. In the Java programming language to Java Virtual Machine instructions. Generation, only those associated with compiling source code written This chapter does not address issues associated with code Generates platform-specific instructions only after Java Virtual Machine code hasīeen loaded. Such a translator is a just-in-time (JIT) code generator, which Of a Java Virtual Machine to the instruction set of a specific CPU. Sometimes used when referring to a translator from the instruction set The numbered sections in this chapter are Understand the Java Virtual Machine itself. The prospective compiler writer, as well as to one trying to

Understanding how one compiler utilizes the Java Virtual Machine is useful to Java Virtual Machine, and a run-time system that implements the Java Virtual Machine Source code written in the Java programming language to the instruction set of the Oracle's JDK software contains a compiler from The Java Virtual Machine machine is designed to Accessing the Run-Time Constant Pool 3.5. Use of Constants, Local Variables, and Control Constructs 3.3.

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