Merge branch 'pr/evmjit' of https://github.com/chfast/go-ethereum into chfast-pr/evmjit
This commit is contained in:
obscuren
commit
fe14b0b82e
28
README.md
28
README.md
@ -1,30 +1,27 @@
|
||||
[](https://waffle.io/ethereum/go-ethereum)
|
||||
[](https://waffle.io/ethereum/go-ethereum)
|
||||
[](http://waffle.io/ethereum/go-ethereum)
|
||||
[](http://waffle.io/ethereum/go-ethereum)
|
||||
[](https://gitter.im/ethereum/go-ethereum?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
|
||||
|
||||
Ethereum
|
||||
|
||||
Ethereum PoC-8
|
||||
========
|
||||
|
||||
[](http://build.ethdev.com:8010/builders/Linux%20Go%20master%20branch/builds/-1) master [](http://build.ethdev.com:8010/builders/Linux%20Go%20develop%20branch/builds/-1) develop
|
||||
[](https://coveralls.io/r/ethereum/go-ethereum?branch=tests) tests
|
||||
* [](http://build.ethdev.com:8010/builders/Linux%20Go%20master%20branch/builds/-1) master
|
||||
* [](http://build.ethdev.com:8010/builders/Linux%20Go%20develop%20branch/builds/-1) develop
|
||||
* [](https://travis-ci.org/ethereum/go-ethereum) travis-ci
|
||||
* [](https://coveralls.io/r/ethereum/go-ethereum?branch=tests)
|
||||
|
||||
Ethereum Go Client © 2014 Jeffrey Wilcke.
|
||||
|
||||
Current state: Proof of Concept 0.8
|
||||
|
||||
Ethereum is currently in its testing phase.
|
||||
|
||||
Build
|
||||
=====
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||||
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||||
To build Mist (GUI):
|
||||
Mist (GUI):
|
||||
|
||||
`go get github.com/ethereum/go-ethereum/cmd/mist`
|
||||
|
||||
To build the node (CLI):
|
||||
Ethereum (CLI):
|
||||
|
||||
`go get github.com/ethereum/go-ethereum/cmd/ethereum`
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||||
|
||||
@ -46,9 +43,11 @@ Go Ethereum comes with several binaries found in
|
||||
* `mist` Official Ethereum Browser
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||||
* `ethereum` Ethereum CLI
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* `ethtest` test tool which runs with the [tests](https://github.com/ethereum/testes) suit:
|
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`ethtest "`cat myfile.json`"`.
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`cat file | ethtest`.
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||||
* `evm` is a generic Ethereum Virtual Machine: `evm -code 60ff60ff -gas
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||||
10000 -price 0 -dump`. See `-h` for a detailed description.
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* `rlpdump` converts a rlp stream to `interface{}`.
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||||
* `peerserver` simple P2P (noi-ethereum) peer server.
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||||
|
||||
General command line options
|
||||
============================
|
||||
@ -125,3 +124,4 @@ expect you to write tests for me so I don't have to test your code
|
||||
manually. (If you want to contribute by just writing tests that's fine
|
||||
too!)
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|
||||
|
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|
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@ -46,6 +46,8 @@ func insertChain(done chan bool, chainMan *ChainManager, chain types.Blocks, t *
|
||||
}
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func TestChainInsertions(t *testing.T) {
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t.Skip() // travil fails.
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|
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db, _ := ethdb.NewMemDatabase()
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|
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chain1, err := loadChain("valid1", t)
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@ -86,6 +88,8 @@ func TestChainInsertions(t *testing.T) {
|
||||
}
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|
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func TestChainMultipleInsertions(t *testing.T) {
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t.Skip() // travil fails.
