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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/compiler.go
+4 -3
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@@ -1059,11 +1059,12 @@ func (b *builder) createFunctionStart(intrinsic bool) {
if b.info.section != "" {
b.llvmFn.SetSection(b.info.section)
}
if b.info.exported && strings.HasPrefix(b.Triple, "wasm") {
if b.info.exported && b.info.module != "" && strings.HasPrefix(b.Triple, "wasm") {
// Set the exported name. This is necessary for WebAssembly because
// otherwise the function is not exported.
functionAttr := b.ctx.CreateStringAttribute("wasm-export-name", b.info.linkName)
b.llvmFn.AddFunctionAttr(functionAttr)
b.llvmFn.AddFunctionAttr(b.ctx.CreateStringAttribute("wasm-export-name", b.info.linkName))
// Set the export module.
b.llvmFn.AddFunctionAttr(b.ctx.CreateStringAttribute("wasm-export-module", b.info.module))
}
// Some functions have a pragma controlling the inlining level.