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README

write-your-own-jvm

implement a simple jvm with java

项目文档

博客版

公众号版

notion 版

notion 版的进度要快，因为发公众号图要一张一张搞，调格式啥的，麻烦！ 但是看 notion 版要翻墙！！！ - 写自己的JVM（0x1）- 加载class文件 - 写自己的JVM（0x2）- 解析class文件 - 写自己的JVM（0x3）- 实现虚拟机栈 - 写自己的JVM（0x4）- 实现解释器 - 写自己的JVM（0x5）- 实现方法区 - 写自己的JVM（0x6）- 方法调用与参数传递 - 写自己的JVM（0x7）- invokedynamic - 写自己的JVM（0x8）- 数组与String - 写自己的JVM（0x9）- native方法与反射 - 写自己的JVM（0xA）- 异常处理

为啥突然多了这么多 star ???

Extension points exported contracts — how you extend this code

ConstantInfo (Interface)
Constant Type Value CONSTANT_Class 7 CONSTANT_Fieldref 9 CONSTANT_Methodref [26 implementers]
app/src/main/java/write/your/own/jvm/classfile/constantpool/ConstantInfo.java
Instruction (Interface)
每条指令都以一个单字节的操作码（opcode）开头，这就是字节码名称的由来。 由于只使用一字节表示操作码，显而易见，Java虚拟机最多只能支持256条指令。 和汇编语言类似，为了便于记忆，Java虚拟机规范给每个操作码都指定了一个助 [351 …
app/src/main/java/write/your/own/jvm/instruction/Instruction.java
NativeMethod (Interface)
(no doc) [84 implementers]
app/src/main/java/write/your/own/jvm/vnative/NativeMethod.java
Entry (Interface)
(no doc) [8 implementers]
app/src/main/java/write/your/own/jvm/classpath/Entry.java

Core symbols most depended-on inside this repo

getOperandStack
called by 380
app/src/main/java/write/your/own/jvm/runtimedata/StackFrame.java
popInt
called by 87
app/src/main/java/write/your/own/jvm/runtimedata/OperandStack.java
getLocalVariableTable
called by 85
app/src/main/java/write/your/own/jvm/runtimedata/StackFrame.java
nextU2ToInt
called by 79
app/src/main/java/write/your/own/jvm/classfile/ClassReader.java
pushInt
called by 77
app/src/main/java/write/your/own/jvm/runtimedata/OperandStack.java
getMyClass
called by 56
app/src/main/java/write/your/own/jvm/runtimedata/heap/MyObject.java
getInstance
called by 47
app/src/main/java/write/your/own/jvm/vnative/NativeRegistry.java
pushRef
called by 47
app/src/main/java/write/your/own/jvm/runtimedata/OperandStack.java

Shape

Method 1,416
Class 439
Interface 5

Languages

Java100%
Kotlin1%

Modules by API surface

app/src/main/java/write/your/own/jvm/runtimedata/heap/MyClass.java70 symbols
app/src/main/java/write/your/own/jvm/instruction/extended/Wide.java40 symbols
app/src/main/java/write/your/own/jvm/classfile/ClassFile.java27 symbols
app/src/main/java/write/your/own/jvm/vnative/java/lang/NClass.java22 symbols
app/src/main/java/write/your/own/jvm/runtimedata/heap/ClassMember.java22 symbols
app/src/main/java/write/your/own/jvm/runtimedata/heap/MyClassLoader.java21 symbols
app/src/main/java/write/your/own/jvm/vnative/sun/misc/NUnsafe.java20 symbols
app/src/main/java/write/your/own/jvm/runtimedata/OperandStack.java18 symbols
app/src/main/java/write/your/own/jvm/runtimedata/heap/MyMethod.java15 symbols
app/src/main/java/write/your/own/jvm/runtimedata/LocalVariableTable.java15 symbols
app/src/main/java/write/your/own/jvm/classfile/MemberInfo.java13 symbols
app/src/main/java/write/your/own/jvm/runtimedata/heap/MyObject.java12 symbols

For agents

$ claude mcp add write-your-own-jvm \
  -- python -m otcore.mcp_server <graph>

⬇ download graph artifact

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