Stowage/go
2
0
Fork 0
mirror of https://github.com/golang/go.git synced 2025-12-08 06:10:04 +00:00
Code Issues Projects Releases Packages Wiki Activity

all: implement wasmimport directive

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

74
src/cmd/internal/obj/link.go
View file

@ -37,6 +37,7 @@ import (
"cmd/internal/objabi"
"cmd/internal/src"
"cmd/internal/sys"
"encoding/binary"
"fmt"
"sync"
"sync/atomic"
@ -499,7 +500,9 @@ type FuncInfo struct {
WrapInfo *LSym // for wrapper, info of wrapped function
JumpTables []JumpTable
FuncInfoSym *LSym
FuncInfoSym *LSym
WasmImportSym *LSym
WasmImport *WasmImport
}
// JumpTable represents a table used for implementing multi-way
@ -558,6 +561,75 @@ func (s *LSym) File() *FileInfo {
return f
}
// WasmImport represents a WebAssembly (WASM) imported function with
// parameters and results translated into WASM types based on the Go function
// declaration.
type WasmImport struct {
// Module holds the WASM module name specified by the //go:wasmimport
// directive.
Module string
// Name holds the WASM imported function name specified by the
// //go:wasmimport directive.
Name string
// Params holds the imported function parameter fields.
Params []WasmField
// Results holds the imported function result fields.
Results []WasmField
}
func (wi *WasmImport) CreateSym(ctxt *Link) *LSym {
var sym LSym
var b [8]byte
writeByte := func(x byte) {
sym.WriteBytes(ctxt, sym.Size, []byte{x})
}
writeUint32 := func(x uint32) {
binary.LittleEndian.PutUint32(b[:], x)
sym.WriteBytes(ctxt, sym.Size, b[:4])
}
writeInt64 := func(x int64) {
binary.LittleEndian.PutUint64(b[:], uint64(x))
sym.WriteBytes(ctxt, sym.Size, b[:])
}
writeString := func(s string) {
writeUint32(uint32(len(s)))
sym.WriteString(ctxt, sym.Size, len(s), s)
}
writeString(wi.Module)
writeString(wi.Name)
writeUint32(uint32(len(wi.Params)))
for _, f := range wi.Params {
writeByte(byte(f.Type))
writeInt64(f.Offset)
}
writeUint32(uint32(len(wi.Results)))
for _, f := range wi.Results {
writeByte(byte(f.Type))
writeInt64(f.Offset)
}
return &sym
}
type WasmField struct {
Type WasmFieldType
// Offset holds the frame-pointer-relative locations for Go's stack-based
// ABI. This is used by the src/cmd/internal/wasm package to map WASM
// import parameters to the Go stack in a wrapper function.
Offset int64
}
type WasmFieldType byte
const (
WasmI32 WasmFieldType = iota
WasmI64
WasmF32
WasmF64
WasmPtr
)
type InlMark struct {
// When unwinding from an instruction in an inlined body, mark
// where we should unwind to.