Bring excellent performance of dynamic memory allocation library into Dart

mimalloc is developed by Daan Leijen with significant improvment of efficiency in comparison with default allocator from the systems. This is a Dart ported package by usign ffigen and hooks approach to compile mimalloc v3 from Git repository and replicate malloc and calloc features from ffi package.

REMARK 1: This package aims to deliver an alternative option of dynamic memory allocation without overriding original dynamic memory allocation function.

REMARK 2: It is unnecessary to import this library if mimalloc is loaded through override method.

How to uses

1. Add mimalloc_ffi package by either editing pubspec.yaml or execute this command:

   dart pub add mimalloc_ffi

   • It is strongly recommanded to add ffi at the same time if string conversion or arena of allocation are demanded.
2. Import library:

   import "package:mimalloc_ffi/mimalloc_ffi.dart";
   // It is suggested to hide system allocators to avoid accidential uses
   import "package:ffi/ffi.dart"
       hide
           malloc,
           calloc,
           MallocAllocator,
           CallocAllocator;

3. (Only appliable when using APIs from ffi packages) Ensure optional arguement wrappedAllocator is specified to either miMalloc or miCalloc:

   import "dart:ffi" as ffi;
   
   final arenaResult = using<String>(
       (arena) {
           // Do something with arena
       },
       miCalloc,
   );
   final zoneArenaResult = withZoneArena(
       computationFunc,
       miCalloc,
   );
   
   // String handling
   void handleStr() {
       const String sampleText = "範本";
   
       final utf8Str = sampleText.toNativeUtf8(allocator: miMalloc);
       final utf16Str = sampleText.toNativeUtf16(allocator: miMalloc);
       
       // Remember free dynamic allocated library
       <ffi.Pointer>[utf8Str, utf16Str].forEach(miMalloc.free);
   }

Licenses

• MIT license for mimalloc source code and mimalloc.g.dart through ffigen tool.
• Remaining part in this package are applied in BSD-3 license.