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gingerBill
2024-06-09 17:15:08 +01:00
parent 7e60e21934
commit 828870004b
1 changed files with 14 additions and 14 deletions
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base/runtime/wasm_allocator.odin
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@@ -7,20 +7,20 @@ import "base:intrinsics"
Port of emmalloc, modified for use in Odin. Port of emmalloc, modified for use in Odin.
Invariants: Invariants:
- Per-allocation header overhead is 8 bytes, smallest allocated payload - Per-allocation header overhead is 8 bytes, smallest allocated payload
amount is 8 bytes, and a multiple of 4 bytes. amount is 8 bytes, and a multiple of 4 bytes.
- Acquired memory blocks are subdivided into disjoint regions that lie - Acquired memory blocks are subdivided into disjoint regions that lie
next to each other. next to each other.
- A region is either in used or free. - A region is either in used or free.
Used regions may be adjacent, and a used and unused region Used regions may be adjacent, and a used and unused region
may be adjacent, but not two unused ones - they would be may be adjacent, but not two unused ones - they would be
merged. merged.
- Memory allocation takes constant time, unless the alloc needs to wasm_memory_grow() - Memory allocation takes constant time, unless the alloc needs to wasm_memory_grow()
or memory is very close to being exhausted. or memory is very close to being exhausted.
- Free and used regions are managed inside "root regions", which are slabs - Free and used regions are managed inside "root regions", which are slabs
of memory acquired via wasm_memory_grow(). of memory acquired via wasm_memory_grow().
- Memory retrieved using wasm_memory_grow() can not be given back to the OS. - Memory retrieved using wasm_memory_grow() can not be given back to the OS.
Therefore, frees are internal to the allocator. Therefore, frees are internal to the allocator.
Copyright (c) 2010-2014 Emscripten authors, see AUTHORS file. Copyright (c) 2010-2014 Emscripten authors, see AUTHORS file.