From aa34173f13cb56d01c68682c32c5448b5c59a477 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@users.noreply.github.com>
Date: Thu, 14 Jun 2018 14:10:34 +0200
Subject: common/number: delete unused package (#16983)
This package was meant to hold an improved 256 bit integer library, but
the effort was abandoned in 2015. AFAIK nothing ever used this package.
Time to say goodbye.
---
common/number/int.go | 197 ---------------------------------------------
common/number/uint_test.go | 108 -------------------------
2 files changed, 305 deletions(-)
delete mode 100644 common/number/int.go
delete mode 100644 common/number/uint_test.go
(limited to 'common')
diff --git a/common/number/int.go b/common/number/int.go
deleted file mode 100644
index 0cac94254..000000000
--- a/common/number/int.go
+++ /dev/null
@@ -1,197 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library 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 go-ethereum library 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package number
-
-import (
- "math/big"
-
- "github.com/ethereum/go-ethereum/common"
-)
-
-var (
- tt256 = new(big.Int).Lsh(big.NewInt(1), 256)
- tt256m1 = new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(1))
- tt255 = new(big.Int).Lsh(big.NewInt(1), 255)
-)
-
-func limitUnsigned256(x *Number) *Number {
- x.num.And(x.num, tt256m1)
- return x
-}
-
-func limitSigned256(x *Number) *Number {
- if x.num.Cmp(tt255) < 0 {
- return x
- }
- x.num.Sub(x.num, tt256)
- return x
-}
-
-// Initialiser is a Number function
-type Initialiser func(n int64) *Number
-
-// A Number represents a generic integer with a bounding function limiter. Limit is called after each operations
-// to give "fake" bounded integers. New types of Number can be created through NewInitialiser returning a lambda
-// with the new Initialiser.
-type Number struct {
- num *big.Int
- limit func(n *Number) *Number
-}
-
-// NewInitialiser returns a new initialiser for a new *Number without having to expose certain fields
-func NewInitialiser(limiter func(*Number) *Number) Initialiser {
- return func(n int64) *Number {
- return &Number{big.NewInt(n), limiter}
- }
-}
-
-// Uint256 returns a Number with a UNSIGNED limiter up to 256 bits
-func Uint256(n int64) *Number {
- return &Number{big.NewInt(n), limitUnsigned256}
-}
-
-// Int256 returns Number with a SIGNED limiter up to 256 bits
-func Int256(n int64) *Number {
- return &Number{big.NewInt(n), limitSigned256}
-}
-
-// Big returns a Number with a SIGNED unlimited size
-func Big(n int64) *Number {
- return &Number{big.NewInt(n), func(x *Number) *Number { return x }}
-}
-
-// Add sets i to sum of x+y
-func (i *Number) Add(x, y *Number) *Number {
- i.num.Add(x.num, y.num)
- return i.limit(i)
-}
-
-// Sub sets i to difference of x-y
-func (i *Number) Sub(x, y *Number) *Number {
- i.num.Sub(x.num, y.num)
- return i.limit(i)
-}
-
-// Mul sets i to product of x*y
-func (i *Number) Mul(x, y *Number) *Number {
- i.num.Mul(x.num, y.num)
- return i.limit(i)
-}
-
-// Div sets i to the quotient prodject of x/y
-func (i *Number) Div(x, y *Number) *Number {
- i.num.Div(x.num, y.num)
- return i.limit(i)
-}
-
-// Mod sets i to x % y
-func (i *Number) Mod(x, y *Number) *Number {
- i.num.Mod(x.num, y.num)
- return i.limit(i)
-}
-
-// Lsh sets i to x << s
-func (i *Number) Lsh(x *Number, s uint) *Number {
- i.num.Lsh(x.num, s)
- return i.limit(i)
-}
-
-// Pow sets i to x^y
-func (i *Number) Pow(x, y *Number) *Number {
- i.num.Exp(x.num, y.num, big.NewInt(0))
- return i.limit(i)
-}
-
-// Setters
-
-// Set sets x to i
-func (i *Number) Set(x *Number) *Number {
- i.num.Set(x.num)
- return i.limit(i)
-}
-
-// SetBytes sets x bytes to i
-func (i *Number) SetBytes(x []byte) *Number {
- i.num.SetBytes(x)
- return i.limit(i)
-}
-
-// Cmp compares x and y and returns:
-//
-// -1 if x < y
-// 0 if x == y
-// +1 if x > y
-func (i *Number) Cmp(x *Number) int {
- return i.num.Cmp(x.num)
-}
-
-// Getters
-
-// String returns the string representation of i
-func (i *Number) String() string {
- return i.num.String()
-}
-
-// Bytes returns the byte representation of i
-func (i *Number) Bytes() []byte {
- return i.num.Bytes()
-}
-
-// Uint64 returns the Uint64 representation of x. If x cannot be represented in an int64, the result is undefined.
