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dcode 2019-04-18 13:08:49 +02:00
parent 18c3f0c555
commit 2b0a165e7f
2 changed files with 13 additions and 4 deletions
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3
std/assembly/rt/README.md
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@ -12,6 +12,9 @@ Interface
Dynamically allocates a chunk of memory of at least the specified size and returns its address.
Alignment is guaranteed to be 16 bytes to fit up to v128 values naturally.
* **__rt_reallocate**(ref: `usize`, size: `usize`): `usize`<br />
Dynamically changes the size of a chunk of memory, possibly moving it to a new address.
* **__rt_free**(ref: `usize`): `void`<br />
Frees a dynamically allocated chunk of memory by its address.

14
std/assembly/rt/stub.ts
View File

@ -2,7 +2,7 @@ import { AL_MASK, CommonBlock } from "./common";
// @ts-ignore: decorator
@inline
const BLOCK_OVERHEAD = offsetof<CommonBlock>();
const BLOCK_OVERHEAD = (offsetof<CommonBlock>() + AL_MASK) & ~AL_MASK;
// @ts-ignore: decorator
@inline
@ -43,9 +43,15 @@ function __rt_allocate(size: usize, id: u32): usize {
@unsafe @global
function __rt_reallocate(ref: usize, size: usize): usize {
var block = changetype<CommonBlock>(ref - BLOCK_OVERHEAD);
var newRef = __rt_allocate(size, block.rtId);
memory.copy(newRef, ref, block.rtSize);
return newRef;
var oldSize = <usize>block.rtSize;
if (size > oldSize) {
let newRef = __rt_allocate(size, block.rtId);
memory.copy(newRef, ref, oldSize);
ref = newRef;
} else {
block.rtSize = size;
}
return ref;
}
// @ts-ignore: decorator