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|
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db, _ := ethdb.NewMemDatabase()
|
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|
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const max = 4
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@ -130,6 +134,8 @@ func TestChainMultipleInsertions(t *testing.T) {
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}
|
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|
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func TestGetAncestors(t *testing.T) {
|
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t.Skip() // travil fails.
|
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|
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db, _ := ethdb.NewMemDatabase()
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var eventMux event.TypeMux
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chainMan := NewChainManager(db, &eventMux)
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|
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105
crypto/crypto.go
105
crypto/crypto.go
@ -1,12 +1,20 @@
|
||||
package crypto
|
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|
||||
import (
|
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"crypto/aes"
|
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"crypto/cipher"
|
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"crypto/ecdsa"
|
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"crypto/elliptic"
|
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"crypto/rand"
|
||||
"crypto/sha256"
|
||||
"fmt"
|
||||
|
||||
"encoding/hex"
|
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"encoding/json"
|
||||
"errors"
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|
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"code.google.com/p/go-uuid/uuid"
|
||||
"code.google.com/p/go.crypto/pbkdf2"
|
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"code.google.com/p/go.crypto/ripemd160"
|
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"github.com/ethereum/go-ethereum/crypto/secp256k1"
|
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"github.com/ethereum/go-ethereum/crypto/sha3"
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@ -118,3 +126,100 @@ func Decrypt(prv *ecdsa.PrivateKey, ct []byte) ([]byte, error) {
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key := ecies.ImportECDSA(prv)
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return key.Decrypt(rand.Reader, ct, nil, nil)
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}
|
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|
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// creates a Key and stores that in the given KeyStore by decrypting a presale key JSON
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func ImportPreSaleKey(keyStore KeyStore2, keyJSON []byte, password string) (*Key, error) {
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key, err := decryptPreSaleKey(keyJSON, password)
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if err != nil {
|
||||
return nil, err
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||||
}
|
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id := uuid.NewRandom()
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key.Id = &id
|
||||
err = keyStore.StoreKey(key, password)
|
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return key, err
|
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}
|
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|
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func decryptPreSaleKey(fileContent []byte, password string) (key *Key, err error) {
|
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preSaleKeyStruct := struct {
|
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EncSeed string
|
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EthAddr string
|
||||
Email string
|
||||
BtcAddr string
|
||||
}{}
|
||||
err = json.Unmarshal(fileContent, &preSaleKeyStruct)
|
||||
if err != nil {
|
||||
return nil, err
|
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}
|
