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linker.go
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linker.go
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package wasman
import (
"errors"
"fmt"
"math"
"github.com/hybridgroup/wasman/config"
"github.com/hybridgroup/wasman/utils"
"github.com/hybridgroup/wasman/wasm"
"github.com/hybridgroup/wasman/segments"
"github.com/hybridgroup/wasman/types"
)
// errors on linking modules
var (
ErrInvalidSign = errors.New("invalid signature")
)
// Primitive is a type constraint for arguments and results of host-defined functions
// that can be used with the linker.
type Primitive interface {
int | int8 | int16 | int32 | int64 |
uint | uint8 | uint16 | uint32 | uint64 | uintptr |
float32 | float64
}
// Linker is a helper to instantiate new modules
type Linker struct {
config.LinkerConfig
Modules map[string]*Module // the built-in modules which acts as externs when instantiating coming main module
}
// NewLinker creates a new Linker
func NewLinker(config config.LinkerConfig) *Linker {
return &Linker{
LinkerConfig: config,
Modules: map[string]*Module{},
}
}
// NewLinkerWithModuleMap creates a new Linker with the built-in modules
func NewLinkerWithModuleMap(config config.LinkerConfig, in map[string]*Module) *Linker {
return &Linker{
LinkerConfig: config,
Modules: in,
}
}
// Define put the module on its namespace
func (l *Linker) Define(modName string, mod *Module) {
l.Modules[modName] = mod
}
func DefineFunc(l *Linker, modName, funcName string, f func()) error {
return l.defineFunc(modName, funcName, wrapFunc00(f), []any{}, []any{})
}
func DefineFunc01[Z Primitive](l *Linker, modName, funcName string, f func() Z) error {
return l.defineFunc(modName, funcName, wrapFunc01(f), []any{}, []any{*new(Z)})
}
func DefineFunc02[Y, Z Primitive](l *Linker, modName, funcName string, f func() (Y, Z)) error {
return l.defineFunc(modName, funcName, wrapFunc02(f), []any{}, []any{*new(Y), *new(Z)})
}
func DefineFunc10[A Primitive](l *Linker, modName, funcName string, f func(A)) error {
return l.defineFunc(modName, funcName, wrapFunc10(f), []any{*new(A)}, []any{})
}
func DefineFunc11[A, Z Primitive](l *Linker, modName, funcName string, f func(A) Z) error {
return l.defineFunc(modName, funcName, wrapFunc11(f), []any{*new(A)}, []any{*new(Z)})
}
func DefineFunc12[A, Y, Z Primitive](l *Linker, modName, funcName string, f func(A) (Y, Z)) error {
return l.defineFunc(modName, funcName, wrapFunc12(f), []any{*new(A)}, []any{*new(Y), *new(Z)})
}
func DefineFunc20[A, B Primitive](l *Linker, modName, funcName string, f func(A, B)) error {
return l.defineFunc(modName, funcName, wrapFunc20(f), []any{*new(A), *new(B)}, []any{})
}
func DefineFunc21[A, B, Z Primitive](l *Linker, modName, funcName string, f func(A, B) Z) error {
return l.defineFunc(modName, funcName, wrapFunc21(f), []any{*new(A), *new(B)}, []any{*new(Z)})
}
func DefineFunc22[A, B, Y, Z Primitive](l *Linker, modName, funcName string, f func(A, B) (Y, Z)) error {
return l.defineFunc(modName, funcName, wrapFunc22(f), []any{*new(A), *new(B)}, []any{*new(Y), *new(Z)})
}
func DefineFunc31[A, B, C, Z Primitive](l *Linker, modName, funcName string, f func(A, B, C) Z) error {
return l.defineFunc(modName, funcName, wrapFunc31(f), []any{*new(A), *new(B), *new(C)}, []any{*new(Z)})
}
func DefineFunc32[A, B, C, Y, Z Primitive](l *Linker, modName, funcName string, f func(A, B, C) (Y, Z)) error {
return l.defineFunc(modName, funcName, wrapFunc32(f), []any{*new(A), *new(B), *new(C)}, []any{*new(Y), *new(Z)})
}
func (l *Linker) defineFunc(modName, funcName string, f wasm.RawHostFunc, ins []any, outs []any) error {
var err error
sig := &types.FuncType{}
sig.InputTypes, err = getTypesOf(ins)
if err != nil {
return err
}
sig.ReturnTypes, err = getTypesOf(outs)
if err != nil {
return err
}
return l.DefineRawHostFunc(modName, funcName, sig, f)
}
// DefineRawHostFunc puts a simple raw func into Linker's modules.
