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Improve link_mem_intrinsics hack

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Previously the `link_mem_intrinsics` hack actually had a runtime
overhead by storing a value into a global location, but it turns out we
can actually use a non-inlined function call as part of the *descriptor*
which requires this to be in the final binary, but we'll end up snip'ing
the value at the end.

All in all this should mean that it's not a zero-overhead solution for
linking these intrinsics! The `#[wasm_bindgen]` attribute already has
other problems if the descriptors don't show up, so that's the least of
our issues!
This commit is contained in:
Alex Crichton
2018-09-24 15:39:55 -07:00
parent d10ca579e4
commit b256b98e38
3 changed files with 5 additions and 25 deletions
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9
guide/src/examples/add.md
View File

@ -15,11 +15,11 @@ Currently this code...
{{#include ../../../examples/add/src/lib.rs}}
```
generates a 723 byte wasm binary:
generates a 710 byte wasm binary:
```
$ ls -l add_bg.wasm
-rw-rw-r-- 1 alex alex 723 Sep 19 17:32 add_bg.wasm
-rw-rw-r-- 1 alex alex 710 Sep 19 17:32 add_bg.wasm
```
If you run [wasm-opt], a C++ tool for optimize WebAssembly, you can make it
@ -28,7 +28,7 @@ even smaller too!
```
$ wasm-opt -Os add_bg.wasm -o add.wasm
$ ls -l add.wasm
-rw-rw-r-- 1 alex alex 182 Sep 19 17:33 add.wasm
-rw-rw-r-- 1 alex alex 172 Sep 19 17:33 add.wasm
```
And sure enough, using the [wasm2wat] tool it's quite small!
@ -38,9 +38,6 @@ $ wasm2wat add.wasm
(module
(type (;0;) (func (param i32 i32) (result i32)))
(func (;0;) (type 0) (param i32 i32) (result i32)
i32.const 1048640
i32.const 0
i32.store
get_local 1
get_local 0
i32.add)