Exceptions table management

Overview

These functions manage the exceptions table section of the Java class file. The exceptions table describes the exception handlers for different sections of the bytecode.

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1. Exception Table Management

• void exceptions_start()
  Initializes the exceptions table. Reserves space for the exception_table_length and starts the counter for entries.

• void exception_entry(uint16_t start_pc, uint16_t end_pc, uint16_t handler_pc, uint16_t catch_type)
  Adds an entry to the exception table for a specific range of bytecode instructions and their associated exception handler.

• void exceptions_end()
  Finalizes the exceptions table by patching the exception_table_length at the reserved location.

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2. Utility Functions

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

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

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Usage Example

exceptions_start();
exception_entry(0, 10, 20, 1); // Defines an exception handler for a specific bytecode range
exception_entry(30, 50, 60, 2); // Another exception handler
exceptions_end();

This will generate an exceptions table with two entries.

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