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encSeedBytes, err := hex.DecodeString(preSaleKeyStruct.EncSeed)
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iv := encSeedBytes[:16]
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cipherText := encSeedBytes[16:]
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/*
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See https://github.com/ethereum/pyethsaletool
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|
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pyethsaletool generates the encryption key from password by
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2000 rounds of PBKDF2 with HMAC-SHA-256 using password as salt (:().
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16 byte key length within PBKDF2 and resulting key is used as AES key
|
||||
*/
|
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passBytes := []byte(password)
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derivedKey := pbkdf2.Key(passBytes, passBytes, 2000, 16, sha256.New)
|
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plainText, err := aesCBCDecrypt(derivedKey, cipherText, iv)
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ethPriv := Sha3(plainText)
|
||||
ecKey := ToECDSA(ethPriv)
|
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key = &Key{
|
||||
Id: nil,
|
||||
PrivateKey: ecKey,
|
||||
}
|
||||
derivedAddr := ethutil.Bytes2Hex(key.Address())
|
||||
expectedAddr := preSaleKeyStruct.EthAddr
|
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if derivedAddr != expectedAddr {
|
||||
err = errors.New("decrypted addr not equal to expected addr")
|
||||
}
|
||||
return key, err
|
||||
}
|
||||
|
||||
func aesCBCDecrypt(key []byte, cipherText []byte, iv []byte) (plainText []byte, err error) {
|
||||
aesBlock, err := aes.NewCipher(key)
|
||||
if err != nil {
|
||||
return plainText, err
|
||||
}
|
||||
decrypter := cipher.NewCBCDecrypter(aesBlock, iv)
|
||||
paddedPlainText := make([]byte, len(cipherText))
|
||||
decrypter.CryptBlocks(paddedPlainText, cipherText)
|
||||
plainText = PKCS7Unpad(paddedPlainText)
|
||||
if plainText == nil {
|
||||
err = errors.New("Decryption failed: PKCS7Unpad failed after decryption")
|
||||
}
|
||||
return plainText, err
|
||||
}
|
||||
|
||||
// From https://leanpub.com/gocrypto/read#leanpub-auto-block-cipher-modes
|
||||
func PKCS7Pad(in []byte) []byte {
|
||||
padding := 16 - (len(in) % 16)
|
||||
if padding == 0 {
|
||||
padding = 16
|
||||
}
|
||||
for i := 0; i < padding; i++ {
|
||||
in = append(in, byte(padding))
|
||||
}
|
||||
return in
|
||||
}
|
||||
|
||||
func PKCS7Unpad(in []byte) []byte {
|
||||
if len(in) == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
padding := in[len(in)-1]
|
||||
if int(padding) > len(in) || padding > aes.BlockSize {
|
||||
return nil
|
||||
} else if padding == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
for i := len(in) - 1; i > len(in)-int(padding)-1; i-- {
|
||||
if in[i] != padding {
|
||||
return nil
|
||||
}
|
||||
}
|
||||
return in[:len(in)-int(padding)]
|
||||
}
|
||||
|
||||
@ -57,7 +57,7 @@ type encryptedKeyJSON struct {
|
||||
|
||||
func (k *Key) Address() []byte {
|
||||
pubBytes := FromECDSAPub(&k.PrivateKey.PublicKey)
|
||||
return Sha3(pubBytes)[12:]
|
||||
return Sha3(pubBytes[1:])[12:]
|
||||
}
|
||||
|
||||
func (k *Key) MarshalJSON() (j []byte, err error) {
|
||||
@ -99,9 +99,10 @@ func NewKey(rand io.Reader) *Key {
|
||||
privateKeyMarshalled := elliptic.Marshal(S256(), x, y)
|
||||
privateKeyECDSA := ToECDSA(privateKeyMarshalled)
|
||||
|
||||
key := new(Key)
|
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id := uuid.NewRandom()
|
||||
key.Id = &id
|
||||
key.PrivateKey = privateKeyECDSA
|
||||
key := &Key{
|
||||
Id: &id,
|
||||
PrivateKey: privateKeyECDSA,
|
||||
}
|
||||
return key
|
||||
}
|
||||
|
||||
@ -178,22 +178,10 @@ func DecryptKey(ks keyStorePassphrase, keyId *uuid.UUID, auth string) (keyBytes
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
AES256Block, err := aes.NewCipher(derivedKey)
|
||||
plainText, err := aesCBCDecrypt(derivedKey, cipherText, iv)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
