您可以使用Apache软件基金会的BCEL。使用这个工具，您可以生成类似汇编程序的代码，但它是带有BCEL API的Java。您可以学习如何生成中间语言代码(在本例中是字节代码)。

简单的例子

用这个函数创建一个Java类: maxAsString(int a, int b) { If (a > b) { 返回Integer.valueOf(一).toString (); } if (a < b) { 返回Integer.valueOf (b) .toString (); }其他{ 返回“=”; ｝ ｝

现在用这个类运行BCELifier

BCELifier bcelifier = new BCELifier("MyClass", System.out);
bcelifier.start();

您可以在控制台上看到整个类的结果(如何构建字节代码MyClass.java)。该函数的代码如下:

private void createMethod_1() {
  InstructionList il = new InstructionList();
  MethodGen method = new MethodGen(ACC_PUBLIC, Type.STRING, new Type[] { Type.INT, Type.INT }, new String[] { "arg0", "arg1" }, "maxAsString", "MyClass", il, _cp);

  il.append(InstructionFactory.createLoad(Type.INT, 1)); // Load first parameter to address 1
  il.append(InstructionFactory.createLoad(Type.INT, 2)); // Load second parameter to adress 2
    BranchInstruction if_icmple_2 = InstructionFactory.createBranchInstruction(Constants.IF_ICMPLE, null); // Do if condition (compare a > b)
  il.append(if_icmple_2);
  il.append(InstructionFactory.createLoad(Type.INT, 1)); // Load value from address 1 into the stack
  il.append(_factory.createInvoke("java.lang.Integer", "valueOf", new ObjectType("java.lang.Integer"), new Type[] { Type.INT }, Constants.INVOKESTATIC));
  il.append(_factory.createInvoke("java.lang.Integer", "toString", Type.STRING, Type.NO_ARGS, Constants.INVOKEVIRTUAL));
  il.append(InstructionFactory.createReturn(Type.OBJECT));
  InstructionHandle ih_13 = il.append(InstructionFactory.createLoad(Type.INT, 1));
  il.append(InstructionFactory.createLoad(Type.INT, 2));
    BranchInstruction if_icmpge_15 = InstructionFactory.createBranchInstruction(Constants.IF_ICMPGE, null); // Do if condition (compare a < b)
  il.append(if_icmpge_15);
  il.append(InstructionFactory.createLoad(Type.INT, 2));
  il.append(_factory.createInvoke("java.lang.Integer", "valueOf", new ObjectType("java.lang.Integer"), new Type[] { Type.INT }, Constants.INVOKESTATIC));
  il.append(_factory.createInvoke("java.lang.Integer", "toString", Type.STRING, Type.NO_ARGS, Constants.INVOKEVIRTUAL));
  il.append(InstructionFactory.createReturn(Type.OBJECT));
  InstructionHandle ih_26 = il.append(new PUSH(_cp, "equals")); // Return "equals" string
  il.append(InstructionFactory.createReturn(Type.OBJECT));
  if_icmple_2.setTarget(ih_13);
  if_icmpge_15.setTarget(ih_26);
  method.setMaxStack();
  method.setMaxLocals();
  _cg.addMethod(method.getMethod());
  il.dispose();
}

每当我想尝试一种新的语言想法时，我就写一个简单的解析器，让它生成一些容易获得良好编译器的语言，比如C。

你认为c++是如何完成的?

弗雷泽和汉森的LCC编译器(维基百科)(项目主页)(github.com/drh/lcc)在他们的书“A Retargetable C编译器:设计和实现”中有描述。它是相当可读的，并解释了整个编译器，直到代码生成。

资源清单:

A Nanopass Framework for Compiler Education ¶ Advanced Compiler Design and Implementation $ An Incremental Approach to Compiler Construction ¶ ANTLR 3.x Video Tutorial Basics of Compiler Design Building a Parrot Compiler Compiler Basics Compiler Construction $ Compiler Design and Construction $ Crafting a Compiler with C $ Crafting Interpreters [Compiler Design in C] 12 ¶ Compilers: Principles, Techniques, and Tools $ — aka "The Dragon Book"; widely considered "the book" for compiler writing. Engineering a Compiler $ Essentials of Programming Languages Flipcode Article Archive (look for "Implementing A Scripting Engine by Jan Niestadt") Game Scripting Mastery $ How to build a virtual machine from scratch in C# ¶ Implementing Functional Languages Implementing Programming Languages (with BNFC) Implementing Programming Languages using C# 4.0 Interpreter pattern (described in Design Patterns $) specifies a way to evaluate sentences in a language Language Implementation Patterns: Create Your Own Domain-Specific and General Programming Languages $ Let's Build a Compiler by Jack Crenshaw — The PDF ¶ version (examples are in Pascal, but the information is generally applicable) Linkers and Loaders $ (Google Books) Lisp in Small Pieces (LiSP) $ LLVM Tutorial Modern Compiler Implementation in ML $ — There is a Java $ and C $ version as well - widely considered a very good book Object-Oriented Compiler Construction $ Parsing Techniques - A Practical Guide Project Oberon ¶ - Look at chapter 13 Programming a Personal Computer $ Programing Languages: Application and Interpretation Rabbit: A Compiler for Scheme¶ Reflections on Trusting Trust — A quick guide Roll Your Own Compiler for the .NET framework — A quick tutorial from MSDN Structure and Interpretation of Computer Programs Types and Programming Languages Want to Write a Compiler? - a quick guide Writing a Compiler in Ruby Bottom Up Compiling a Lisp — compile directly to x86-64

传说:

链接到PDF文件 $印刷书籍的链接

如果您愿意使用LLVM，请查看这个:http://llvm.org/docs/tutorial/。它教你如何使用LLVM的框架从头编写编译器，并且不假设你有任何关于这个主题的知识。

本教程建议您编写自己的解析器和lexer等，但我建议您了解bison和flex后再进行研究。它们让生活变得轻松多了。

Python附带了一个用Python编写的Python编译器。您可以看到源代码，它包括从解析、抽象语法树、发出代码等所有阶段。 破解它。