From 37ece3668538831927b4e65b1d7d1ef98647a130 Mon Sep 17 00:00:00 2001
From: Nicolas Gotchac <ngotchac@gmail.com>
Date: Tue, 21 Mar 2017 13:56:32 +0100
Subject: [PATCH 1/9] Fix Password Dialog forms style issue (#4968)

---
 js/src/modals/PasswordManager/passwordManager.css | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/js/src/modals/PasswordManager/passwordManager.css b/js/src/modals/PasswordManager/passwordManager.css
index f0dfdd93f..f16f4f369 100644
--- a/js/src/modals/PasswordManager/passwordManager.css
+++ b/js/src/modals/PasswordManager/passwordManager.css
@@ -77,7 +77,8 @@
 }
 
 .form {
+  box-sizing: border-box;
   margin-top: 0;
-  padding: 0.75rem 1.5rem 1.5rem 1.5rem;
+  padding: 0.75rem 1.5rem 1.5rem;
   background-color: rgba(255, 255, 255, 0.05);
 }

From 213f61e82602f78601e40bed63934f1328da93bb Mon Sep 17 00:00:00 2001
From: GitLab Build Bot <jaco+gitlab@ethcore.io>
Date: Tue, 21 Mar 2017 13:17:48 +0000
Subject: [PATCH 2/9] [ci skip] js-precompiled 20170321-131503

---
 Cargo.lock      | 2 +-
 js/package.json | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 1543c9e6b..8f6636b45 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1699,7 +1699,7 @@ dependencies = [
 [[package]]
 name = "parity-ui-precompiled"
 version = "1.4.0"
-source = "git+https://github.com/ethcore/js-precompiled.git#7039b5b8e44196718333dc3fcdfcadae2a97c7fd"
+source = "git+https://github.com/ethcore/js-precompiled.git#18fe217afb0c47fc54f9972fe87b8592b330a2e7"
 dependencies = [
  "parity-dapps-glue 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
diff --git a/js/package.json b/js/package.json
index 9d50ebe07..c8de94346 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "parity.js",
-  "version": "1.7.19",
+  "version": "1.7.20",
   "main": "release/index.js",
   "jsnext:main": "src/index.js",
   "author": "Parity Team <admin@parity.io>",

From 9b9cd451d1254e4b5573338155a189cc978ab5c4 Mon Sep 17 00:00:00 2001
From: Nicolas Gotchac <ngotchac@gmail.com>
Date: Tue, 21 Mar 2017 15:36:47 +0100
Subject: [PATCH 3/9] Fix references to api outside of `parity.js` (#4981)

---
 js/src/dapps/registry/Application/application.js | 4 ++--
 js/src/dapps/tokenreg/Accounts/actions.js        | 2 +-
 js/src/dapps/tokenreg/Status/actions.js          | 3 +--
 js/src/dapps/tokenreg/Status/status.js           | 3 +--
 js/src/dapps/tokenreg/Tokens/actions.js          | 3 ++-
 5 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/js/src/dapps/registry/Application/application.js b/js/src/dapps/registry/Application/application.js
index e4f754dd6..33b3662b1 100644
--- a/js/src/dapps/registry/Application/application.js
+++ b/js/src/dapps/registry/Application/application.js
@@ -23,6 +23,7 @@ import CircularProgress from 'material-ui/CircularProgress';
 import { Card, CardText } from 'material-ui/Card';
 
 import { nullableProptype } from '~/util/proptypes';
+import { api } from '../parity';
 
 import styles from './application.css';
 import Accounts from '../Accounts';
@@ -39,7 +40,7 @@ export default class Application extends Component {
   };
 
   getChildContext () {
-    return { muiTheme, api: window.parity.api };
+    return { muiTheme, api };
   }
 
   static propTypes = {
@@ -49,7 +50,6 @@ export default class Application extends Component {
   };
 
   render () {
-    const { api } = window.parity;
     const { contract, fee } = this.props;
     let warning = null;
 
diff --git a/js/src/dapps/tokenreg/Accounts/actions.js b/js/src/dapps/tokenreg/Accounts/actions.js
index e561334c9..538f1a831 100644
--- a/js/src/dapps/tokenreg/Accounts/actions.js
+++ b/js/src/dapps/tokenreg/Accounts/actions.js
@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-const { api } = window.parity;
+import { api } from '../parity';
 
 export const SET_ACCOUNTS = 'SET_ACCOUNTS';
 export const setAccounts = (accounts) => ({
diff --git a/js/src/dapps/tokenreg/Status/actions.js b/js/src/dapps/tokenreg/Status/actions.js
index 9d789ca34..deb473d9b 100644
--- a/js/src/dapps/tokenreg/Status/actions.js
+++ b/js/src/dapps/tokenreg/Status/actions.js
@@ -17,8 +17,7 @@
 import Contracts from '~/contracts';
 
 import { loadToken, setTokenPending, deleteToken, setTokenData } from '../Tokens/actions';
-
-const { api } = window.parity;
+import { api } from '../parity';
 
 export const SET_LOADING = 'SET_LOADING';
 export const setLoading = (isLoading) => ({
diff --git a/js/src/dapps/tokenreg/Status/status.js b/js/src/dapps/tokenreg/Status/status.js
index db007318f..6f77f386b 100644
--- a/js/src/dapps/tokenreg/Status/status.js
+++ b/js/src/dapps/tokenreg/Status/status.js
@@ -16,12 +16,11 @@
 
 import React, { Component, PropTypes } from 'react';
 
+import { api } from '../parity';
 import Chip from '../Chip';
 
 import styles from './status.css';
 
-const { api } = window.parity;
-
 export default class Status extends Component {
   static propTypes = {
     address: PropTypes.string.isRequired,
diff --git a/js/src/dapps/tokenreg/Tokens/actions.js b/js/src/dapps/tokenreg/Tokens/actions.js
index 6b7983b0d..57581e651 100644
--- a/js/src/dapps/tokenreg/Tokens/actions.js
+++ b/js/src/dapps/tokenreg/Tokens/actions.js
@@ -16,8 +16,9 @@
 
 import { URL_TYPE } from '../Inputs/validation';
 import { getTokenTotalSupply, urlToHash } from '../utils';
+import { api } from '../parity';
 
-const { bytesToHex } = window.parity.api.util;
+const { bytesToHex } = api.util;
 
 export const SET_TOKENS_LOADING = 'SET_TOKENS_LOADING';
 export const setTokensLoading = (isLoading) => ({

