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wasm: add //go:wasmexport support (#4451)

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This adds support for the `//go:wasmexport` pragma as proposed here:
https://github.com/golang/go/issues/65199

It is currently implemented only for wasip1 and wasm-unknown, but it is
certainly possible to extend it to other targets like GOOS=js and
wasip2.
This commit is contained in:
Ayke
2024-10-05 00:33:47 +02:00
committed by GitHub
parent 407889864f
commit 9da8b5c786
22 changed files with 765 additions and 67 deletions
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builder/build.go
+10 -2
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@@ -197,6 +197,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
ABI: config.ABI(),
GOOS: config.GOOS(),
GOARCH: config.GOARCH(),
BuildMode: config.BuildMode(),
CodeModel: config.CodeModel(),
RelocationModel: config.RelocationModel(),
SizeLevel: sizeLevel,
@@ -649,6 +650,13 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
result.Binary = result.Executable // final file
ldflags := append(config.LDFlags(), "-o", result.Executable)
if config.Options.BuildMode == "c-shared" {
if !strings.HasPrefix(config.Triple(), "wasm32-") {
return result, fmt.Errorf("buildmode c-shared is only supported on wasm at the moment")
}
ldflags = append(ldflags, "--no-entry")
}
// Add compiler-rt dependency if needed. Usually this is a simple load from
// a cache.
if config.Target.RTLib == "compiler-rt" {
@@ -880,7 +888,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
err := cmd.Run()
if err != nil {
return fmt.Errorf("wasm-tools failed: %w", err)
return fmt.Errorf("`wasm-tools component embed` failed: %w", err)
}
// wasm-tools component new embedded.wasm -o component.wasm
@@ -902,7 +910,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
err = cmd.Run()
if err != nil {
return fmt.Errorf("wasm-tools failed: %w", err)
return fmt.Errorf("`wasm-tools component new` failed: %w", err)
}
}