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https://github.com/ParkerTenBroeck/ParkerTenBroeck.github.io.git
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added styles for gh md extensions, worked on generators post
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Parker TenBroeck
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5 changed files with 193 additions and 36 deletions
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@ -37,6 +37,7 @@ render_emoji = true
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bottom_footnotes = true
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github_alerts = true
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# insert_anchor_links = "heading"
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[markdown.highlighting]
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light_theme = "github-light-high-contrast"
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@ -8,10 +8,70 @@ tags = ["java", "bytecode"]
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category = ["project"]
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+++
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With the release of Java 24 came the official Class-File API giving a stable and (relatively) ergonomic interface for reading, modifying, and writing java classes/bytecode at runtime with no external dependencies. Seeing this I decided to play around with it and see what fun I could have.
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# Bytecode, Stack Machines, and Registers
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Java (and other JVM languages) are compiled to a set of [bytecode instructions](https://en.wikipedia.org/wiki/List_of_JVM_bytecode_instructions).
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These instructions primarily operate on a stack (fifo) using 0-n operands from the top and pushing 0-1 values back onto the stack.
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An example would be the `iadd` instruction which pops two integers off the stack and pushes the sum of them.
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A more complex example would be something like `invokevirtual <methodref_index>` which calls a method on a class.
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`methodref_index` is an index (in this case a 2 byte index) into the class files `constant_pool`[^1]
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[^1]: https://docs.oracle.com/javase/specs/jvms/se23/html/jvms-4.html#jvms-4.1
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> [!NOTE]
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> Highlights information that users should take into account, even when skimming.
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> [!TIP]
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> Optional information to help a user be more successful.
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> [!IMPORTANT]
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> Crucial information necessary for users to succeed.
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> [!WARNING]
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> Critical content demanding immediate user attention due to potential risks.
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> [!CAUTION]
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> Negative potential consequences of an action.
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## Stack manipulation
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Sometimes it's
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## Registers
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# Stack Machine and Registers
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# Decompilation
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# Interlude, what's a stack map?
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# Tracking everything everywhere
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# Putting everything together
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# Injection
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Take a look at the [GitHub](https://github.com/ParkerTenBroeck/generators)
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```java,linenos
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public static Future<Void, IOException> echo(@Cancellation("close") Socket socket) throws IOException {
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public static Future<Void, IOException> echo(
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@Cancellation("close") Socket socket
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) throws IOException {
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try(socket){
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var buffer = ByteBuffer.allocate(4096*2);
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while(true){
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@ -24,4 +84,17 @@ public static Future<Void, IOException> echo(@Cancellation("close") Socket socke
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}
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```
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Java (and other languages which compile for the JVM) operate on a
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```java,linenos
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public static Gen<Long, Void> primes() {
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long number = 1;
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Gen.yield(2L);
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outer: while(true){
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number += 2;
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for(long i=2; i <= Math.sqrt(number); i ++){
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if(number%i==0)continue outer;
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}
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Gen.yield(number);
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}
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}
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```
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@ -60,37 +60,37 @@ Take a look at the [GitHub](https://github.com/ParkerTenBroeck/MyCPU_16bit)
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| No Operation | 00 | 30000 | 1044000 | 800000 | | | | |
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| Bit | Function |
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| --- | --- |
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| 31 | NA |
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| 30 | NA |
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| 29 | NA |
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| 28 | NA |
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| 27 | NA |
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| 26 | NA |
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| 25 | NA |
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| 24 | Instruction Register In |
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| 23 | Micro Instruction Counter Reset |
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| 22 | Conditional Instruction Type Select Bit 3 |
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| 21 | Conditional Instruction Type Select Bit 2 |
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| 20 | Conditional Instruction Type Select Bit 1 |
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| 19 | Program Counter In |
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| 18 | Program Counter Count |
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| 17 | Program Counter Out |
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| 16 | Update Memory Address Register |
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| 15 | Memory In |
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| 14 | Memory Out |
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| 13 | Internal Screen Register In |
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| 12 | Jump Register Out |
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| 11 | Jump Register In |
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| 10 | B Register Out |
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| 9 | B Register In |
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| 8 | A Register Out |
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| 7 | A Register In |
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| 6 | Y Register Out |
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| 5 | Y Register In |
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| 4 | X Register Out |
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| 3 | X Register In |
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| 2 | ALU mode select bit 3 |
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| 1 | ALU mode select bit 2 |
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| 0 | ALU mode select bit 1 |
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| Bit | Function |
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| -- | ------------------------------------------ |
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| 31 | NA |
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| 30 | NA |
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| 29 | NA |
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| 28 | NA |
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| 27 | NA |
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| 26 | NA |
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| 25 | NA |
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| 24 | Instruction Register In |
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| 23 | Micro Instruction Counter Reset |
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| 22 | Conditional Instruction Type Select Bit 3 |
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| 21 | Conditional Instruction Type Select Bit 2 |
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| 20 | Conditional Instruction Type Select Bit 1 |
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| 19 | Program Counter In |
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| 18 | Program Counter Count |
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| 17 | Program Counter Out |
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| 16 | Update Memory Address Register |
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| 15 | Memory In |
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| 14 | Memory Out |
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| 13 | Internal Screen Register In |
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| 12 | Jump Register Out |
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| 11 | Jump Register In |
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| 10 | B Register Out |
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| 9 | B Register In |
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| 8 | A Register Out |
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| 7 | A Register In |
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| 6 | Y Register Out |
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| 5 | Y Register In |
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| 4 | X Register Out |
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| 3 | X Register In |
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| 2 | ALU mode select bit 3 |
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| 1 | ALU mode select bit 2 |
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| 0 | ALU mode select bit 1 |
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@ -172,3 +172,80 @@ th {
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}
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.markdown-alert-note {
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border-left: solid 3px var(--blue);
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padding-left: 20px;
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margin-left: 10px;
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::before{
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content: "Note";
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display: block;
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font-weight: bold;
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color: var(--blue);
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}
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}
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.markdown-alert-note {
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border-left: solid 3px var(--blue);
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padding-left: 20px;
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margin-left: 10px;
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::before{
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content: "Note";
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display: block;
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font-weight: bold;
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color: var(--blue);
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}
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}
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.markdown-alert-tip {
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border-left: solid 3px var(--green);
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padding-left: 20px;
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margin-left: 10px;
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::before{
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content: "Tip";
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display: block;
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font-weight: bold;
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color: var(--green);
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}
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}
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.markdown-alert-important {
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border-left: solid 3px var(--purple);
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padding-left: 20px;
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margin-left: 10px;
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::before{
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content: "Important";
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display: block;
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font-weight: bold;
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color: var(--purple);
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}
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}
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.markdown-alert-warning {
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border-left: solid 3px var(--yellow);
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padding-left: 20px;
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margin-left: 10px;
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::before{
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content: "Warning";
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display: block;
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font-weight: bold;
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color: var(--yellow);
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}
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}
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.markdown-alert-caution {
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border-left: solid 3px var(--red);
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padding-left: 20px;
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margin-left: 10px;
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::before{
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content: "Caution";
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display: block;
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font-weight: bold;
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color: var(--red);
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}
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}
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@ -62,6 +62,12 @@
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--primary: light-dark(#ffd979, #daa520);
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--text-highlight: color-mix(in srgb-linear, var(--primary) 50%, transparent);
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--blue: light-dark(#0969da, #1f6feb);
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--green: light-dark(#1a7f37, #3fb950);
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--purple: light-dark(#8250df, #ab7df8);
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--yellow: light-dark(#9a6700, #d29922);
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--red: light-dark(#d1242f, #f85149);
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}
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* {
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