github.com/neatio-net/neatio@v1.7.3-0.20231114194659-f4d7a2226baa/chain/core/vm/memory.go (about)

     1  package vm
     2  
     3  import (
     4  	"fmt"
     5  	"math/big"
     6  
     7  	"github.com/neatio-net/neatio/utilities/common/math"
     8  )
     9  
    10  type Memory struct {
    11  	store       []byte
    12  	lastGasCost uint64
    13  }
    14  
    15  func NewMemory() *Memory {
    16  	return &Memory{}
    17  }
    18  
    19  func (m *Memory) Set(offset, size uint64, value []byte) {
    20  
    21  	if size > 0 {
    22  
    23  		if offset+size > uint64(len(m.store)) {
    24  			panic("invalid memory: store empty")
    25  		}
    26  		copy(m.store[offset:offset+size], value)
    27  	}
    28  }
    29  
    30  func (m *Memory) Set32(offset uint64, val *big.Int) {
    31  
    32  	if offset+32 > uint64(len(m.store)) {
    33  		panic("invalid memory: store empty")
    34  	}
    35  
    36  	copy(m.store[offset:offset+32], []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})
    37  
    38  	math.ReadBits(val, m.store[offset:offset+32])
    39  }
    40  
    41  func (m *Memory) Resize(size uint64) {
    42  	if uint64(m.Len()) < size {
    43  		m.store = append(m.store, make([]byte, size-uint64(m.Len()))...)
    44  	}
    45  }
    46  
    47  func (m *Memory) GetCopy(offset, size int64) (cpy []byte) {
    48  	if size == 0 {
    49  		return nil
    50  	}
    51  
    52  	if len(m.store) > int(offset) {
    53  		cpy = make([]byte, size)
    54  		copy(cpy, m.store[offset:offset+size])
    55  
    56  		return
    57  	}
    58  
    59  	return
    60  }
    61  
    62  func (m *Memory) GetPtr(offset, size int64) []byte {
    63  	if size == 0 {
    64  		return nil
    65  	}
    66  
    67  	if len(m.store) > int(offset) {
    68  		return m.store[offset : offset+size]
    69  	}
    70  
    71  	return nil
    72  }
    73  
    74  func (m *Memory) Len() int {
    75  	return len(m.store)
    76  }
    77  
    78  func (m *Memory) Data() []byte {
    79  	return m.store
    80  }
    81  
    82  func (m *Memory) Print() {
    83  	fmt.Printf("### mem %d bytes ###\n", len(m.store))
    84  	if len(m.store) > 0 {
    85  		addr := 0
    86  		for i := 0; i+32 <= len(m.store); i += 32 {
    87  			fmt.Printf("%03d: % x\n", addr, m.store[i:i+32])
    88  			addr++
    89  		}
    90  	} else {
    91  		fmt.Println("-- empty --")
    92  	}
    93  	fmt.Println("####################")
    94  }