Constant pool management

These functions generate the constant pool for the Java class file.

void constant_pool_start()
Initializes the constant pool. Reserves space for the constant_pool_count and starts indexing at 1.
void constant_pool_end()
Finalizes the constant pool by patching the total entry count at the reserved location.

Each function adds an entry and increments the counter.

UTF-8 String → constant_utf8(const char *string)
Stores a UTF-8 encoded string.
Integer → constant_integer(uint32_t value)
Stores a 4-byte integer.
Float → constant_float(uint32_t value)
Stores a 4-byte floating-point number.
Long → constant_long(uint64_t value)
Stores an 8-byte long integer (split into two 4-byte chunks).
Double → constant_double(uint64_t value)
Stores an 8-byte double-precision float (split into two 4-byte chunks).
Class Reference → constant_class(uint16_t name_index)
Stores a reference to a class (index to a UTF-8 string in the pool).
String Reference → constant_string(uint16_t string_index)
Stores a reference to a string (index to a UTF-8 string in the pool).
Field Reference → constant_fieldref(uint16_t class_index, uint16_t name_and_type_index)
Stores a reference to a field (links a class to a name-and-type pair).
Method Reference → constant_methodref(uint16_t class_index, uint16_t name_and_type_index)
Stores a reference to a method (links a class to a name-and-type pair).
Interface Method Reference → constant_interfacemethodref(uint16_t class_index, uint16_t name_and_type_index)
Stores a reference to an interface method.
Name and Type Descriptor → constant_nameandtype(uint16_t name_index, uint16_t descriptor_index)
Stores a name and type pair (used in method/field references).

void increment_cp_counter()
Increases the constant pool counter.
void patch_u2(size_t pos, uint16_t v)
Updates a 2-byte value in the buffer.
void patch_u4(size_t pos, uint32_t v)
Updates a 4-byte value in the buffer.

constant_pool_start();
constant_utf8("System");
constant_integer(42);
constant_class(1); // Refers to first UTF-8 entry
constant_pool_end();

This will create a constant pool with a UTF-8 string, an integer, and a class reference.

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