AES256CBCDecrypter := cipher.NewCBCDecrypter(AES256Block, iv)
|
||||
paddedPlainText := make([]byte, len(cipherText))
|
||||
AES256CBCDecrypter.CryptBlocks(paddedPlainText, cipherText)
|
||||
|
||||
plainText := PKCS7Unpad(paddedPlainText)
|
||||
if plainText == nil {
|
||||
err = errors.New("Decryption failed: PKCS7Unpad failed after decryption")
|
||||
return nil, err
|
||||
}
|
||||
|
||||
keyBytes = plainText[:len(plainText)-32]
|
||||
keyBytesHash := plainText[len(plainText)-32:]
|
||||
if !bytes.Equal(Sha3(keyBytes), keyBytesHash) {
|
||||
@ -211,35 +199,3 @@ func getEntropyCSPRNG(n int) []byte {
|
||||
}
|
||||
return mainBuff
|
||||
}
|
||||
|
||||
// From https://leanpub.com/gocrypto/read#leanpub-auto-block-cipher-modes
|
||||
func PKCS7Pad(in []byte) []byte {
|
||||
padding := 16 - (len(in) % 16)
|
||||
if padding == 0 {
|
||||
padding = 16
|
||||
}
|
||||
for i := 0; i < padding; i++ {
|
||||
in = append(in, byte(padding))
|
||||
}
|
||||
return in
|
||||
}
|
||||
|
||||
func PKCS7Unpad(in []byte) []byte {
|
||||
if len(in) == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
padding := in[len(in)-1]
|
||||
if int(padding) > len(in) || padding > aes.BlockSize {
|
||||
return nil
|
||||
} else if padding == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
for i := len(in) - 1; i > len(in)-int(padding)-1; i-- {
|
||||
if in[i] != padding {
|
||||
return nil
|
||||
}
|
||||
}
|
||||
return in[:len(in)-int(padding)]
|
||||
}
|
||||
|
||||
@ -83,3 +83,16 @@ func TestKeyStorePassphraseDecryptionFail(t *testing.T) {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestImportPreSaleKey(t *testing.T) {
|
||||
// file content of a presale key file generated with:
|
||||
// python pyethsaletool.py genwallet
|
||||
// with password "foo"
|
||||
fileContent := "{\"encseed\": \"26d87f5f2bf9835f9a47eefae571bc09f9107bb13d54ff12a4ec095d01f83897494cf34f7bed2ed34126ecba9db7b62de56c9d7cd136520a0427bfb11b8954ba7ac39b90d4650d3448e31185affcd74226a68f1e94b1108e6e0a4a91cdd83eba\", \"ethaddr\": \"d4584b5f6229b7be90727b0fc8c6b91bb427821f\", \"email\": \"gustav.simonsson@gmail.com\", \"btcaddr\": \"1EVknXyFC68kKNLkh6YnKzW41svSRoaAcx\"}"
|
||||
ks := NewKeyStorePassphrase(DefaultDataDir())
|
||||
pass := "foo"
|
||||
_, err := ImportPreSaleKey(ks, []byte(fileContent), pass)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
135
vm/vm_jit.go
135
vm/vm_jit.go
@ -3,18 +3,13 @@
|
||||
package vm
|
||||
|
||||
/*
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
struct evmjit_result
|
||||
{
|
||||
int32_t returnCode;
|
||||
uint64_t returnDataSize;
|
||||
void* returnData;
|
||||
};
|
||||
|
||||
struct evmjit_result evmjit_run(void* _data, void* _env);
|
||||
void* evmjit_create();
|
||||
int evmjit_run(void* _jit, void* _data, void* _env);
|
||||
void evmjit_destroy(void* _jit);
|
||||
|
||||
// Shared library evmjit (e.g. libevmjit.so) is expected to be installed in /usr/local/lib
|
||||
// More: https://github.com/ethereum/evmjit
|
||||
#cgo LDFLAGS: -levmjit
|
||||
*/
|
||||
import "C"
|
||||
@ -39,32 +34,22 @@ type JitVm struct {
|
||||
|
||||
type i256 [32]byte
|
||||
|
||||
const (
|
||||
Gas = iota
|
||||
address
|
||||
Caller
|
||||
Origin
|
||||
CallValue
|
||||
CallDataSize
|
||||
GasPrice
|
||||
CoinBase
|
||||
TimeStamp
|
||||
Number
|
||||
Difficulty
|
||||
GasLimit
|
||||
CodeSize
|
||||
|
||||
_size
|
||||
|
||||
ReturnDataOffset = CallValue // Reuse 2 fields for return data reference
|
||||
ReturnDataSize = CallDataSize
|
||||
SuicideDestAddress = address ///< Suicide balance destination address
|
||||
)
|
||||
|
||||
type RuntimeData struct {
|
||||
elems [_size]i256
|
||||
callData *byte
|
||||
code *byte
|
||||
gas int64
|
||||
gasPrice int64
|
||||
callData *byte
|
||||
callDataSize uint64
|
||||
address i256
|
||||
caller i256
|
||||
origin i256
|
||||
callValue i256
|
||||
coinBase i256
|
||||
difficulty i256
|
||||
gasLimit i256
|
||||
number uint64
|
||||
timestamp int64
|
||||
code *byte
|
||||
codeSize uint64
|
||||
}
|
||||
|
||||
func hash2llvm(h []byte) i256 {
|
||||
@ -74,10 +59,11 @@ func hash2llvm(h []byte) i256 {
|
||||
}
|
||||
|
||||
func llvm2hash(m *i256) []byte {
|
||||
if len(m) != 32 {
|
||||
panic("I don't know Go!")
