bitmap_allocator: improve/fix `free`
This previously had logic in it that was very wrong and could lead to memory corruption or a failure to properly mark data as freed. Also introduces a bunch of tests for various edge case behavior.pull/8276/head
Qwerasd
parent
058a91d217
commit
6d7982c8ca
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@ -108,28 +108,59 @@ pub fn BitmapAllocator(comptime chunk_size: comptime_int) type {
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const chunks = self.chunks.ptr(base);
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const chunk_idx = @divExact(@intFromPtr(slice.ptr) - @intFromPtr(chunks), chunk_size);
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// From the chunk index, we can find the starting bitmap index
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// and the bit within the last bitmap.
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var bitmap_idx = @divFloor(chunk_idx, 64);
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const bitmap_bit = chunk_idx % 64;
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const bitmaps = self.bitmap.ptr(base);
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// If our chunk count is over 64 then we need to handle the
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// case where we have to mark multiple bitmaps.
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if (chunk_count > 64) {
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const bitmaps_full = @divFloor(chunk_count, 64);
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for (0..bitmaps_full) |i| bitmaps[bitmap_idx + i] = std.math.maxInt(u64);
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bitmap_idx += bitmaps_full;
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// Current bitmap index.
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var i: usize = @divFloor(chunk_idx, 64);
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// Number of chunks we still have to mark as free.
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var rem: usize = chunk_count;
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// Mark any bits in the starting bitmap that need to be marked.
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{
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// Bit index.
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const bit = chunk_idx % 64;
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// Number of bits we need to mark in this bitmap.
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const bits = @min(rem, 64 - bit);
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bitmaps[i] |= ~@as(u64, 0) >> @intCast(64 - bits) << @intCast(bit);
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rem -= bits;
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}
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// Set the bitmap to mark the chunks as free. Note we have to
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// do chunk_count % 64 to handle the case where our chunk count
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// is using multiple bitmaps.
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const bitmap = &bitmaps[bitmap_idx];
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for (0..chunk_count % 64) |i| {
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const mask = @as(u64, 1) << @intCast(bitmap_bit + i);
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bitmap.* |= mask;
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// Mark any full bitmaps worth of bits that need to be marked.
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i += 1;
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while (rem > 64) : (i += 1) {
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bitmaps[i] = std.math.maxInt(u64);
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rem -= 64;
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}
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// Mark any bits at the start of this last bitmap if it needs it.
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if (rem > 0) {
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bitmaps[i] |= ~@as(u64, 0) >> @intCast(64 - rem);
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}
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}
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/// For testing only.
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fn isAllocated(self: *Self, base: anytype, slice: anytype) bool {
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comptime assert(@import("builtin").is_test);
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const bytes = std.mem.sliceAsBytes(slice);
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const aligned_len = std.mem.alignForward(usize, bytes.len, chunk_size);
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const chunk_count = @divExact(aligned_len, chunk_size);
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const chunks = self.chunks.ptr(base);
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const chunk_idx = @divExact(@intFromPtr(slice.ptr) - @intFromPtr(chunks), chunk_size);
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const bitmaps = self.bitmap.ptr(base);
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for (chunk_idx..chunk_idx + chunk_count) |i| {
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const bitmap = @divFloor(i, bitmap_bit_size);
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const bit = i % bitmap_bit_size;
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if (bitmaps[bitmap] & (@as(u64, 1) << @intCast(bit)) != 0) {
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return false;
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}
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}
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return true;
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}
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/// For debugging
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@ -489,3 +520,438 @@ test "BitmapAllocator alloc large" {
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ptr[0] = 'A';
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bm.free(buf, ptr);
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}
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test "BitmapAllocator alloc and free one bitmap" {
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const Alloc = BitmapAllocator(1);
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// Capacity such that we'll have 3 bitmaps.
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const cap = Alloc.bitmap_bit_size * 3;
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const testing = std.testing;
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const alloc = testing.allocator;
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const layout = Alloc.layout(cap);
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const buf = try alloc.alignedAlloc(u8, Alloc.base_align, layout.total_size);
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defer alloc.free(buf);
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var bm = Alloc.init(.init(buf), layout);
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// Allocate exactly one bitmap worth of bytes.
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const slice = try bm.alloc(u8, buf, Alloc.bitmap_bit_size);
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try testing.expectEqual(Alloc.bitmap_bit_size, slice.len);
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@memset(slice, 0x11);
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try testing.expectEqualSlices(
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u8,
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&@as([Alloc.bitmap_bit_size]u8, @splat(0x11)),
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slice,
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);
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// Free it
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try testing.expect(bm.isAllocated(buf, slice));
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bm.free(buf, slice);
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try testing.expect(!bm.isAllocated(buf, slice));
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// All of our bitmaps should be free.