-func (i *Number) Uint64() uint64 {
- return i.num.Uint64()
-}
-
-// Int64 returns the int64 representation of x. If x cannot be represented in an int64, the result is undefined.
-func (i *Number) Int64() int64 {
- return i.num.Int64()
-}
-
-// Int256 returns the signed version of i
-func (i *Number) Int256() *Number {
- return Int(0).Set(i)
-}
-
-// Uint256 returns the unsigned version of i
-func (i *Number) Uint256() *Number {
- return Uint(0).Set(i)
-}
-
-// FirstBitSet returns the index of the first bit that's set to 1
-func (i *Number) FirstBitSet() int {
- for j := 0; j < i.num.BitLen(); j++ {
- if i.num.Bit(j) > 0 {
- return j
- }
- }
-
- return i.num.BitLen()
-}
-
-// Variables
-var (
- Zero = Uint(0)
- One = Uint(1)
- Two = Uint(2)
- MaxUint256 = Uint(0).SetBytes(common.Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"))
-
- MinOne = Int(-1)
-
- // "typedefs"
- Uint = Uint256
- Int = Int256
-)
diff --git a/common/number/uint_test.go b/common/number/uint_test.go
deleted file mode 100644
index 3ab9e4c34..000000000
--- a/common/number/uint_test.go
+++ /dev/null
@@ -1,108 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library 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 go-ethereum library 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package number
-
-import (
- "math/big"
- "testing"
-
- "github.com/ethereum/go-ethereum/common"
-)
-
-func TestSet(t *testing.T) {
- a := Uint(0)
- b := Uint(10)
- a.Set(b)
- if a.num.Cmp(b.num) != 0 {
- t.Error("didn't compare", a, b)
- }
-
- c := Uint(0).SetBytes(common.Hex2Bytes("0a"))
- if c.num.Cmp(big.NewInt(10)) != 0 {
- t.Error("c set bytes failed.")
- }
-}
-
-func TestInitialiser(t *testing.T) {
- check := false
- init := NewInitialiser(func(x *Number) *Number {
- check = true
- return x
- })
- a := init(0).Add(init(1), init(2))
- if a.Cmp(init(3)) != 0 {
- t.Error("expected 3. got", a)
- }
- if !check {
- t.Error("expected limiter to be called")
- }
-}
-
-func TestGet(t *testing.T) {
- a := Uint(10)
- if a.Uint64() != 10 {
- t.Error("expected to get 10. got", a.Uint64())
- }
-
- a = Uint(10)
- if a.Int64() != 10 {
- t.Error("expected to get 10. got", a.Int64())
- }
-}
-
-func TestCmp(t *testing.T) {
- a := Uint(10)
- b := Uint(10)
- c := Uint(11)
-
- if a.Cmp(b) != 0 {
- t.Error("a b == 0 failed", a, b)
- }
-
- if a.Cmp(c) >= 0 {
- t.Error("a c < 0 failed", a, c)
- }
-
- if c.Cmp(b) <= 0 {
- t.Error("c b > 0 failed", c, b)
- }
-}
-
-func TestMaxArith(t *testing.T) {
- a := Uint(0).Add(MaxUint256, One)
- if a.Cmp(Zero) != 0 {
- t.Error("expected max256 + 1 = 0 got", a)
- }
-
- a = Uint(0).Sub(Uint(0), One)
- if a.Cmp(MaxUint256) != 0 {
- t.Error("expected 0 - 1 = max256 got", a)
- }
-
- a = Int(0).Sub(Int(0), One)
- if a.Cmp(MinOne) != 0 {
- t.Error("expected 0 - 1 = -1 got", a)
- }
-}
-
-func TestConversion(t *testing.T) {
- a := Int(-1)
- b := a.Uint256()
- if b.Cmp(MaxUint256) != 0 {
- t.Error("expected -1 => unsigned to return max. got", b)
- }
-}
--
cgit v1.2.3