func (l *Linker) DefineRawHostFunc(
modName, funcName string, sig *types.FuncType, f wasm.RawHostFunc,
) error {
mod, exists := l.Modules[modName]
if !exists {
mod = &Module{IndexSpace: new(wasm.IndexSpace), ExportSection: map[string]*segments.ExportSegment{}}
l.Modules[modName] = mod
}
if l.DisableShadowing && mod.ExportSection[funcName] != nil {
return config.ErrShadowing
}
mod.ExportSection[funcName] = &segments.ExportSegment{
Name: funcName,
Desc: &segments.ExportDesc{
Kind: segments.KindFunction,
Index: uint32(len(mod.IndexSpace.Functions)),
},
}
mod.IndexSpace.Functions = append(mod.IndexSpace.Functions, &wasm.HostFunc{
Generator: func(_ *Instance) wasm.RawHostFunc {
return f
},
Signature: sig,
})
return nil
}
func DefineGlobal[T any](l *Linker, modName, globalName string, global T) error {
ty, err := getTypeOf(*new(T))
if err != nil {
return err
}
return l.defineGlobal(modName, globalName, ty, global)
}
// DefineGlobal will defined an external global for the main module
func (l *Linker) defineGlobal(modName, globalName string, ty types.ValueType, global any) error {
mod, exists := l.Modules[modName]
if !exists {
mod = &Module{IndexSpace: new(wasm.IndexSpace), ExportSection: map[string]*segments.ExportSegment{}}
l.Modules[modName] = mod
}
if l.DisableShadowing && mod.ExportSection[globalName] != nil {
return config.ErrShadowing
}
mod.ExportSection[globalName] = &segments.ExportSegment{
Name: globalName,
Desc: &segments.ExportDesc{
Kind: segments.KindGlobal,
Index: uint32(len(mod.IndexSpace.Globals)),
},
}
mod.IndexSpace.Globals = append(mod.IndexSpace.Globals, &wasm.Global{
GlobalType: &types.GlobalType{
ValType: ty,
Mutable: true,
},
Val: global,
})
return nil
}
// DefineTable will defined an external table for the main module
func (l *Linker) DefineTable(modName, tableName string, table []*uint32) error {
mod, exists := l.Modules[modName]
if !exists {
mod = &Module{IndexSpace: new(wasm.IndexSpace), ExportSection: map[string]*segments.ExportSegment{}}
l.Modules[modName] = mod
}
if l.DisableShadowing && mod.ExportSection[tableName] != nil {
return config.ErrShadowing
}
mod.ExportSection[tableName] = &segments.ExportSegment{
Name: tableName,
Desc: &segments.ExportDesc{
Kind: segments.KindTable,
Index: uint32(len(mod.IndexSpace.Tables)),
},
}
mod.IndexSpace.Tables = append(mod.IndexSpace.Tables, &wasm.Table{
TableType: *mod.TableSection[0],
Value: table,
})
return nil
}
// DefineMemory will defined an external memory for the main module
func (l *Linker) DefineMemory(modName, memName string, mem []byte) error {
mod, exists := l.Modules[modName]
if !exists {
mod = &Module{IndexSpace: new(wasm.IndexSpace), ExportSection: map[string]*segments.ExportSegment{}}
l.Modules[modName] = mod
}
if l.DisableShadowing && mod.ExportSection[memName] != nil {
return config.ErrShadowing
}
mod.ExportSection[memName] = &segments.ExportSegment{
Name: memName,
Desc: &segments.ExportDesc{
Kind: segments.KindMem,
Index: uint32(len(mod.IndexSpace.Memories)),
},
}
mod.IndexSpace.Memories = append(mod.IndexSpace.Memories, &wasm.Memory{
MemoryType: types.MemoryType{Min: 1, Max: utils.Uint32Ptr(config.DefaultMemoryMaxPages)},
External: true,
Value: mem,
})
return nil
}
// Instantiate will instantiate a Module into an runnable Instance