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try testing.expectEqualSlices(
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u64,
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&@as([3]u64, @splat(~@as(u64, 0))),
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bm.bitmap.ptr(buf)[0..3],
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);
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}
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test "BitmapAllocator alloc and free half bitmap" {
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const Alloc = BitmapAllocator(1);
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// Capacity such that we'll have 3 bitmaps.
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const cap = Alloc.bitmap_bit_size * 3;
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const testing = std.testing;
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const alloc = testing.allocator;
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const layout = Alloc.layout(cap);
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const buf = try alloc.alignedAlloc(u8, Alloc.base_align, layout.total_size);
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defer alloc.free(buf);
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var bm = Alloc.init(.init(buf), layout);
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// Allocate exactly half a bitmap worth of bytes.
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const slice = try bm.alloc(u8, buf, Alloc.bitmap_bit_size / 2);
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try testing.expectEqual(Alloc.bitmap_bit_size / 2, slice.len);
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@memset(slice, 0x11);
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try testing.expectEqualSlices(
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u8,
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&@as([Alloc.bitmap_bit_size / 2]u8, @splat(0x11)),
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slice,
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);
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// Free it
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try testing.expect(bm.isAllocated(buf, slice));
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bm.free(buf, slice);
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try testing.expect(!bm.isAllocated(buf, slice));
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// All of our bitmaps should be free.
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try testing.expectEqualSlices(
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u64,
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&@as([3]u64, @splat(~@as(u64, 0))),
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bm.bitmap.ptr(buf)[0..3],
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);
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}
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test "BitmapAllocator alloc and free two half bitmaps" {
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const Alloc = BitmapAllocator(1);
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// Capacity such that we'll have 3 bitmaps.
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const cap = Alloc.bitmap_bit_size * 3;
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const testing = std.testing;
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const alloc = testing.allocator;
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const layout = Alloc.layout(cap);
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const buf = try alloc.alignedAlloc(u8, Alloc.base_align, layout.total_size);
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defer alloc.free(buf);
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var bm = Alloc.init(.init(buf), layout);
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// Allocate exactly one bitmap worth of bytes across two allocations.
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const slice = try bm.alloc(u8, buf, Alloc.bitmap_bit_size / 2);
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try testing.expectEqual(Alloc.bitmap_bit_size / 2, slice.len);
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@memset(slice, 0x11);
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try testing.expectEqualSlices(
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u8,
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&@as([Alloc.bitmap_bit_size / 2]u8, @splat(0x11)),
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slice,
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);
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const slice2 = try bm.alloc(u8, buf, Alloc.bitmap_bit_size / 2);
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try testing.expectEqual(Alloc.bitmap_bit_size / 2, slice2.len);
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@memset(slice2, 0x22);
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try testing.expectEqualSlices(
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u8,
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&@as([Alloc.bitmap_bit_size / 2]u8, @splat(0x22)),
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slice2,
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);
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try testing.expectEqualSlices(
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u8,
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&@as([Alloc.bitmap_bit_size / 2]u8, @splat(0x11)),
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slice,
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);
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// Free them
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try testing.expect(bm.isAllocated(buf, slice2));
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bm.free(buf, slice2);
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try testing.expect(!bm.isAllocated(buf, slice2));
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try testing.expect(bm.isAllocated(buf, slice));
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bm.free(buf, slice);
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try testing.expect(!bm.isAllocated(buf, slice));
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// All of our bitmaps should be free.
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try testing.expectEqualSlices(
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u64,
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&@as([3]u64, @splat(~@as(u64, 0))),
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bm.bitmap.ptr(buf)[0..3],
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);
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}
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test "BitmapAllocator alloc and free 1.5 bitmaps" {
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const Alloc = BitmapAllocator(1);
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// Capacity such that we'll have 3 bitmaps.
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const cap = Alloc.bitmap_bit_size * 3;
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const testing = std.testing;
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const alloc = testing.allocator;
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const layout = Alloc.layout(cap);
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const buf = try alloc.alignedAlloc(u8, Alloc.base_align, layout.total_size);
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defer alloc.free(buf);
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var bm = Alloc.init(.init(buf), layout);
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// Allocate exactly 1.5 bitmaps worth of bytes.
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const slice = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 2);
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try testing.expectEqual(3 * Alloc.bitmap_bit_size / 2, slice.len);
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@memset(slice, 0x11);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 2]u8, @splat(0x11)),
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slice,
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);
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// Free them
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try testing.expect(bm.isAllocated(buf, slice));
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bm.free(buf, slice);
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try testing.expect(!bm.isAllocated(buf, slice));
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// All of our bitmaps should be free.
