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wasm: do not export malloc, calloc, realloc, free

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These functions were exported by accident, because the compiler had no
way of saying these functions shouldn't be exported.

This can be a big code size reduction for small programs. Before:

    $ tinygo build -o test.wasm -target=wasi -no-debug -scheduler=none ./testdata/alias.go && ls -l test.wasm
    -rwxrwxr-x 1 ayke ayke 2947  8 sep 13:47 test.wasm

After:

    $ tinygo build -o test.wasm -target=wasi -no-debug -scheduler=none ./testdata/alias.go && ls -l test.wasm
    -rwxrwxr-x 1 ayke ayke 968  8 sep 13:47 test.wasm

This is all because the GC isn't needed anymore.

This commit also adds support for using //go:wasm-module to set the
module name of an exported function (the default remains env).
This commit is contained in:
Ayke van Laethem
2022-09-08 13:44:48 +02:00
parent 03d1c44265
commit 7e7814a087
4 changed files with 21 additions and 26 deletions
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compiler/testdata/pragma.ll
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+2 -2
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@@ -62,7 +62,7 @@ declare void @main.undefinedFunctionNotInSection(i8*) #0
attributes #0 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
attributes #1 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "wasm-export-name"="extern_func" "wasm-import-module"="env" "wasm-import-name"="extern_func" }
attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "wasm-export-module"="env" "wasm-export-name"="extern_func" "wasm-import-module"="env" "wasm-import-name"="extern_func" }
attributes #3 = { inlinehint nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
attributes #4 = { noinline nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
attributes #5 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "wasm-export-name"="exportedFunctionInSection" "wasm-import-module"="env" "wasm-import-name"="exportedFunctionInSection" }
attributes #5 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "wasm-export-module"="env" "wasm-export-name"="exportedFunctionInSection" "wasm-import-module"="env" "wasm-import-name"="exportedFunctionInSection" }