func (l *Linker) Instantiate(mainModule *Module) (*Instance, error) {
return NewInstance(mainModule, l.Modules)
}
func getTypesOf(defaults []any) ([]types.ValueType, error) {
var err error
types := make([]types.ValueType, len(defaults))
for i, def := range defaults {
types[i], err = getTypeOf(def)
if err != nil {
return nil, err
}
}
return types, nil
}
// getTypeOf converts the go type into wasm val type
func getTypeOf(def any) (types.ValueType, error) {
switch def.(type) {
case float64:
return types.ValueTypeF64, nil
case float32:
return types.ValueTypeF32, nil
case int32, uint32, int, int16, int8, bool:
return types.ValueTypeI32, nil
case int64, uint64, uintptr, uint:
return types.ValueTypeI64, nil
default:
return 0x00, fmt.Errorf("invalid type: %T", def)
}
}
func wrapFunc00(f func()) wasm.RawHostFunc {
wrapper := func([]uint64) []uint64 {
f()
return []uint64{}
}
return wrapper
}
func wrapFunc01[Z Primitive](f func() Z) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
r1 := f()
return []uint64{toU(r1)}
}
return wrapper
}
func wrapFunc02[Y, Z Primitive](f func() (Y, Z)) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
r1, r2 := f()
return []uint64{toU(r1), toU(r2)}
}
return wrapper
}
func wrapFunc10[A Primitive](f func(A)) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
a1 := fromU[A](a[0])
f(a1)
return []uint64{}
}
return wrapper
}
func wrapFunc11[A, Z Primitive](f func(A) Z) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
a1 := fromU[A](a[0])
r1 := f(a1)
return []uint64{toU(r1)}
}
return wrapper
}
func wrapFunc12[A, Y, Z Primitive](f func(A) (Y, Z)) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
a1 := fromU[A](a[0])
r1, r2 := f(a1)
return []uint64{toU(r1), toU(r2)}
}
return wrapper
}
func wrapFunc20[A, B Primitive](f func(A, B)) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
a1 := fromU[A](a[0])
a2 := fromU[B](a[1])
f(a1, a2)
return []uint64{}
}
return wrapper
}
func wrapFunc21[A, B, Z Primitive](f func(A, B) Z) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
a1 := fromU[A](a[0])
a2 := fromU[B](a[1])
r1 := f(a1, a2)
return []uint64{toU(r1)}
}
return wrapper
}
func wrapFunc22[A, B, Y, Z Primitive](f func(A, B) (Y, Z)) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
a1 := fromU[A](a[0])
a2 := fromU[B](a[1])
r1, r2 := f(a1, a2)
return []uint64{toU(r1), toU(r2)}
}
return wrapper
}
func wrapFunc31[A, B, C, Z Primitive](f func(A, B, C) Z) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
a1 := fromU[A](a[0])
a2 := fromU[B](a[1])
a3 := fromU[C](a[2])
r1 := f(a1, a2, a3)
return []uint64{toU(r1)}
}
return wrapper
}
func wrapFunc32[A, B, C, Y, Z Primitive](f func(A, B, C) (Y, Z)) wasm.RawHostFunc {
wrapper := func(a []uint64) []uint64 {
a1 := fromU[A](a[0])
a2 := fromU[B](a[1])
a3 := fromU[C](a[2])
r1, r2 := f(a1, a2, a3)
return []uint64{toU(r1), toU(r2)}
}
return wrapper
}
func fromU[T Primitive](val uint64) T {
switch any(*new(T)).(type) {
case float32:
return T(float32(math.Float64frombits(val)))
case float64:
return T(math.Float64frombits(val))
default:
return T(val)
}
}
func toU[T Primitive](val T) uint64 {
switch v := any(val).(type) {
case float32:
return math.Float64bits(float64(v))
case float64:
return math.Float64bits(v)
default:
return uint64(val)
}
}