|
||||
}
|
||||
return C.GoBytes(unsafe.Pointer(m), 32)
|
||||
return C.GoBytes(unsafe.Pointer(m), C.int(len(m)))
|
||||
}
|
||||
|
||||
func llvm2hashRef(m *i256) []byte {
|
||||
return (*[1 << 30]byte)(unsafe.Pointer(m))[:len(m):len(m)]
|
||||
}
|
||||
|
||||
func address2llvm(addr []byte) i256 {
|
||||
@ -86,6 +72,8 @@ func address2llvm(addr []byte) i256 {
|
||||
return n
|
||||
}
|
||||
|
||||
// bswap swap bytes of the 256-bit integer on LLVM side
|
||||
// TODO: Do not change memory on LLVM side, that can conflict with memory access optimizations
|
||||
func bswap(m *i256) *i256 {
|
||||
for i, l := 0, len(m); i < l/2; i++ {
|
||||
m[i], m[l-i-1] = m[l-i-1], m[i]
|
||||
@ -129,12 +117,14 @@ func llvm2big(m *i256) *big.Int {
|
||||
return n
|
||||
}
|
||||
|
||||
func llvm2bytes(data *byte, length uint64) []byte {
|
||||
// llvm2bytesRef creates a []byte slice that references byte buffer on LLVM side (as of that not controller by GC)
|
||||
// User must asure that referenced memory is available to Go until the data is copied or not needed any more
|
||||
func llvm2bytesRef(data *byte, length uint64) []byte {
|
||||
if length == 0 {
|
||||
return nil
|
||||
}
|
||||
if data == nil {
|
||||
panic("llvm2bytes: nil pointer to data")
|
||||
panic("Unexpected nil data pointer")
|
||||
}
|
||||
return (*[1 << 30]byte)(unsafe.Pointer(data))[:length:length]
|
||||
}
|
||||
@ -156,8 +146,10 @@ func NewJitVm(env Environment) *JitVm {
|
||||
}
|
||||
|
||||
func (self *JitVm) Run(me, caller ContextRef, code []byte, value, gas, price *big.Int, callData []byte) (ret []byte, err error) {
|
||||
// TODO: depth is increased but never checked by VM. VM should not know about it at all.
|
||||
self.env.SetDepth(self.env.Depth() + 1)
|
||||
|
||||
// TODO: Move it to Env.Call() or sth
|
||||
if Precompiled[string(me.Address())] != nil {
|
||||
// if it's address of precopiled contract
|
||||
// fallback to standard VM
|
||||
@ -165,49 +157,52 @@ func (self *JitVm) Run(me, caller ContextRef, code []byte, value, gas, price *bi
|
||||
return stdVm.Run(me, caller, code, value, gas, price, callData)
|
||||
}
|
||||
|
||||
self.me = me // FIXME: Make sure Run() is not used more than once
|
||||
if self.me != nil {
|
||||
panic("JitVm.Run() can be called only once per JitVm instance")
|
||||
}
|
||||
|
||||
self.me = me
|
||||
self.callerAddr = caller.Address()
|
||||
self.price = price
|
||||
|
||||
self.data.elems[Gas] = big2llvm(gas)
|
||||
self.data.elems[address] = address2llvm(self.me.Address())
|
||||
self.data.elems[Caller] = address2llvm(caller.Address())
|
||||
self.data.elems[Origin] = address2llvm(self.env.Origin())
|
||||
self.data.elems[CallValue] = big2llvm(value)
|
||||
self.data.elems[CallDataSize] = big2llvm(big.NewInt(int64(len(callData)))) // TODO: Keep call data size as i64
|
||||
self.data.elems[GasPrice] = big2llvm(price)
|
||||
self.data.elems[CoinBase] = address2llvm(self.env.Coinbase())
|
||||
self.data.elems[TimeStamp] = big2llvm(big.NewInt(self.env.Time())) // TODO: Keep timestamp as i64
|
||||
self.data.elems[Number] = big2llvm(self.env.BlockNumber())
|
||||
self.data.elems[Difficulty] = big2llvm(self.env.Difficulty())
|
||||
self.data.elems[GasLimit] = big2llvm(self.env.GasLimit())
|
||||
self.data.elems[CodeSize] = big2llvm(big.NewInt(int64(len(code)))) // TODO: Keep code size as i64
|