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try testing.expectEqualSlices(
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u64,
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&@as([3]u64, @splat(~@as(u64, 0))),
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bm.bitmap.ptr(buf)[0..3],
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);
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}
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test "BitmapAllocator alloc and free two 1.5 bitmaps" {
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const Alloc = BitmapAllocator(1);
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// Capacity such that we'll have 3 bitmaps.
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const cap = Alloc.bitmap_bit_size * 3;
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const testing = std.testing;
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const alloc = testing.allocator;
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const layout = Alloc.layout(cap);
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const buf = try alloc.alignedAlloc(u8, Alloc.base_align, layout.total_size);
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defer alloc.free(buf);
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var bm = Alloc.init(.init(buf), layout);
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// Allocate exactly 3 bitmaps worth of bytes across two allocations.
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const slice = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 2);
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try testing.expectEqual(3 * Alloc.bitmap_bit_size / 2, slice.len);
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@memset(slice, 0x11);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 2]u8, @splat(0x11)),
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slice,
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);
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const slice2 = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 2);
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try testing.expectEqual(3 * Alloc.bitmap_bit_size / 2, slice2.len);
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@memset(slice2, 0x22);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 2]u8, @splat(0x22)),
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slice2,
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);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 2]u8, @splat(0x11)),
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slice,
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);
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// Free them
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try testing.expect(bm.isAllocated(buf, slice2));
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bm.free(buf, slice2);
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try testing.expect(!bm.isAllocated(buf, slice2));
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try testing.expect(bm.isAllocated(buf, slice));
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bm.free(buf, slice);
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try testing.expect(!bm.isAllocated(buf, slice));
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// All of our bitmaps should be free.
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try testing.expectEqualSlices(
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u64,
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&@as([3]u64, @splat(~@as(u64, 0))),
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bm.bitmap.ptr(buf)[0..3],
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);
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}
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test "BitmapAllocator alloc and free 1.5 bitmaps offset by 0.75" {
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const Alloc = BitmapAllocator(1);
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// Capacity such that we'll have 3 bitmaps.
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const cap = Alloc.bitmap_bit_size * 3;
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const testing = std.testing;
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const alloc = testing.allocator;
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const layout = Alloc.layout(cap);
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const buf = try alloc.alignedAlloc(u8, Alloc.base_align, layout.total_size);
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defer alloc.free(buf);
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var bm = Alloc.init(.init(buf), layout);
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// Allocate three quarters of a bitmap first.
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const slice = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 4);
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try testing.expectEqual(3 * Alloc.bitmap_bit_size / 4, slice.len);
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@memset(slice, 0x11);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x11)),
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slice,
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);
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// Then a 1.5 bitmap sized allocation, so that it spans
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// from 0.75 to 2.25, occupying bits in 3 different bitmaps.
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const slice2 = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 2);
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try testing.expectEqual(3 * Alloc.bitmap_bit_size / 2, slice2.len);
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@memset(slice2, 0x22);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 2]u8, @splat(0x22)),
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slice2,
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);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x11)),
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slice,
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);
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// Free them
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try testing.expect(bm.isAllocated(buf, slice2));
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bm.free(buf, slice2);
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try testing.expect(!bm.isAllocated(buf, slice2));
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try testing.expect(bm.isAllocated(buf, slice));
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bm.free(buf, slice);
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try testing.expect(!bm.isAllocated(buf, slice));
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// All of our bitmaps should be free.
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try testing.expectEqualSlices(
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u64,
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&@as([3]u64, @splat(~@as(u64, 0))),
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bm.bitmap.ptr(buf)[0..3],
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);
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}
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test "BitmapAllocator alloc and free three 0.75 bitmaps" {
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const Alloc = BitmapAllocator(1);
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// Capacity such that we'll have 3 bitmaps.
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const cap = Alloc.bitmap_bit_size * 3;
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const testing = std.testing;
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const alloc = testing.allocator;
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const layout = Alloc.layout(cap);
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const buf = try alloc.alignedAlloc(u8, Alloc.base_align, layout.total_size);
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defer alloc.free(buf);
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var bm = Alloc.init(.init(buf), layout);
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// Allocate three quarters of a bitmap three times.