From 1a6f23ad2bfaf135628a525c02f1b82601be8407 Mon Sep 17 00:00:00 2001
From: GitLab Build Bot <jaco+gitlab@ethcore.io>
Date: Tue, 21 Mar 2017 14:58:06 +0000
Subject: [PATCH 4/9] [ci skip] js-precompiled 20170321-145513

---
 Cargo.lock      | 2 +-
 js/package.json | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 8f6636b45..014704746 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1699,7 +1699,7 @@ dependencies = [
 [[package]]
 name = "parity-ui-precompiled"
 version = "1.4.0"
-source = "git+https://github.com/ethcore/js-precompiled.git#18fe217afb0c47fc54f9972fe87b8592b330a2e7"
+source = "git+https://github.com/ethcore/js-precompiled.git#5bb0ae216eec333a00d6fac3e5f6b253ca5be9c0"
 dependencies = [
  "parity-dapps-glue 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
diff --git a/js/package.json b/js/package.json
index c8de94346..ac6513014 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "parity.js",
-  "version": "1.7.20",
+  "version": "1.7.21",
   "main": "release/index.js",
   "jsnext:main": "src/index.js",
   "author": "Parity Team <admin@parity.io>",

From cb881108c3e085fb6d1bfc9b6cec23cd672d429b Mon Sep 17 00:00:00 2001
From: Jaco Greeff <jacogr@gmail.com>
Date: Tue, 21 Mar 2017 16:58:52 +0100
Subject: [PATCH 5/9] eth_sign where account === undefined (#4964)

* Update for case where account === undefined

* Update tests to not mask account === undefined

* default account = {} where undefined (thanks @tomusdrw)
---
 .../transactionPendingFormConfirm.js                | 13 ++++++++-----
 .../transactionPendingFormConfirm.spec.js           |  6 +++++-
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/js/src/views/Signer/components/TransactionPendingForm/TransactionPendingFormConfirm/transactionPendingFormConfirm.js b/js/src/views/Signer/components/TransactionPendingForm/TransactionPendingFormConfirm/transactionPendingFormConfirm.js
index 13bf27876..8a20b3332 100644
--- a/js/src/views/Signer/components/TransactionPendingForm/TransactionPendingFormConfirm/transactionPendingFormConfirm.js
+++ b/js/src/views/Signer/components/TransactionPendingForm/TransactionPendingFormConfirm/transactionPendingFormConfirm.js
@@ -27,7 +27,7 @@ import styles from './transactionPendingFormConfirm.css';
 
 export default class TransactionPendingFormConfirm extends Component {
   static propTypes = {
-    account: PropTypes.object.isRequired,
+    account: PropTypes.object,
     address: PropTypes.string.isRequired,
     disabled: PropTypes.bool,
     isSending: PropTypes.bool.isRequired,
@@ -36,6 +36,7 @@ export default class TransactionPendingFormConfirm extends Component {
   };
 
   static defaultProps = {
+    account: {},
     focus: false
   };
 
@@ -80,7 +81,7 @@ export default class TransactionPendingFormConfirm extends Component {
 
   getPasswordHint () {
     const { account } = this.props;
-    const accountHint = account && account.meta && account.meta.passwordHint;
+    const accountHint = account.meta && account.meta.passwordHint;
 
     if (accountHint) {
       return accountHint;
@@ -149,14 +150,16 @@ export default class TransactionPendingFormConfirm extends Component {
     const { account } = this.props;
     const { password } = this.state;
 
-    if (account && account.hardware) {
+    if (account.hardware) {
       return null;
     }
 
+    const isAccount = account.uuid;
+
     return (
       <Input
         hint={
-          account.uuid
+          isAccount
             ? (
               <FormattedMessage
                 id='signer.txPendingConfirm.password.unlock.hint'
@@ -171,7 +174,7 @@ export default class TransactionPendingFormConfirm extends Component {
             )
         }
         label={
-          account.uuid
+          isAccount
             ? (
               <FormattedMessage
                 id='signer.txPendingConfirm.password.unlock.label'
diff --git a/js/src/views/Signer/components/TransactionPendingForm/TransactionPendingFormConfirm/transactionPendingFormConfirm.spec.js b/js/src/views/Signer/components/TransactionPendingForm/TransactionPendingFormConfirm/transactionPendingFormConfirm.spec.js
index 79456c8fd..1176a01f0 100644
--- a/js/src/views/Signer/components/TransactionPendingForm/TransactionPendingFormConfirm/transactionPendingFormConfirm.spec.js
+++ b/js/src/views/Signer/components/TransactionPendingForm/TransactionPendingFormConfirm/transactionPendingFormConfirm.spec.js
@@ -48,7 +48,7 @@ function render (address) {
 
   component = shallow(
     <TransactionPendingFormConfirm
-      account={ ACCOUNTS[address] || {} }
+      account={ ACCOUNTS[address] }
       address={ address }
       onConfirm={ onConfirm }
       isSending={ false }
@@ -130,5 +130,9 @@ describe('views/Signer/TransactionPendingFormConfirm', () => {
     it('renders the password', () => {
       expect(instance.renderPassword()).not.to.be.null;
     });
+
+    it('renders the hint', () => {
+      expect(instance.renderHint()).to.be.null;
+    });
   });
 });

From c7e699223987f0af1c20d40cdaa64d6841a94d77 Mon Sep 17 00:00:00 2001
From: Nicolas Gotchac <ngotchac@gmail.com>
Date: Tue, 21 Mar 2017 17:01:33 +0100
Subject: [PATCH 6/9] Try to fix WS race condition connection (#4976)

* Try to fix wrong token logic

* Linting
---
 js/src/secureApi.js | 43 ++++++++++++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 17 deletions(-)

diff --git a/js/src/secureApi.js b/js/src/secureApi.js
index 60983fce1..9f4a6c078 100644
--- a/js/src/secureApi.js
+++ b/js/src/secureApi.js
@@ -241,7 +241,7 @@ export default class SecureApi extends Api {
     this.transport.updateToken(token, false);
     log.debug('connecting with token', token);
 
-    return this.transport.connect()
+    const connectPromise = this.transport.connect()
       .then(() => {
         log.debug('connected with', token);
 
@@ -258,26 +258,35 @@ export default class SecureApi extends Api {
           log.debug('did not connect ; error', error);
         }
 
-        // Check if the Node is up
-        return this.isNodeUp()
-          .then((isNodeUp) => {
-            // If it's not up, try again in a few...
-            if (!isNodeUp) {
-              const timeout = this.transport.retryTimeout;
+        return false;
+      });
 
