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execution_context.go
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execution_context.go
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/*
* Copyright (C) 2018 The ZeepinChain Authors
* This file is part of The ZeepinChain library.
*
* The ZeepinChain is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ZeepinChain is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ZeepinChain. If not, see <http://www.gnu.org/licenses/>.
*/
package simulator
import (
"io"
"github.com/zeepin/ZeepinChain/embed/simulator/utils"
)
type ExecutionContext struct {
Code []byte
OpReader *utils.VmReader
InstructionPointer int
engine *ExecutionEngine
}
func NewExecutionContext(engine *ExecutionEngine, code []byte) *ExecutionContext {
var executionContext ExecutionContext
executionContext.Code = code
executionContext.OpReader = utils.NewVmReader(code)
executionContext.InstructionPointer = 0
executionContext.engine = engine
return &executionContext
}
func (ec *ExecutionContext) GetInstructionPointer() int {
return ec.OpReader.Position()
}
func (ec *ExecutionContext) SetInstructionPointer(offset int64) {
ec.OpReader.Seek(offset, io.SeekStart)
}
func (ec *ExecutionContext) NextInstruction() OpCode {
return OpCode(ec.Code[ec.OpReader.Position()])
}
func (ec *ExecutionContext) Clone() *ExecutionContext {
executionContext := NewExecutionContext(ec.engine, ec.Code)
executionContext.InstructionPointer = ec.InstructionPointer
executionContext.SetInstructionPointer(int64(ec.GetInstructionPointer()))
return executionContext
}