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we're writing some sort of compiler from Pascal to JVM Bytecode. And we've already implemented an expression tree generation, so the next step should be the creation of .class file. Can you suggest any guide/tutorial of how to generate any .class file at least from some static data? Because I've googled for 2 hours already and read JVM specification, but I really need some even simplest example to start developing the whole stuff.
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Java bytecode is the instruction set of the Java virtual machine. Each bytecode is composed of one, or in some cases two bytes that represent the instruction (opcode), along with zero or more bytes for passing parameters. Currently, in Jan 2017, there are 205 opcodes in use out of 256 possible byte-long opcodes.
Bytecode in Java is the reason java is platform-independent, as soon as a Java program is compiled bytecode is generated. To be more precise a Java bytecode is the machine code in the form of a . class file. A bytecode in Java is the instruction set for Java Virtual Machine and acts similar to an assembler.
A method's bytecode stream is a sequence of instructions for the Java virtual machine. Each instruction consists of a one-byte opcode followed by zero or more operands. The opcode indicates the action to take.
Bytecode is the compiled format for Java programs. Once a Java program has been converted to bytecode, it can be transferred across a network and executed by Java Virtual Machine (JVM). Bytecode files generally have a . class extension.
Someone has already written a widely-used byte code generation library: CGLIB.
You'd have it knocked if you could figure out how to get your AST into CGLIB.
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