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all: implement wasmimport directive

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Go programs can now use the //go:wasmimport module_name function_name
directive to import functions from the WebAssembly runtime.

For now, the directive is restricted to the runtime and syscall/js
packages.

* Derived from CL 350737
* Original work modified to work with changes to the IR conversion code.
* Modification of CL 350737 changes to fully exist in Unified IR path (emp)
* Original work modified to work with changes to the ABI configuration code.
* Fixes #38248

Co-authored-by: Vedant Roy <vroy101@gmail.com>
Co-authored-by: Richard Musiol <mail@richard-musiol.de>
Co-authored-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Change-Id: I740719735d91c306ac718a435a78e1ee9686bc16
Reviewed-on: https://go-review.googlesource.com/c/go/+/463018
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Reviewed-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
This commit is contained in:
Evan Phoenix 2023-01-22 15:30:59 -08:00 • committed by Gopher Robot
parent af9f21289f
commit 02411bcd7c
29 changed files with 585 additions and 145 deletions
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23
src/cmd/link/internal/loader/loader.go
View file

@ -1618,6 +1618,29 @@ func (l *Loader) Aux(i Sym, j int) Aux {
return Aux{r.Aux(li, j), r, l}
}
// WasmImportSym returns the auxiliary WebAssembly import symbol associated with
// a given function symbol. The aux sym only exists for Go function stubs that
// have been annotated with the //go:wasmimport directive. The aux sym
// contains the information necessary for the linker to add a WebAssembly
// import statement.
// (https://webassembly.github.io/spec/core/syntax/modules.html#imports)
func (l *Loader) WasmImportSym(fnSymIdx Sym) (Sym, bool) {
if l.SymType(fnSymIdx) != sym.STEXT {
log.Fatalf("error: non-function sym %d/%s t=%s passed to WasmImportSym", fnSymIdx, l.SymName(fnSymIdx), l.SymType(fnSymIdx).String())
}
r, li := l.toLocal(fnSymIdx)
auxs := r.Auxs(li)
for i := range auxs {
a := &auxs[i]
switch a.Type() {
case goobj.AuxWasmImport:
return l.resolve(r, a.Sym()), true
}
}
return 0, false
}
// GetFuncDwarfAuxSyms collects and returns the auxiliary DWARF
// symbols associated with a given function symbol. Prior to the
// introduction of the loader, this was done purely using name