Module allocator 

C ABI allocator compatibility — xmlMemSetup, xmlMemGet, xmlMalloc, xmlFree, etc. (§58).

This module implements the complete memory hook system exposed by libxml2:

• Global allocator function pointers (malloc, realloc, free, strdup)
• xmlMemSetup() / xmlMemGet() — set/get allocator hooks
• xmlGcMemSetup() / xmlGcMemGet() — GC-aware allocator hooks (wrappers)
• xmlMalloc() / xmlMallocAtomic() / xmlRealloc() / xmlFree() / xmlMemStrdup()
• xmlMemUsed() / xmlMemBlocks() — allocation tracking
• xmlMemDisplay() / xmlMemShow() — debugging output

Phase 1 status

Complete — all allocator APIs are implemented with thread-safe global state.

Safety

Allocator hooks are unsafe because they operate on raw pointers and are called from C code. Every public function documents its safety contract.

Functions

xmlCleanupMemory

Clean up the memory layer.

xmlFree^⚠

Free allocated memory.

xmlGcMemGet^⚠

Get GC-aware memory allocator functions.

xmlGcMemSetup^⚠

Set GC-aware memory allocator functions.

xmlInitMemory

Initialize the memory layer with debugging support.

xmlMalloc^⚠

Allocate memory.

xmlMallocAtomic^⚠

Allocate memory that will never contain pointers to other memory.

xmlMallocAtomicZero^⚠

Allocate zero-initialized memory (atomic variant).

xmlMallocZero^⚠

Allocate zero-initialized memory.

xmlMemBlocks

Return the current number of allocated blocks (approximate).

xmlMemDisplay^⚠

Display memory allocation information to a file.

xmlMemGet^⚠

Get the current memory allocator functions.

xmlMemSetup^⚠

Set custom memory allocator functions.

xmlMemShow^⚠

Show memory allocation information.

xmlMemStrdup^⚠

Duplicate a C string using the configured allocator.

xmlMemUsed

Return the total amount of memory currently allocated (approximate).

xmlRealloc^⚠

Reallocate memory.

xmlReallocZero^⚠

Reallocate and zero-initialize the new portion.