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| author | Evan Phoenix <evan@phx.io> | 2023-01-22 15:30:59 -0800 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2023-03-02 05:28:55 +0000 |
| commit | 02411bcd7c8eda9c694a5755aff0a516d4983952 (patch) | |
| tree | 71106b1c22a459f53d59f68751267a35c4ddf65a /src/cmd/link/internal/loader | |
| parent | af9f21289fff0c513df3a785c97d8ca35e1829b2 (diff) | |
| download | go-02411bcd7c8eda9c694a5755aff0a516d4983952.tar.xz | |
all: implement wasmimport directive
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>
Diffstat (limited to 'src/cmd/link/internal/loader')
| -rw-r--r-- | src/cmd/link/internal/loader/loader.go | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/cmd/link/internal/loader/loader.go b/src/cmd/link/internal/loader/loader.go index e3ee819a9d..fa8c0c6b20 100644 --- a/src/cmd/link/internal/loader/loader.go +++ b/src/cmd/link/internal/loader/loader.go @@ -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 |