forked from orsinium-forks/wasman
/
instance_exec.go
118 lines (103 loc) · 2.89 KB
/
instance_exec.go
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package wasm
import (
"bytes"
"errors"
"fmt"
"github.com/hybridgroup/wasman/expr"
"github.com/hybridgroup/wasman/leb128decode"
"github.com/hybridgroup/wasman/segments"
"github.com/hybridgroup/wasman/types"
"github.com/hybridgroup/wasman/utils"
)
// errors on exec func
var (
ErrExportedFuncNotFound = errors.New("exported func is not found")
ErrFuncIndexOutOfRange = errors.New("function index out of range")
ErrInvalidArgNum = errors.New("invalid number of arguments")
)
func (ins *Instance) execExpr(expression *expr.Expression) (v interface{}, err error) {
r := bytes.NewReader(expression.Data)
switch expression.OpCode {
case expr.OpCodeI32Const:
v, _, err = leb128decode.DecodeInt32(r)
if err != nil {
return nil, fmt.Errorf("read int32: %w", err)
}
case expr.OpCodeI64Const:
v, _, err = leb128decode.DecodeInt64(r)
if err != nil {
return nil, fmt.Errorf("read int64: %w", err)
}
case expr.OpCodeF32Const:
v, err = utils.ReadFloat32(r)
if err != nil {
return nil, fmt.Errorf("read f34: %w", err)
}
case expr.OpCodeF64Const:
v, err = utils.ReadFloat64(r)
if err != nil {
return nil, fmt.Errorf("read f64: %w", err)
}
case expr.OpCodeGlobalGet:
id, _, err := leb128decode.DecodeUint32(r)
if err != nil {
return nil, fmt.Errorf("read index of global: %w", err)
}
if uint32(len(ins.IndexSpace.Globals)) <= id {
return nil, fmt.Errorf("global index out of range")
}
v = ins.IndexSpace.Globals[id].Val
default:
return nil, fmt.Errorf("invalid opt code: %#x", expression.OpCode)
}
return v, nil
}
func (ins *Instance) execFunc() error {
for ; int(ins.Active.PC) < len(ins.Active.Func.body); ins.Active.PC++ {
opByte := ins.Active.Func.body[ins.Active.PC]
op := expr.OpCode(opByte)
err := instructions[op](ins)
if err != nil {
return err
}
// Toll
if ins.Module.ModuleConfig.TollStation != nil {
price := ins.TollStation.GetOpPrice(op)
err := ins.TollStation.AddToll(price)
if err != nil {
return err
}
}
if op == expr.OpCodeReturn {
return nil
}
}
return nil
}
// CallExportedFunc will call the func `name` with the args
// TODO: enhance this
func (ins *Instance) CallExportedFunc(name string, args ...uint64) (returns []uint64, returnTypes []types.ValueType, err error) {
exp, ok := ins.Module.ExportSection[name]
if !ok || exp.Desc.Kind != segments.KindFunction {
return nil, nil, ErrExportedFuncNotFound
}
if int(exp.Desc.Index) >= len(ins.Functions) {
return nil, nil, ErrFuncIndexOutOfRange
}
f := ins.Functions[exp.Desc.Index]
if len(f.getType().InputTypes) != len(args) {
return nil, nil, ErrInvalidArgNum
}
for i := range args {
ins.OperandStack.Push(args[i])
}
err = f.call(ins)
if err != nil {
return nil, nil, err
}
ret := make([]uint64, len(f.getType().ReturnTypes))
for i := range ret {
ret[len(ret)-1-i] = ins.OperandStack.Pop()
}
return ret, f.getType().ReturnTypes, nil
}