-              log.debug('node is not up ; will try again in', timeout, 'ms');
+    return Promise
+      .all([
+        connectPromise,
+        this.isNodeUp()
+      ])
+      .then(([ connected, isNodeUp ]) => {
+        if (connected) {
+          return true;
+        }
 
-              return new Promise((resolve, reject) => {
-                window.setTimeout(() => {
-                  this._connectWithToken(token).then(resolve).catch(reject);
-                }, timeout);
-              });
-            }
+        // If it's not up, try again in a few...
+        if (!isNodeUp) {
+          const timeout = this.transport.retryTimeout;
 
-            // The token is invalid
-            log.debug('tried with a wrong token', token);
-            return false;
+          log.debug('node is not up ; will try again in', timeout, 'ms');
+
+          return new Promise((resolve, reject) => {
+            window.setTimeout(() => {
+              this._connectWithToken(token).then(resolve).catch(reject);
+            }, timeout);
           });
+        }
+
+        // The token is invalid
+        log.debug('tried with a wrong token', token);
+        return false;
       });
   }
 

From 030d01102ceeb9d37248a0aa28d9546a172aea9c Mon Sep 17 00:00:00 2001
From: Nicolas Gotchac <ngotchac@gmail.com>
Date: Tue, 21 Mar 2017 17:02:41 +0100
Subject: [PATCH 7/9] Fix MethodDecoding for Arrays (#4977)

* Fix TypedInputs

* Remove unused code in inputQueries

* Use TypedInputs in Contract Events

* Linting

* Don't re-render events every second...
---
 js/src/ui/CopyToClipboard/copyToClipboard.css |  2 +-
 js/src/ui/Form/TypedInput/typedInput.css      |  1 -
 js/src/ui/Form/TypedInput/typedInput.js       | 49 ++++++++++++++-----
 js/src/ui/MethodDecoding/methodDecoding.js    | 12 +----
 js/src/util/abi.js                            |  2 +-
 js/src/views/Contract/Events/Event/event.js   | 47 +++++-------------
 js/src/views/Contract/Events/events.js        |  6 +++
 js/src/views/Contract/Queries/inputQuery.js   | 25 +---------
 js/src/views/Contract/Queries/queries.js      | 24 +--------
 js/src/views/WriteContract/writeContract.js   |  4 ++
 10 files changed, 64 insertions(+), 108 deletions(-)

diff --git a/js/src/ui/CopyToClipboard/copyToClipboard.css b/js/src/ui/CopyToClipboard/copyToClipboard.css
index 3b6db7843..4e2bb8cc4 100644
--- a/js/src/ui/CopyToClipboard/copyToClipboard.css
+++ b/js/src/ui/CopyToClipboard/copyToClipboard.css
@@ -28,6 +28,6 @@
   text-overflow: ellipsis;
 }
 
-.container {
+.container > * {
   display: flex;
 }
diff --git a/js/src/ui/Form/TypedInput/typedInput.css b/js/src/ui/Form/TypedInput/typedInput.css
index 88b269da3..1281c203c 100644
--- a/js/src/ui/Form/TypedInput/typedInput.css
+++ b/js/src/ui/Form/TypedInput/typedInput.css
@@ -25,7 +25,6 @@
     color: rgba(255, 255, 255, 0.498039);
     -webkit-user-select: none;
     font-size: 12px;
-    top: 11px;
     position: relative;
   }
 }
diff --git a/js/src/ui/Form/TypedInput/typedInput.js b/js/src/ui/Form/TypedInput/typedInput.js
index 16b3b0ca1..a6a84ad21 100644
--- a/js/src/ui/Form/TypedInput/typedInput.js
+++ b/js/src/ui/Form/TypedInput/typedInput.js
@@ -24,6 +24,7 @@ import AddIcon from 'material-ui/svg-icons/content/add';
 import RemoveIcon from 'material-ui/svg-icons/content/remove';
 
 import { fromWei, toWei } from '~/api/util/wei';
+import { bytesToHex } from '~/api/util/format';
 import Input from '~/ui/Form/Input';
 import InputAddressSelect from '~/ui/Form/InputAddressSelect';
 import Select from '~/ui/Form/Select';
@@ -68,7 +69,8 @@ export default class TypedInput extends Component {
   };
 
   componentWillMount () {
-    const { isEth, value } = this.props;
+    const { isEth } = this.props;
+    const value = this.getValue();
 
     if (typeof isEth === 'boolean' && value) {
       // Remove formatting commas
@@ -95,14 +97,15 @@ export default class TypedInput extends Component {
     const { type } = param;
 
     if (type === ABI_TYPES.ARRAY) {
-      const { accounts, className, label, value = param.default } = this.props;
+      const { accounts, className, label } = this.props;
       const { subtype, length } = param;
+      const value = this.getValue() || param.default;
 
       const fixedLength = !!length;
 
       const inputs = range(length || value.length).map((_, index) => {
         const onChange = (inputValue) => {
-          const newValues = [].concat(this.props.value);
+          const newValues = [].concat(value);
 
           newValues[index] = inputValue;
           this.props.onChange(newValues);
@@ -191,7 +194,14 @@ export default class TypedInput extends Component {
     }
 
     if (type === ABI_TYPES.BYTES) {
-      return this.renderDefault();
+      let value = this.getValue();
+
+      // Convert to hex if it's an array
+      if (Array.isArray(value)) {
+        value = bytesToHex(value);
+      }
+
+      return this.renderDefault(value);
     }
 
     // If the `isEth` prop is present (true or false)
@@ -260,7 +270,7 @@ export default class TypedInput extends Component {
       : bnValue.toFixed(); // we need a string representation, could be >15 digits
   }
 
-  renderInteger (value = this.props.value, onChange = this.onChange) {
+  renderInteger (value = this.getValue(), onChange = this.onChange) {
     const { allowCopy, className, label, error, hint, min, max, readOnly } = this.props;
     const param = this.getParam();
 
@@ -268,7 +278,7 @@ export default class TypedInput extends Component {
 
     return (
       <Input
-        allowCopy={ allowCopy }
+        allowCopy={ allowCopy ? value : undefined }
         className={ className }
         label={ label }
         hint={ hint }
@@ -291,7 +301,7 @@ export default class TypedInput extends Component {
    *
    * @see https://github.com/facebook/react/issues/1549
    */
-  renderFloat (value = this.props.value, onChange = this.onChange) {
+  renderFloat (value = this.getValue(), onChange = this.onChange) {
     const { allowCopy, className, label, error, hint, min, max, readOnly } = this.props;
     const param = this.getParam();
 