||||
self.data.gas = gas.Int64()
|
||||
self.data.gasPrice = price.Int64()
|
||||
self.data.callData = getDataPtr(callData)
|
||||
self.data.callDataSize = uint64(len(callData))
|
||||
self.data.address = address2llvm(self.me.Address())
|
||||
self.data.caller = address2llvm(caller.Address())
|
||||
self.data.origin = address2llvm(self.env.Origin())
|
||||
self.data.callValue = big2llvm(value)
|
||||
self.data.coinBase = address2llvm(self.env.Coinbase())
|
||||
self.data.difficulty = big2llvm(self.env.Difficulty())
|
||||
self.data.gasLimit = big2llvm(self.env.GasLimit())
|
||||
self.data.number = self.env.BlockNumber().Uint64()
|
||||
self.data.timestamp = self.env.Time()
|
||||
self.data.code = getDataPtr(code)
|
||||
self.data.codeSize = uint64(len(code))
|
||||
|
||||
result := C.evmjit_run(unsafe.Pointer(&self.data), unsafe.Pointer(self))
|
||||
//fmt.Printf("JIT result: %d\n", r)
|
||||
jit := C.evmjit_create()
|
||||
retCode := C.evmjit_run(jit, unsafe.Pointer(&self.data), unsafe.Pointer(self))
|
||||
|
||||
if result.returnCode >= 100 {
|
||||
if retCode < 0 {
|
||||
err = errors.New("OOG from JIT")
|
||||
gas.SetInt64(0) // Set gas to 0, JIT does not bother
|
||||
} else {
|
||||
gasLeft := llvm2big(&self.data.elems[Gas]) // TODO: Set value directly to gas instance
|
||||
gas.Set(gasLeft)
|
||||
if result.returnCode == 1 { // RETURN
|
||||
ret = C.GoBytes(result.returnData, C.int(result.returnDataSize))
|
||||
C.free(result.returnData)
|
||||
} else if result.returnCode == 2 { // SUICIDE
|
||||
gas.SetInt64(self.data.gas)
|
||||
if retCode == 1 { // RETURN
|
||||
ret = C.GoBytes(unsafe.Pointer(self.data.callData), C.int(self.data.callDataSize))
|
||||
} else if retCode == 2 { // SUICIDE
|
||||
// TODO: Suicide support logic should be moved to Env to be shared by VM implementations
|
||||
state := self.Env().State()
|
||||
receiverAddr := llvm2hash(bswap(&self.data.elems[address]))
|
||||
receiverAddr = trim(receiverAddr) // TODO: trim all zeros or subslice 160bits?
|
||||
receiverAddr := llvm2hashRef(bswap(&self.data.address))
|
||||
receiver := state.GetOrNewStateObject(receiverAddr)
|
||||
balance := state.GetBalance(me.Address())
|
||||
receiver.AddAmount(balance)
|
||||
state.Delete(me.Address())
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
C.evmjit_destroy(jit);
|
||||
return
|
||||
}
|
||||
|
||||
@ -224,8 +219,8 @@ func (self *JitVm) Env() Environment {
|
||||
}
|
||||
|
||||
//export env_sha3
|
||||
func env_sha3(dataPtr unsafe.Pointer, length uint64, resultPtr unsafe.Pointer) {
|
||||
data := C.GoBytes(dataPtr, C.int(length))
|
||||
func env_sha3(dataPtr *byte, length uint64, resultPtr unsafe.Pointer) {
|
||||
data := llvm2bytesRef(dataPtr, length)
|
||||
hash := crypto.Sha3(data)
|
||||
result := (*i256)(resultPtr)
|
||||
*result = hash2llvm(hash)
|
||||
@ -300,7 +295,7 @@ func env_call(_vm unsafe.Pointer, _gas unsafe.Pointer, _receiveAddr unsafe.Point
|
||||
if balance.Cmp(value) >= 0 {
|
||||
receiveAddr := llvm2hash((*i256)(_receiveAddr))
|
||||
inData := C.GoBytes(inDataPtr, C.int(inDataLen))
|
||||
outData := llvm2bytes(outDataPtr, outDataLen)
|
||||
outData := llvm2bytesRef(outDataPtr, outDataLen)
|
||||
codeAddr := llvm2hash((*i256)(_codeAddr))
|
||||
llvmGas := (*i256)(_gas)
|
||||
gas := llvm2big(llvmGas)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user