Bytecode & Length patching

Overview

These functions manage the bytecode section of the Java class file. The bytecode section contains the actual instructions that the JVM will execute.

---

1. Bytecode Section Management

• void bytecode_start()
  Initializes the bytecode section. Reserves space for the bytecode_length and sets the offset for the bytecode.

• void ldc(1) Loads the first constant onto the stack

• void bytecode_end()
  Finalizes the bytecode section by patching the bytecode_length at the reserved location.

---

2. Utility Functions

• void patch_u4(size_t pos, uint32_t v)
  Updates a 4-byte value in the buffer (used to finalize bytecode_length).

• size_t current_offset()
  Returns the current offset in the bytecode buffer.

---

Usage Example

bytecode_start();
// bytecode functions go here
bytecode_end();

This will create a bytecode section with the proper length.

---