@@ -299,7 +309,7 @@ export default class TypedInput extends Component {
 
     return (
       <Input
-        allowCopy={ allowCopy }
+        allowCopy={ allowCopy ? value : undefined }
         className={ className }
         label={ label }
         hint={ hint }
@@ -314,8 +324,8 @@ export default class TypedInput extends Component {
     );
   }
 
-  renderDefault () {
-    const { allowCopy, className, label, value, error, hint, readOnly } = this.props;
+  renderDefault (value = this.getValue()) {
+    const { allowCopy, className, label, error, hint, readOnly } = this.props;
 
     return (
       <Input
@@ -332,7 +342,8 @@ export default class TypedInput extends Component {
   }
 
   renderAddress () {
-    const { accounts, allowCopy, className, label, value, error, hint, readOnly } = this.props;
+    const { accounts, allowCopy, className, label, error, hint, readOnly } = this.props;
+    const value = this.getValue();
 
     return (
       <InputAddressSelect
@@ -350,7 +361,8 @@ export default class TypedInput extends Component {
   }
 
   renderBoolean () {
-    const { allowCopy, className, label, value, error, hint, readOnly } = this.props;
+    const { allowCopy, className, label, error, hint, readOnly } = this.props;
+    const value = this.getValue();
 
     if (readOnly) {
       return this.renderDefault();
@@ -441,7 +453,7 @@ export default class TypedInput extends Component {
     onChange(newValues);
   }
 
-  getParam = () => {
+  getParam () {
     const { param } = this.props;
 
     if (typeof param === 'string') {
@@ -450,4 +462,15 @@ export default class TypedInput extends Component {
 
     return param;
   }
+
+  /**
+   * If the value comes from `decodeMethodInput`,
+   * it can be an object of the shape:
+   *   { value: Object, type: String }
+   */
+  getValue (value = this.props.value) {
+    return value && value.value
+      ? value.value
+      : value;
+  }
 }
diff --git a/js/src/ui/MethodDecoding/methodDecoding.js b/js/src/ui/MethodDecoding/methodDecoding.js
index 0bf8cce74..0aa603bca 100644
--- a/js/src/ui/MethodDecoding/methodDecoding.js
+++ b/js/src/ui/MethodDecoding/methodDecoding.js
@@ -560,7 +560,7 @@ class MethodDecoding extends Component {
           key={ index }
           param={ input.type }
           readOnly
-          value={ this.renderValue(input.value) }
+          value={ input.value }
         />
       );
     });
@@ -568,16 +568,6 @@ class MethodDecoding extends Component {
     return inputs;
   }
 
-  renderValue (value) {
-    const { api } = this.context;
-
-    if (api.util.isArray(value)) {
-      return api.util.bytesToHex(value);
-    }
-
-    return value.toString();
-  }
-
   renderTokenValue (value) {
     const { token } = this.props;
 
diff --git a/js/src/util/abi.js b/js/src/util/abi.js
index 34f575bb0..e2670f387 100644
--- a/js/src/util/abi.js
+++ b/js/src/util/abi.js
@@ -101,7 +101,7 @@ export function parseAbiType (type) {
     };
   }
 
-  if (type === 'bytes') {
+  if (type === 'bytes' || type === 'fixedBytes') {
     return {
       type: BYTES_TYPE,
       default: '0x'
diff --git a/js/src/views/Contract/Events/Event/event.js b/js/src/views/Contract/Events/Event/event.js
index 64e4cdd49..3c1572b51 100644
--- a/js/src/views/Contract/Events/Event/event.js
+++ b/js/src/views/Contract/Events/Event/event.js
@@ -19,7 +19,7 @@ import moment from 'moment';
 import React, { Component, PropTypes } from 'react';
 import { FormattedMessage } from 'react-intl';
 
-import { IdentityIcon, IdentityName, Input, InputAddress } from '~/ui';
+import { IdentityIcon, IdentityName, TypedInput } from '~/ui';
 import ShortenedHash from '~/ui/ShortenedHash';
 import { txLink } from '~/3rdparty/etherscan/links';
 
@@ -112,41 +112,16 @@ export default class Event extends Component {
   }
 
   renderParam (name, param) {
-    const { api } = this.context;
-
-    switch (param.type) {
-      case 'address':
-        return (
-          <InputAddress
-            disabled
-            text
-            className={ styles.input }
-            value={ param.value }
-            label={ name }
-          />
-        );
-
-      default:
-        let value;
-
-        if (api.util.isInstanceOf(param.value, BigNumber)) {
-          value = param.value.toFormat(0);
-        } else if (api.util.isArray(param.value)) {
-          value = api.util.bytesToHex(param.value);
-        } else {
-          value = param.value.toString();
-        }
-
-        return (
-          <Input
-            readOnly
-            allowCopy
-            className={ styles.input }
-            value={ value }
-            label={ name }
-          />
-        );
-    }
+    return (
+      <TypedInput
+        allowCopy
+        className={ styles.input }
+        label={ name }
+        param={ param.type }
+        readOnly
+        value={ param.value }
+      />
+    );
   }
 
   formatBlockTimestamp (block) {
diff --git a/js/src/views/Contract/Events/events.js b/js/src/views/Contract/Events/events.js
index a709c137a..a15565757 100644
--- a/js/src/views/Contract/Events/events.js
+++ b/js/src/views/Contract/Events/events.js
@@ -46,6 +46,12 @@ export default class Events extends Component {
     events: []
   };
 
+  shouldComponentUpdate (nextProps) {
+    return (nextProps.events !== this.props.events) ||
+      (nextProps.netVersion !== this.props.netVersion) ||
+      (nextProps.isLoading !== this.props.isLoading);
+  }
+
   render () {
     const { events, isLoading, netVersion } = this.props;
 
diff --git a/js/src/views/Contract/Queries/inputQuery.js b/js/src/views/Contract/Queries/inputQuery.js
index 8d4bddf02..7a75727f6 100644
--- a/js/src/views/Contract/Queries/inputQuery.js
+++ b/js/src/views/Contract/Queries/inputQuery.js
@@ -138,10 +138,8 @@ class InputQuery extends Component {
       .map((out, index) => ({
         name: out.name,
         type: out.type,
-        value: results[index],
-        display: this.renderValue(results[index])
+        value: results[index]
       }))
-      .sort((outA, outB) => outA.display.length - outB.display.length)
       .map((out, index) => {
         const input = (
           <TypedInput
@@ -150,7 +148,7 @@ class InputQuery extends Component {
             isEth={ false }
             param={ out.type }
             readOnly
-            value={ out.display }
+            value={ out.value }
           />
         );
 