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const slice = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 4);
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try testing.expectEqual(3 * Alloc.bitmap_bit_size / 4, slice.len);
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@memset(slice, 0x11);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x11)),
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slice,
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);
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const slice2 = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 4);
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try testing.expectEqual(3 * Alloc.bitmap_bit_size / 4, slice2.len);
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@memset(slice2, 0x22);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x22)),
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slice2,
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);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x11)),
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slice,
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);
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const slice3 = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 4);
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try testing.expectEqual(3 * Alloc.bitmap_bit_size / 4, slice3.len);
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@memset(slice3, 0x33);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x33)),
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slice3,
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);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x22)),
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slice2,
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);
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try testing.expectEqualSlices(
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u8,
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&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x11)),
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slice,
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);
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// Free them
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try testing.expect(bm.isAllocated(buf, slice2));
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bm.free(buf, slice2);
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try testing.expect(!bm.isAllocated(buf, slice2));
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try testing.expect(bm.isAllocated(buf, slice));
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bm.free(buf, slice);
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try testing.expect(!bm.isAllocated(buf, slice));
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try testing.expect(bm.isAllocated(buf, slice3));
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bm.free(buf, slice3);
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try testing.expect(!bm.isAllocated(buf, slice3));
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// All of our bitmaps should be free.
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try testing.expectEqualSlices(
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u64,
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&@as([3]u64, @splat(~@as(u64, 0))),
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bm.bitmap.ptr(buf)[0..3],
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);
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}
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test "BitmapAllocator alloc and free two 1.5 bitmaps offset 0.75" {
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const Alloc = BitmapAllocator(1);
|
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// Capacity such that we'll have 4 bitmaps.
|
||||
const cap = Alloc.bitmap_bit_size * 4;
|
||||
|
||||
const testing = std.testing;
|
||||
const alloc = testing.allocator;
|
||||
const layout = Alloc.layout(cap);
|
||||
const buf = try alloc.alignedAlloc(u8, Alloc.base_align, layout.total_size);
|
||||
defer alloc.free(buf);
|
||||
|
||||
var bm = Alloc.init(.init(buf), layout);
|
||||
|
||||
// First allocate a 0.75 bitmap
|
||||
const slice = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 4);
|
||||
try testing.expectEqual(3 * Alloc.bitmap_bit_size / 4, slice.len);
|
||||
|
||||
@memset(slice, 0x11);
|
||||
try testing.expectEqualSlices(
|
||||
u8,
|
||||
&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x11)),
|
||||
slice,
|
||||
);
|
||||
|
||||
// Then two 1.5 bitmaps
|
||||
const slice2 = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 2);
|
||||
try testing.expectEqual(3 * Alloc.bitmap_bit_size / 2, slice2.len);
|
||||
|
||||
@memset(slice2, 0x22);
|
||||
try testing.expectEqualSlices(
|
||||
u8,
|
||||
&@as([3 * Alloc.bitmap_bit_size / 2]u8, @splat(0x22)),
|
||||
slice2,
|
||||
);
|
||||
try testing.expectEqualSlices(
|
||||
u8,
|
||||
&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x11)),
|
||||
slice,
|
||||
);
|
||||
|
||||
const slice3 = try bm.alloc(u8, buf, 3 * Alloc.bitmap_bit_size / 2);
|
||||
try testing.expectEqual(3 * Alloc.bitmap_bit_size / 2, slice3.len);
|
||||
|
||||
@memset(slice3, 0x33);
|
||||
try testing.expectEqualSlices(
|
||||
u8,
|
||||
&@as([3 * Alloc.bitmap_bit_size / 2]u8, @splat(0x33)),
|
||||
slice3,
|
||||
);
|
||||
try testing.expectEqualSlices(
|
||||
u8,
|
||||
&@as([3 * Alloc.bitmap_bit_size / 2]u8, @splat(0x22)),
|
||||
slice2,
|
||||
);
|
||||
try testing.expectEqualSlices(
|
||||
u8,
|
||||
&@as([3 * Alloc.bitmap_bit_size / 4]u8, @splat(0x11)),
|
||||
slice,
|
||||
);
|
||||
|
||||
// Free them
|
||||
try testing.expect(bm.isAllocated(buf, slice2));
|
||||
bm.free(buf, slice2);
|
||||
try testing.expect(!bm.isAllocated(buf, slice2));
|
||||
try testing.expect(bm.isAllocated(buf, slice));
|
||||
bm.free(buf, slice);
|
||||
try testing.expect(!bm.isAllocated(buf, slice));
|
||||
try testing.expect(bm.isAllocated(buf, slice3));
|
||||
bm.free(buf, slice3);
|
||||
try testing.expect(!bm.isAllocated(buf, slice3));
|
||||
|
||||
// All of our bitmaps should be free.
|
||||
try testing.expectEqualSlices(
|
||||
u64,
|
||||
&@as([4]u64, @splat(~@as(u64, 0))),
|
||||
bm.bitmap.ptr(buf)[0..4],
|
||||
);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue