From 338b6980915c990c6e6287a7249ddd98e6be20eb Mon Sep 17 00:00:00 2001 From: obscuren Date: Sun, 27 Apr 2014 17:15:44 +0200 Subject: [PATCH] Refactoring and added documentation comments --- ethutil/{parsing.go => asm.go} | 55 ++++++++---------------- ethutil/{parsing_test.go => asm_test.go} | 0 ethutil/big.go | 31 ++++++++----- ethutil/bytes.go | 13 +++++- ethutil/common.go | 12 ++++-- ethutil/config.go | 9 +++- ethutil/rlp.go | 10 ----- 7 files changed, 68 insertions(+), 62 deletions(-) rename ethutil/{parsing.go => asm.go} (80%) rename ethutil/{parsing_test.go => asm_test.go} (100%) diff --git a/ethutil/parsing.go b/ethutil/asm.go similarity index 80% rename from ethutil/parsing.go rename to ethutil/asm.go index 514fd92cd..a547d3ac1 100644 --- a/ethutil/parsing.go +++ b/ethutil/asm.go @@ -79,6 +79,10 @@ var OpCodes = map[string]byte{ "SUICIDE": 0x7f, } +// Is op code +// +// Check whether the given string matches anything in +// the OpCode list func IsOpCode(s string) bool { for key, _ := range OpCodes { if key == s { @@ -88,6 +92,10 @@ func IsOpCode(s string) bool { return false } +// Compile instruction +// +// Attempts to compile and parse the given instruction in "s" +// and returns the byte sequence func CompileInstr(s interface{}) ([]byte, error) { switch s.(type) { case string: @@ -119,8 +127,9 @@ func CompileInstr(s interface{}) ([]byte, error) { return nil, nil } -// Script compilation functions -// Compiles strings to machine code +// Assemble +// +// Assembles the given instructions and returns EVM byte code func Assemble(instructions ...interface{}) (script []byte) { //script = make([]string, len(instructions)) @@ -134,38 +143,22 @@ func Assemble(instructions ...interface{}) (script []byte) { return } -/* -Prepocessing function that takes init and main apart: -init() { - // something -} - -main() { - // main something -} +// Pre process script +// +// Take data apart and attempt to find the "init" section and +// "main" section. `main { } init { }` func PreProcess(data string) (mainInput, initInput string) { - reg := "\\(\\)\\s*{([\\d\\w\\W\\n\\s]+?)}" - mainReg := regexp.MustCompile("main" + reg) - initReg := regexp.MustCompile("init" + reg) - - main := mainReg.FindStringSubmatch(data) - if len(main) > 0 { - mainInput = main[1] - } else { + mainInput = getCodeSectionFor("main", data) + if mainInput == "" { mainInput = data } - - init := initReg.FindStringSubmatch(data) - if len(init) > 0 { - initInput = init[1] - } + initInput = getCodeSectionFor("init", data) return } -*/ // Very, very dumb parser. Heed no attention :-) -func FindFor(blockMatcher, input string) string { +func getCodeSectionFor(blockMatcher, input string) string { curCount := -1 length := len(blockMatcher) matchfst := rune(blockMatcher[0]) @@ -198,13 +191,3 @@ func FindFor(blockMatcher, input string) string { return currStr } - -func PreProcess(data string) (mainInput, initInput string) { - mainInput = FindFor("main", data) - if mainInput == "" { - mainInput = data - } - initInput = FindFor("init", data) - - return -} diff --git a/ethutil/parsing_test.go b/ethutil/asm_test.go similarity index 100% rename from ethutil/parsing_test.go rename to ethutil/asm_test.go diff --git a/ethutil/big.go b/ethutil/big.go index c0488a71f..891d476ad 100644 --- a/ethutil/big.go +++ b/ethutil/big.go @@ -12,7 +12,9 @@ var BigTrue *big.Int = big.NewInt(1) // False var BigFalse *big.Int = big.NewInt(0) -// Returns the power of two integers +// Big pow +// +// Returns the power of two big integers func BigPow(a, b int) *big.Int { c := new(big.Int) c.Exp(big.NewInt(int64(a)), big.NewInt(int64(b)), big.NewInt(0)) @@ -20,7 +22,9 @@ func BigPow(a, b int) *big.Int { return c } -// Like big.NewInt(uint64); this takes a string instead. +// Big +// +// Shortcut for new(big.Int).SetString(..., 0) func Big(num string) *big.Int { n := new(big.Int) n.SetString(num, 0) @@ -28,7 +32,9 @@ func Big(num string) *big.Int { return n } -// Like big.NewInt(uint64); this takes a byte buffer instead. +// BigD +// +// Shortcut for new(big.Int).SetBytes(...) func BigD(data []byte) *big.Int { n := new(big.Int) n.SetBytes(data) @@ -36,21 +42,26 @@ func BigD(data []byte) *big.Int { return n } +// Big to bytes +// +// Returns the bytes of a big integer with the size specified by **base** +// Attempts to pad the byte array with zeros. func BigToBytes(num *big.Int, base