@@ -195,25 +193,6 @@ class InputQuery extends Component {
     );
   }
 
-  renderValue (token) {
-    const { api } = this.context;
-    const { type, value } = token;
-
-    if (value === null || value === undefined) {
-      return 'no data';
-    }
-
-    if (type === 'array' || type === 'fixedArray') {
-      return value.map((tok) => this.renderValue(tok));
-    }
-
-    if (Array.isArray(value)) {
-      return api.util.bytesToHex(value);
-    }
-
-    return value;
-  }
-
   onClick = () => {
     const { inputs, values } = this.state;
     const { contract, name, outputs, signature } = this.props;
diff --git a/js/src/views/Contract/Queries/queries.js b/js/src/views/Contract/Queries/queries.js
index de939a93d..eef428eed 100644
--- a/js/src/views/Contract/Queries/queries.js
+++ b/js/src/views/Contract/Queries/queries.js
@@ -139,15 +139,14 @@ export default class Queries extends Component {
     );
   }
 
-  renderValue (tokenValue, output, key) {
-    if (typeof tokenValue === 'undefined') {
+  renderValue (value, output, key) {
+    if (typeof value === 'undefined') {
       return null;
     }
 
     const { accountsInfo } = this.props;
     const { name, type } = output;
     const label = `${name ? `${name}: ` : ''}${type}`;
-    const value = this.getTokenValue(tokenValue);
 
     return (
       <TypedInput
@@ -163,25 +162,6 @@ export default class Queries extends Component {
     );
   }
 
-  getTokenValue (token) {
-    const { api } = this.context;
-    const { type, value } = token;
-
-    if (value === null || value === undefined) {
-      return 'no data';
-    }
-
-    if (type === 'array' || type === 'fixedArray') {
-      return value.map((tok) => this.getTokenValue(tok));
-    }
-
-    if (Array.isArray(value)) {
-      return api.util.bytesToHex(value);
-    }
-
-    return value;
-  }
-
   _sortEntries (a, b) {
     return a.name.localeCompare(b.name);
   }
diff --git a/js/src/views/WriteContract/writeContract.js b/js/src/views/WriteContract/writeContract.js
index c4b08e3dd..86262820d 100644
--- a/js/src/views/WriteContract/writeContract.js
+++ b/js/src/views/WriteContract/writeContract.js
@@ -578,6 +578,10 @@ class WriteContract extends Component {
   }
 
   renderContract (contract) {
+    if (!contract) {
+      return null;
+    }
+
     const { bytecode } = contract;
     const abi = contract.interface;
 

From 3687a7c717b8e79e54567c432503b634c4fb4746 Mon Sep 17 00:00:00 2001
From: GitLab Build Bot <jaco+gitlab@ethcore.io>
Date: Tue, 21 Mar 2017 16:30:00 +0000
Subject: [PATCH 8/9] [ci skip] js-precompiled 20170321-162716

---
 Cargo.lock      | 2 +-
 js/package.json | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 014704746..56a1865dc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1699,7 +1699,7 @@ dependencies = [
 [[package]]
 name = "parity-ui-precompiled"
 version = "1.4.0"
-source = "git+https://github.com/ethcore/js-precompiled.git#5bb0ae216eec333a00d6fac3e5f6b253ca5be9c0"
+source = "git+https://github.com/ethcore/js-precompiled.git#47da49294ad958933e85a9c4f0f2bb4df5dc47de"
 dependencies = [
  "parity-dapps-glue 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
diff --git a/js/package.json b/js/package.json
index ac6513014..1e770ac34 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "parity.js",
-  "version": "1.7.21",
+  "version": "1.7.22",
   "main": "release/index.js",
   "jsnext:main": "src/index.js",
   "author": "Parity Team <admin@parity.io>",

From 797a3e1cd9c134ff097fc67e115f20e7fdf25245 Mon Sep 17 00:00:00 2001
From: Robert Habermeier <rphmeier@gmail.com>
Date: Tue, 21 Mar 2017 17:36:38 +0100
Subject: [PATCH 9/9] EIP198 and built-in activation (#4926)

* EIP198 and built-in activation

* address review
---
 Cargo.lock                           |   1 +
 ethcore/Cargo.toml                   |   1 +
 ethcore/res/ethereum/foundation.json |   1 +
 ethcore/src/builtin.rs               | 272 +++++++++++++++++++++++++--
 ethcore/src/engines/mod.rs           |  17 +-
 ethcore/src/executive.rs             |  13 +-
 ethcore/src/lib.rs                   |   1 +
 json/src/spec/builtin.rs             |  32 +++-
 8 files changed, 303 insertions(+), 35 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 56a1865dc..02ac8995d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -406,6 +406,7 @@ dependencies = [
  "linked-hash-map 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lru-cache 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.1.0",
diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index cdf0135e7..d1c9d624b 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -44,6 +44,7 @@ ethcore-stratum = { path = "../stratum" }
 ethcore-bloom-journal = { path = "../util/bloom" }
 hardware-wallet = { path = "../hw" }
 stats = { path = "../util/stats" }
+num = "0.1"
 
 [dependencies.hyper]
 git = "https://github.com/ethcore/hyper"
diff --git a/ethcore/res/ethereum/foundation.json b/ethcore/res/ethereum/foundation.json
index 7338b2f2b..77b0d5533 100644
--- a/ethcore/res/ethereum/foundation.json
+++ b/ethcore/res/ethereum/foundation.json
@@ -189,6 +189,7 @@
 		"0000000000000000000000000000000000000002": { "builtin": { "name": "sha256", "pricing": { "linear": { "base": 60, "word": 12 } } } },
 		"0000000000000000000000000000000000000003": { "builtin": { "name": "ripemd160", "pricing": { "linear": { "base": 600, "word": 120 } } } },
 		"0000000000000000000000000000000000000004": { "builtin": { "name": "identity", "pricing": { "linear": { "base": 15, "word": 3 } } } },
+		"0000000000000000000000000000000000000005": { "builtin": { "name": "modexp", "activate_at": "0x7fffffffffffff", "pricing": { "modexp": { "divisor": 20 } } } },
 		"3282791d6fd713f1e94f4bfd565eaa78b3a0599d": {
 			"balance": "1337000000000000000000"
 		},
diff --git a/ethcore/src/builtin.rs b/ethcore/src/builtin.rs
index ca3b13181..9927435dd 100644
--- a/ethcore/src/builtin.rs
+++ b/ethcore/src/builtin.rs
@@ -14,11 +14,16 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+use std::cmp::{max, min};
+use std::io::{self, Read};
+
+use byteorder::{ByteOrder, BigEndian};
 use crypto::sha2::Sha256 as Sha256Digest;
 use crypto::ripemd160::Ripemd160 as Ripemd160Digest;
 use crypto::digest::Digest;
-use std::cmp::min;
-use util::{U256, H256, Hashable, BytesRef};
+use num::{BigUint, Zero, One};
+
+use util::{U256, H256, Uint, Hashable, BytesRef};
 use ethkey::{Signature, recover as ec_recover};
 use ethjson;
 
