Adding and managing interfaces

Overview

These functions manage the interfaces section of the Java class file. This section lists interfaces implemented by the class.

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1. Initialization & Finalization

• void interfaces_start()
  Initializes the interfaces section. Reserves space for the interfaces_count and starts the counter at 0.

• void interfaces_end()
  Finalizes the interfaces section by patching the total entry count at the reserved location.

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2. Interface Entry Function

• Interface Reference → interface_entry(uint16_t interface_val)
  Adds an interface reference to the section. Increments the counter.

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3. Utility Functions

• void patch_u2(size_t pos, uint16_t v)
  Updates a 2-byte value in the buffer (used to finalize interfaces_count).

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Usage Example

interfaces_start();
interface_entry(1); // Adds an interface reference to the first object in the constant pool
interface_entry(2); // Adds another interface reference to the second
interfaces_end();

This will generate an interfaces section with two entries.

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