From 8589f46fe07998bd3b27a0cebce2f428e68014e0 Mon Sep 17 00:00:00 2001
From: Richard Musiol <mail@richard-musiol.de>
Date: Thu, 2 Aug 2018 22:39:00 +0200
Subject: [PATCH] cmd/link/internal/wasm: add Go version as a custom wasm
section
The interface between the wasm binary and wasm_exec.js is experimental
and likely to change in the future. Still, there are some early adopters
who experiment with non-web wasm runtimes. They can't use wasm_exec.js
and have to provide their own equivalent. Adding the Go version as a
custom wasm sections allows for them to support a stable Go version and
the latest devel at the same time.
Change-Id: I6d377bb0a0c33cb80e86dd15a34ddc9a70680227
Reviewed-on: https://go-review.googlesource.com/127597
Run-TryBot: Richard Musiol <neelance@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
---
src/cmd/link/internal/wasm/asm.go | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/cmd/link/internal/wasm/asm.go b/src/cmd/link/internal/wasm/asm.go
index 7cc6bef6b78..bffbc7c8a67 100644
--- a/src/cmd/link/internal/wasm/asm.go
+++ b/src/cmd/link/internal/wasm/asm.go
@@ -11,6 +11,7 @@ import (
"cmd/link/internal/sym"
"io"
"regexp"
+ "runtime"
)
const (
@@ -172,6 +173,7 @@ func asmb(ctxt *ld.Link) {
writeBuildID(ctxt, buildid)
}
+ writeGoVersion(ctxt)
writeTypeSec(ctxt, types)
writeImportSec(ctxt, hostImports)
writeFunctionSec(ctxt, fns)
@@ -220,6 +222,13 @@ func writeBuildID(ctxt *ld.Link, buildid []byte) {
writeSecSize(ctxt, sizeOffset)
}
+func writeGoVersion(ctxt *ld.Link) {
+ sizeOffset := writeSecHeader(ctxt, sectionCustom)
+ writeName(ctxt.Out, "go.version")
+ ctxt.Out.Write([]byte(runtime.Version()))
+ writeSecSize(ctxt, sizeOffset)
+}
+
// writeTypeSec writes the section that declares all function types
// so they can be referenced by index.
func writeTypeSec(ctxt *ld.Link, types []*wasmFuncType) {
--
GitLab