@@ -30,8 +35,8 @@ pub trait Impl: Send + Sync {
 
 /// A gas pricing scheme for built-in contracts.
 pub trait Pricer: Send + Sync {
-	/// The gas cost of running this built-in for the given size of input data.
-	fn cost(&self, in_size: usize) -> U256;
+	/// The gas cost of running this built-in for the given input data.
+	fn cost(&self, input: &[u8]) -> U256;
 }
 
 /// A linear pricing model. This computes a price using a base cost and a cost per-word.
@@ -40,40 +45,94 @@ struct Linear {
 	word: usize,
 }
 
+/// A special pricing model for modular exponentiation.
+struct Modexp {
+	divisor: usize,
+}
+
 impl Pricer for Linear {
-	fn cost(&self, in_size: usize) -> U256 {
-		U256::from(self.base) + U256::from(self.word) * U256::from((in_size + 31) / 32)
+	fn cost(&self, input: &[u8]) -> U256 {
+		U256::from(self.base) + U256::from(self.word) * U256::from((input.len() + 31) / 32)
 	}
 }
 
-/// Pricing scheme and execution definition for a built-in contract.
+impl Pricer for Modexp {
+	fn cost(&self, input: &[u8]) -> U256 {
+		let mut reader = input.chain(io::repeat(0));
+		let mut buf = [0; 32];
+
+		// read lengths as U256 here for accurate gas calculation.
+		let mut read_len = || {
+			reader.read_exact(&mut buf[..]).expect("reading from zero-extended memory cannot fail; qed");
+			U256::from(H256::from_slice(&buf[..]))
+		};
+		let base_len = read_len();
+		let exp_len = read_len();
+		let mod_len = read_len();
+
+		// floor(max(length_of_MODULUS, length_of_BASE) ** 2 * max(length_of_EXPONENT, 1) / GQUADDIVISOR)
+		// TODO: is saturating the best behavior here?
+		let m = max(mod_len, base_len);
+		match m.overflowing_mul(m) {
+			(_, true) => U256::max_value(),
+			(val, _) => {
+				match val.overflowing_mul(max(exp_len, U256::one())) {
+					(_, true) => U256::max_value(),
+					(val, _) => val / (self.divisor as u64).into()
+				}
+			}
+		}
+	}
+}
+
+/// Pricing scheme, execution definition, and activation block for a built-in contract.
+///
+/// Call `cost` to compute cost for the given input, `execute` to execute the contract
+/// on the given input, and `is_active` to determine whether the contract is active.
+///
+/// Unless `is_active` is true,
 pub struct Builtin {
 	pricer: Box<Pricer>,
 	native: Box<Impl>,
+	activate_at: u64,
 }
 
 impl Builtin {
 	/// Simple forwarder for cost.
-	pub fn cost(&self, s: usize) -> U256 { self.pricer.cost(s) }
+	pub fn cost(&self, input: &[u8]) -> U256 { self.pricer.cost(input) }
 
 	/// Simple forwarder for execute.
 	pub fn execute(&self, input: &[u8], output: &mut BytesRef) { self.native.execute(input, output) }
+
+	/// Whether the builtin is activated at the given block number.
+	pub fn is_active(&self, at: u64) -> bool { at >= self.activate_at }
 }
 
 impl From<ethjson::spec::Builtin> for Builtin {
 	fn from(b: ethjson::spec::Builtin) -> Self {
-		let pricer = match b.pricing {
+		let pricer: Box<Pricer> = match b.pricing {
 			ethjson::spec::Pricing::Linear(linear) => {
 				Box::new(Linear {
 					base: linear.base,
 					word: linear.word,
 				})
 			}
+			ethjson::spec::Pricing::Modexp(exp) => {
+				Box::new(Modexp {
+					divisor: if exp.divisor == 0 {
+						warn!("Zero modexp divisor specified. Falling back to default.");
+						10
+					} else {
+						exp.divisor
+					}
+				})
+			}
 		};
 
 		Builtin {
 			pricer: pricer,
 			native: ethereum_builtin(&b.name),
+			activate_at: b.activate_at.map(Into::into).unwrap_or(0),
 		}
 	}
 }
@@ -85,6 +144,7 @@ fn ethereum_builtin(name: &str) -> Box<Impl> {
 		"ecrecover" => Box::new(EcRecover) as Box<Impl>,
 		"sha256" => Box::new(Sha256) as Box<Impl>,
 		"ripemd160" => Box::new(Ripemd160) as Box<Impl>,
+		"modexp" => Box::new(ModexpImpl) as Box<Impl>,
 		_ => panic!("invalid builtin name: {}", name),
 	}
 }
@@ -95,6 +155,7 @@ fn ethereum_builtin(name: &str) -> Box<Impl> {
 // - ec recovery
 // - sha256
 // - ripemd160
+// - modexp (EIP198)
 
 #[derive(Debug)]
 struct Identity;
@@ -108,6 +169,9 @@ struct Sha256;
 #[derive(Debug)]
 struct Ripemd160;
 
+#[derive(Debug)]
+struct ModexpImpl;
+
 impl Impl for Identity {
 	fn execute(&self, input: &[u8], output: &mut BytesRef) {
 		output.write(0, input);
@@ -166,9 +230,76 @@ impl Impl for Ripemd160 {
 	}
 }
 
