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cmd/compile: document go:wasmimport directive

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Fixes #64972

Change-Id: I784a8728afbdef9736681d56f0a79c82a00609d6
GitHub-Last-Rev: bf158dbeaaa495dc258c590c7a21cf9e25e76ee7
GitHub-Pull-Request: golang/go#64991
Reviewed-on: https://go-review.googlesource.com/c/go/+/554455
Reviewed-by: Achille Roussel <achille.roussel@gmail.com>
Reviewed-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
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Mauri de Souza Meneguzzo 2024-01-10 21:15:55 +00:00 committed by Cherry Mui
parent ee4b61a32e
commit d1674cb4c6
1 changed files with 22 additions and 0 deletions
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22
src/cmd/compile/doc.go
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@ -295,5 +295,27 @@ The declaration of lower.f may also have a linkname directive with a
single argument, f. This is optional, but helps alert the reader that
the function is accessed from outside the package.
//go:wasmimport importmodule importname
The //go:wasmimport directive is wasm-only and must be followed by a
function declaration.
It specifies that the function is provided by a wasm module identified
by ``importmodule`` and ``importname``.
//go:wasmimport a_module f
func g()
The types of parameters and return values to the Go function are translated to
Wasm according to the following table:
Go types Wasm types
int32, uint32 i32
int64, uint64 i64
float32 f32
float64 f64
unsafe.Pointer i32
Any other parameter types are disallowed by the compiler.
*/
package main