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1cf6e31f0d
This CL adds a compiler directive go:wasmexport, which applies to a Go function and makes it an exported function of the Wasm module being built, so it can be called directly from the host. As proposed in #65199, parameter and result types are limited to 32-bit and 64-bit integers and floats, and there can be at most one result. As the Go and Wasm calling conventions are different, for a wasmexport function we generate a wrapper function does the ABI conversion at compile time. Currently this CL only adds basic support. In particular, - it only supports executable mode, i.e. the Go wasm module calls into the host via wasmimport, which then calls back to Go via wasmexport. Library (c-shared) mode is not implemented yet. - only supports wasip1, not js. - if the exported function unwinds stacks (goroutine switch, stack growth, etc.), it probably doesn't work. TODO: support stack unwinding, c-shared mode, js. For #65199. Change-Id: Id1777c2d44f7d51942c1caed3173c0a82f120cc4 Reviewed-on: https://go-review.googlesource.com/c/go/+/603055 Reviewed-by: Than McIntosh <thanm@golang.org> Reviewed-by: Randy Reddig <randy.reddig@fastly.com> Reviewed-by: David Chase <drchase@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
20 lines
390 B
Go
20 lines
390 B
Go
// errorcheck
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// Copyright 2024 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Verify that misplaced directives are diagnosed.
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//go:build wasm
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package p
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//go:wasmexport F
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func F() {} // OK
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type S int32
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//go:wasmexport M
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func (S) M() {} // ERROR "cannot use //go:wasmexport on a method"
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