+impl Impl for ModexpImpl {
+	fn execute(&self, input: &[u8], output: &mut BytesRef) {
+		let mut reader = input.chain(io::repeat(0));
+		let mut buf = [0; 32];
+
+		// read lengths as usize.
+		// ignoring the first 24 bytes might technically lead us to fall out of consensus,
+		// but so would running out of addressable memory!
+		let mut read_len = |reader: &mut io::Chain<&[u8], io::Repeat>| {
+			reader.read_exact(&mut buf[..]).expect("reading from zero-extended memory cannot fail; qed");
+			BigEndian::read_u64(&buf[24..]) as usize
+		};
+
+		let base_len = read_len(&mut reader);
+		let exp_len = read_len(&mut reader);
+		let mod_len = read_len(&mut reader);
+
+		// read the numbers themselves.
+		let mut buf = vec![0; max(mod_len, max(base_len, exp_len))];
+		let mut read_num = |len| {
+			reader.read_exact(&mut buf[..len]).expect("reading from zero-extended memory cannot fail; qed");
+			BigUint::from_bytes_be(&buf[..len])
+		};
+
+		let base = read_num(base_len);
+		let exp = read_num(exp_len);
+		let modulus = read_num(mod_len);
+
+		// calculate modexp: exponentiation by squaring.
+		fn modexp(mut base: BigUint, mut exp: BigUint, modulus: BigUint) -> BigUint {
+			match (base == BigUint::zero(), exp == BigUint::zero()) {
+				(_, true) => return BigUint::one(), // n^0 % m
+				(true, false) => return BigUint::zero(), // 0^n % m, n>0
+				(false, false) if modulus <= BigUint::one() => return BigUint::zero(), // a^b % 1 = 0.
+				_ => {}
+			}
+
+			let mut result = BigUint::one();
+			base = base % &modulus;
+
+			// fast path for base divisible by modulus.
+			if base == BigUint::zero() { return result }
+			while exp != BigUint::zero() {
+				// exp has to be on the right here to avoid move.
+				if BigUint::one() & &exp == BigUint::one() {
+					result = (result * &base) % &modulus;
+				}
+
+				exp = exp >> 1;
+				base = (base.clone() * base) % &modulus;
+			}
+
+			result
+		}
+
+		// write output to given memory, left padded and same length as the modulus.
+		let bytes = modexp(base, exp, modulus).to_bytes_be();
+
+		// always true except in the case of zero-length modulus, which leads to
+		// output of length and value 1.
+		if bytes.len() <= mod_len {
+			let res_start = mod_len - bytes.len();
+			output.write(res_start, &bytes);
+		}
+	}
+}
+
 #[cfg(test)]
 mod tests {
-	use super::{Builtin, Linear, ethereum_builtin, Pricer};
+	use super::{Builtin, Linear, ethereum_builtin, Pricer, Modexp};
 	use ethjson;
 	use util::{U256, BytesRef};
 
@@ -295,24 +426,126 @@ mod tests {
 		assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);*/
 	}
 
+	#[test]
+	fn modexp() {
+		use rustc_serialize::hex::FromHex;
+
+		let f = Builtin {
+			pricer: Box::new(Modexp { divisor: 20 }),
+			native: ethereum_builtin("modexp"),
+			activate_at: 0,
+		};
+		// fermat's little theorem example.
+		{
+			let input = FromHex::from_hex("\
+				0000000000000000000000000000000000000000000000000000000000000001\
+				0000000000000000000000000000000000000000000000000000000000000020\
+				0000000000000000000000000000000000000000000000000000000000000020\
+				03\
+				fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2e\
+				fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f"
+			).unwrap();
+
+			let mut output = vec![0u8; 32];
+			let expected = FromHex::from_hex("0000000000000000000000000000000000000000000000000000000000000001").unwrap();
+			let expected_cost = 1638;
+
+			f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..]));
+			assert_eq!(output, expected);
+			assert_eq!(f.cost(&input[..]), expected_cost.into());
+		}
+
+		// second example from EIP: zero base.
+		{
+			let input = FromHex::from_hex("\
+				0000000000000000000000000000000000000000000000000000000000000000\
+ 				0000000000000000000000000000000000000000000000000000000000000020\
+ 				0000000000000000000000000000000000000000000000000000000000000020\
+ 				fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2e\
+ 				fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f"
+			).unwrap();
+
+			let mut output = vec![0u8; 32];
+			let expected = FromHex::from_hex("0000000000000000000000000000000000000000000000000000000000000000").unwrap();
+			let expected_cost = 1638;
+
+			f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..]));
+			assert_eq!(output, expected);
+			assert_eq!(f.cost(&input[..]), expected_cost.into());
+		}
+
+		// another example from EIP: zero-padding
+		{
+			let input = FromHex::from_hex("\
+				0000000000000000000000000000000000000000000000000000000000000001\
+				0000000000000000000000000000000000000000000000000000000000000002\
+				0000000000000000000000000000000000000000000000000000000000000020\
+				03\
+				ffff\
+				80"
+			).unwrap();
+
+			let mut output = vec![0u8; 32];
+			let expected = FromHex::from_hex("3b01b01ac41f2d6e917c6d6a221ce793802469026d9ab7578fa2e79e4da6aaab").unwrap();
+			let expected_cost = 102;
+
+			f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..]));
+			assert_eq!(output, expected);
+			assert_eq!(f.cost(&input[..]), expected_cost.into());
+		}
+
+		// zero-length modulus.
+		{
+			let input = FromHex::from_hex("\
+				0000000000000000000000000000000000000000000000000000000000000001\
+				0000000000000000000000000000000000000000000000000000000000000002\
+				0000000000000000000000000000000000000000000000000000000000000000\
+				03\
+				ffff"
+			).unwrap();
+
+			let mut output = vec![];
+			let expected_cost = 0;
+
+			f.execute(&input[..], &mut BytesRef::Flexible(&mut output));
+			assert_eq!(output.len(), 0); // shouldn't have written any output.
+			assert_eq!(f.cost(&input[..]), expected_cost.into());
+		}
+	}
+
 	#[test]
 	#[should_panic]
 	fn from_unknown_linear() {
 		let _ = ethereum_builtin("foo");
 	}
 
+	#[test]
+	fn is_active() {
+		let pricer = Box::new(Linear { base: 10, word: 20} );
+		let b = Builtin {
+			pricer: pricer as Box<Pricer>,
+			native: ethereum_builtin("identity"),
+			activate_at: 100_000,
+		};
+
+		assert!(!b.is_active(99_999));
+		assert!(b.is_active(100_000));
+		assert!(b.is_active(100_001));
+	}
+
 	#[test]
 	fn from_named_linear() {
 		let pricer = Box::new(Linear { base: 10, word: 20 });
 		let b = Builtin {
 			pricer: pricer as Box<Pricer>,
 			native: ethereum_builtin("identity"),
+			activate_at: 1,
 		};
 
-		assert_eq!(b.cost(0), U256::from(10));
-		assert_eq!(b.cost(1), U256::from(30));
-		assert_eq!(b.cost(32), U256::from(30));
-		assert_eq!(b.cost(33), U256::from(50));
+		assert_eq!(b.cost(&[0; 0]), U256::from(10));
+		assert_eq!(b.cost(&[0; 1]), U256::from(30));
+		assert_eq!(b.cost(&[0; 32]), U256::from(30));
+		assert_eq!(b.cost(&[0; 33]), U256::from(50));
 
 		let i = [0u8, 1, 2, 3];
 		let mut o = [255u8; 4];
@@ -327,13 +560,14 @@ mod tests {
 			pricing: ethjson::spec::Pricing::Linear(ethjson::spec::Linear {
 				base: 10,
 				word: 20,
-			})
+			}),
+			activate_at: None,
 		});
 