int) []byte { ret := make([]byte, base/8) return append(ret[:len(ret)-len(num.Bytes())], num.Bytes()...) } -// Functions like the build in "copy" function -// but works on big integers -func BigCopy(src *big.Int) (ret *big.Int) { - ret = new(big.Int) - ret.Add(ret, src) - - return +// Big copy +// +// Creates a copy of the given big integer +func BigCopy(src *big.Int) *big.Int { + return new(big.Int).Set(src) } +// Big max +// +// Returns the maximum size big integer func BigMax(x, y *big.Int) *big.Int { if x.Cmp(y) <= 0 { return x diff --git a/ethutil/bytes.go b/ethutil/bytes.go index 40903a5f1..957fa254a 100644 --- a/ethutil/bytes.go +++ b/ethutil/bytes.go @@ -6,6 +6,9 @@ import ( "fmt" ) +// Number to bytes +// +// Returns the number in bytes with the specified base func NumberToBytes(num interface{}, bits int) []byte { buf := new(bytes.Buffer) err := binary.Write(buf, binary.BigEndian, num) @@ -16,6 +19,9 @@ func NumberToBytes(num interface{}, bits int) []byte { return buf.Bytes()[buf.Len()-(bits/8):] } +// Bytes to number +// +// Attempts to cast a byte slice to a unsigned integer func BytesToNumber(b []byte) uint64 { var number uint64 @@ -32,7 +38,9 @@ func BytesToNumber(b []byte) uint64 { return number } -// Read variable integer in big endian +// Read variable int +// +// Read a variable length number in big endian byte order func ReadVarint(reader *bytes.Reader) (ret uint64) { if reader.Len() == 8 { var num uint64 @@ -55,6 +63,9 @@ func ReadVarint(reader *bytes.Reader) (ret uint64) { return ret } +// Binary length +// +// Returns the true binary length of the given number func BinaryLength(num int) int { if num == 0 { return 0 diff --git a/ethutil/common.go b/ethutil/common.go index d0ee7b538..983ea5d1b 100644 --- a/ethutil/common.go +++ b/ethutil/common.go @@ -5,16 +5,20 @@ import ( "math/big" ) +// The different number of units var ( Ether = BigPow(10, 18) Finney = BigPow(10, 15) Szabo = BigPow(10, 12) - Vito = BigPow(10, 9) + Vita = BigPow(10, 9) Turing = BigPow(10, 6) Eins = BigPow(10, 3) Wei = big.NewInt(1) ) +// Currency to string +// +// Returns a string representing a human readable format func CurrencyToString(num *big.Int) string { switch { case num.Cmp(Ether) >= 0: @@ -23,8 +27,8 @@ func CurrencyToString(num *big.Int) string { return fmt.Sprintf("%v Finney", new(big.Int).Div(num, Finney)) case num.Cmp(Szabo) >= 0: return fmt.Sprintf("%v Szabo", new(big.Int).Div(num, Szabo)) - case num.Cmp(Vito) >= 0: - return fmt.Sprintf("%v Vito", new(big.Int).Div(num, Vito)) + case num.Cmp(Vita) >= 0: + return fmt.Sprintf("%v Vita", new(big.Int).Div(num, Vita)) case num.Cmp(Turing) >= 0: return fmt.Sprintf("%v Turing", new(big.Int).Div(num, Turing)) case num.Cmp(Eins) >= 0: @@ -34,6 +38,7 @@ func CurrencyToString(num *big.Int) string { return fmt.Sprintf("%v Wei", num) } +// Common big integers often used var ( Big1 = big.NewInt(1) Big2 = big.NewInt(1) @@ -42,6 +47,7 @@ var ( Big256 = big.NewInt(0xff) ) +// Creates an ethereum address given the bytes and the nonce func CreateAddress(b []byte, nonce *big.Int) []byte { addrBytes := append(b, nonce.Bytes()...) diff --git a/ethutil/config.go b/ethutil/config.go index 86c0a855d..323773ba7 100644 --- a/ethutil/config.go +++ b/ethutil/config.go @@ -9,6 +9,7 @@ import ( "runtime" ) +// Log types available type LogType byte const ( @@ -16,7 +17,7 @@ const ( LogTypeFile = 2 ) -// Config struct isn't exposed +// Config struct type config struct { Db Database @@ -31,7 +32,9 @@ type config struct { var Config *config -// Read config doesn't read anything yet. +// Read config +// +// Initialize the global Config variable with default settings func ReadConfig(base string) *config { if Config == nil { usr, _ := user.Current() @@ -56,6 +59,8 @@ func ReadConfig(base string) *config { return Config } +// Set client string +// func (c *config) SetClientString(str string) { Config.ClientString = fmt.Sprintf("%s nv%s/%s", str, c.Ver, runtime.GOOS) } diff --git a/ethutil/rlp.go b/ethutil/rlp.go index d95ace425..69f80a0a6 100644 --- a/ethutil/rlp.go +++ b/ethutil/rlp.go @@ -26,16 +26,6 @@ func (coder *RlpEncoder) EncodeData(rlpData interface{}) []byte { return Encode(rlpData) } -/* -func FromBin(data []byte) uint64 { - if len(data) == 0 { - return 0 - } - - return FromBin(data[:len(data)-1])*256 + uint64(data[len(data)-1]) -} -*/ - const ( RlpEmptyList = 0x80 RlpEmptyStr = 0x40