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Merge pull request #4751 from Barinzaya/arena-grow-in-place

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Grow-in-place for some arenas
This commit is contained in:
gingerBill
2025-01-27 09:59:09 +00:00
committed by GitHub
parent 6572a52a84 98b3a9eacd
commit 2e64cf7ef5
2 changed files with 36 additions and 8 deletions
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22
base/runtime/default_temp_allocator_arena.odin
View File

@@ -210,10 +210,24 @@ arena_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
case size == 0:
err = .Mode_Not_Implemented
return
case (uintptr(old_data) & uintptr(alignment-1) == 0) && size < old_size:
// shrink data in-place
data = old_data[:size]
return
case uintptr(old_data) & uintptr(alignment-1) == 0:
if size < old_size {
// shrink data in-place
data = old_data[:size]
return
}
if block := arena.curr_block; block != nil {
start := uint(uintptr(old_memory)) - uint(uintptr(block.base))
old_end := start + old_size
new_end := start + size
if start < old_end && old_end == block.used && new_end <= block.capacity {
// grow data in-place, adjusting next allocation
block.used = uint(new_end)
data = block.base[start:new_end]
return
}
}
}
new_memory := arena_alloc(arena, size, alignment, location) or_return

22
core/mem/virtual/arena.odin
View File

@@ -328,10 +328,24 @@ arena_allocator_proc :: proc(allocator_data: rawptr, mode: mem.Allocator_Mode,
case size == 0:
err = .Mode_Not_Implemented
return
case (uintptr(old_data) & uintptr(alignment-1) == 0) && size < old_size:
// shrink data in-place
data = old_data[:size]
return
case uintptr(old_data) & uintptr(alignment-1) == 0:
if size < old_size {
// shrink data in-place
data = old_data[:size]
return
}
if block := arena.curr_block; block != nil {
start := uint(uintptr(old_memory)) - uint(uintptr(block.base))
old_end := start + old_size
new_end := start + size
if start < old_end && old_end == block.used && new_end <= block.reserved {
// grow data in-place, adjusting next allocation
_ = alloc_from_memory_block(block, new_end - old_end, 1, default_commit_size=arena.default_commit_size) or_return
data = block.base[start:new_end]
return
}
}
}
new_memory := arena_alloc(arena, size, alignment, location) or_return