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add filter-exports command to automatically remove unused exports

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this removes the need for a manual step in the rust example
This commit is contained in:
Dennis Ranke
2022-01-01 19:02:58 +01:00
parent 6a75988489
commit 26206a312a
8 changed files with 184 additions and 9 deletions
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1
examples/rust/build.sh
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@@ -1,2 +1,3 @@
rustc --target=wasm32-unknown-unknown --crate-type cdylib -C opt-level="z" -C "link-args=--import-memory --initial-memory=262144 -zstack-size=65536" -o tunnel.wasm tunnel.rs && \
uw8 filter-exports tunnel.wasm tunnel.wasm && \
wasm-opt -Oz -o tunnel.wasm tunnel.wasm

6
examples/rust/readme.txt
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@@ -18,8 +18,10 @@ these globals and exports:
They are meant to be used for heap allocations and stack for any
values that are not simple scalars (i32, f32, etc.). Since our
code doesn't actually use any of that, we can just delete them
in a text editor and assemble the code again with wat2wasm.
code doesn't actually use any of that, the globals are only
referenced by the exports and we can remove them using
'uw8 filter-exports' (preferably before running wasm-opt) which
removes all exports except those used by the MicroW8 platform.
This gives us a 216 byte wasm file. Running this through
uw8 pack brings us to the final size of 119 bytes.