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Make TLSF always align to 8 bytes, see #15

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dcodeIO
2018-03-04 01:30:16 +01:00
parent f754b24819
commit 4257273d42
11 changed files with 2164 additions and 2156 deletions
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17
std/assembly/allocator/tlsf.ts
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@@ -1,4 +1,9 @@
////////////// TLSF (Two-Level Segregate Fit) Memory Allocator ////////////////
/**
* @file Two-Level Segregate Fit Memory Allocator
*
* A general purpose dynamic memory allocator specifically designed to meet real-time requirements.
* Always aligns to 8 bytes.
*/
// ╒══════════════ Block size interpretation (32-bit) ═════════════╕
// 3 2 1
@@ -8,7 +13,7 @@
// └───────────────────────────────────────────────┴─────────╨─────┘
// FL: first level, SL: second level, AL: alignment, SB: small block
const AL_BITS: u32 = sizeof<usize>() == sizeof<u32>() ? 2 : 3;
const AL_BITS: u32 = 3; // always align to 8 bytes
const AL_SIZE: usize = 1 << <usize>AL_BITS;
const AL_MASK: usize = AL_SIZE - 1;
@@ -46,8 +51,6 @@ const LEFT_FREE: usize = 1 << 1;
/** Mask to obtain all tags. */
const TAGS: usize = FREE | LEFT_FREE;
assert(AL_BITS >= 2); // alignment must be large enough to store all tags
/** Block structure. */
@unmanaged
class Block {
@@ -56,7 +59,7 @@ class Block {
info: usize;
/** End offset of the {@link Block#info} field. User data starts here. */
static readonly INFO: usize = sizeof<usize>();
static readonly INFO: usize = (sizeof<usize>() + AL_MASK) & ~AL_MASK;
/** Previous free block, if any. Only valid if free. */
prev: Block | null;
@@ -64,7 +67,7 @@ class Block {
next: Block | null;
/** Minimum size of a block, excluding {@link Block#info}. */
static readonly MIN_SIZE: usize = 3 * sizeof<usize>(); // prev + next + jump
static readonly MIN_SIZE: usize = (3 * sizeof<usize>() + AL_MASK) & ~AL_MASK;// prev + next + jump
/** Maximum size of a used block, excluding {@link Block#info}. */
static readonly MAX_SIZE: usize = 1 << (FL_BITS + SB_BITS);
@@ -445,7 +448,7 @@ export function allocate_memory(size: usize): usize {
root.setHead(fl, sl, null);
}
}
root.addMemory(rootOffset + Root.SIZE, current_memory() << 16);
root.addMemory((rootOffset + Root.SIZE + AL_MASK) & ~AL_MASK, current_memory() << 16);
}
// search for a suitable block