-		assert_eq!(b.cost(0), U256::from(10));
-		assert_eq!(b.cost(1), U256::from(30));
-		assert_eq!(b.cost(32), U256::from(30));
-		assert_eq!(b.cost(33), U256::from(50));
+		assert_eq!(b.cost(&[0; 0]), U256::from(10));
+		assert_eq!(b.cost(&[0; 1]), U256::from(30));
+		assert_eq!(b.cost(&[0; 32]), U256::from(30));
+		assert_eq!(b.cost(&[0; 33]), U256::from(50));
 
 		let i = [0u8, 1, 2, 3];
 		let mut o = [255u8; 4];
diff --git a/ethcore/src/engines/mod.rs b/ethcore/src/engines/mod.rs
index 2cc1ff21f..f292a06d8 100644
--- a/ethcore/src/engines/mod.rs
+++ b/ethcore/src/engines/mod.rs
@@ -189,19 +189,14 @@ pub trait Engine : Sync + Send {
 	/// updating consensus state and potentially issuing a new one.
 	fn handle_message(&self, _message: &[u8]) -> Result<(), Error> { Err(EngineError::UnexpectedMessage.into()) }
 
+	/// Attempt to get a handle to a built-in contract.
+	/// Only returns references to activated built-ins.
 	// TODO: builtin contract routing - to do this properly, it will require removing the built-in configuration-reading logic
 	// from Spec into here and removing the Spec::builtins field.
-	/// Determine whether a particular address is a builtin contract.
-	fn is_builtin(&self, a: &Address) -> bool { self.builtins().contains_key(a) }
-	/// Determine the code execution cost of the builtin contract with address `a`.
-	/// Panics if `is_builtin(a)` is not true.
-	fn cost_of_builtin(&self, a: &Address, input: &[u8]) -> U256 {
-		self.builtins().get(a).expect("queried cost of nonexistent builtin").cost(input.len())
-	}
-	/// Execution the builtin contract `a` on `input` and return `output`.
-	/// Panics if `is_builtin(a)` is not true.
-	fn execute_builtin(&self, a: &Address, input: &[u8], output: &mut BytesRef) {
-		self.builtins().get(a).expect("attempted to execute nonexistent builtin").execute(input, output);
+	fn builtin(&self, a: &Address, block_number: ::header::BlockNumber) -> Option<&Builtin> {
+		self.builtins()
+			.get(a)
+			.and_then(|b| if b.is_active(block_number) { Some(b) } else { None })
 	}
 
 	/// Find out if the block is a proposal block and should not be inserted into the DB.
diff --git a/ethcore/src/executive.rs b/ethcore/src/executive.rs
index db1fe6a4e..cdae8a85f 100644
--- a/ethcore/src/executive.rs
+++ b/ethcore/src/executive.rs
@@ -261,17 +261,22 @@ impl<'a, B: 'a + StateBackend> Executive<'a, B> {
 		}
 		trace!("Executive::call(params={:?}) self.env_info={:?}", params, self.info);
 
-		if self.engine.is_builtin(&params.code_address) {
-			// if destination is builtin, try to execute it
+		// if destination is builtin, try to execute it
+		if let Some(builtin) = self.engine.builtin(&params.code_address, self.info.number) {
+			// Engines aren't supposed to return builtins until activation, but
+			// prefer to fail rather than silently break consensus.
+			if !builtin.is_active(self.info.number) {
+				panic!("Consensus failure: engine implementation prematurely enabled built-in at {}", params.code_address);
+			}
 
 			let default = [];
 			let data = if let Some(ref d) = params.data { d as &[u8] } else { &default as &[u8] };
 
 			let trace_info = tracer.prepare_trace_call(&params);
 
-			let cost = self.engine.cost_of_builtin(&params.code_address, data);
+			let cost = builtin.cost(data);
 			if cost <= params.gas {
-				self.engine.execute_builtin(&params.code_address, data, &mut output);
+				builtin.execute(data, &mut output);
 				self.state.discard_checkpoint();
 
 				// trace only top level calls to builtins to avoid DDoS attacks
diff --git a/ethcore/src/lib.rs b/ethcore/src/lib.rs
index a78e2120f..75c8a80e1 100644
--- a/ethcore/src/lib.rs
+++ b/ethcore/src/lib.rs
@@ -106,6 +106,7 @@ extern crate ethcore_stratum;
 extern crate ethabi;
 extern crate hardware_wallet;
 extern crate stats;
+extern crate num;
 
 #[macro_use]
 extern crate log;
diff --git a/json/src/spec/builtin.rs b/json/src/spec/builtin.rs
index 81a066585..892bf532e 100644
--- a/json/src/spec/builtin.rs
+++ b/json/src/spec/builtin.rs
@@ -16,6 +16,8 @@
 
 //! Spec builtin deserialization.
 
+use uint::Uint;
+
 /// Linear pricing.
 #[derive(Debug, PartialEq, Deserialize, Clone)]
 pub struct Linear {
@@ -25,12 +27,22 @@ pub struct Linear {
 	pub word: usize,
 }
 
+/// Pricing for modular exponentiation.
+#[derive(Debug, PartialEq, Deserialize, Clone)]
+pub struct Modexp {
+	/// Price divisor.
+	pub divisor: usize,
+}
+
 /// Pricing variants.
 #[derive(Debug, PartialEq, Deserialize, Clone)]
 pub enum Pricing {
 	/// Linear pricing.
 	#[serde(rename="linear")]
 	Linear(Linear),
+	/// Pricing for modular exponentiation.
+	#[serde(rename="modexp")]
+	Modexp(Modexp),
 }
 
 /// Spec builtin.
@@ -40,12 +52,15 @@ pub struct Builtin {
 	pub name: String,
 	/// Builtin pricing.
 	pub pricing: Pricing,
+	/// Activation block.
+	pub activate_at: Option<Uint>,
 }
 
 #[cfg(test)]
 mod tests {
 	use serde_json;
-	use spec::builtin::{Builtin, Pricing, Linear};
+	use spec::builtin::{Builtin, Pricing, Linear, Modexp};
+	use uint::Uint;
 
 	#[test]
 	fn builtin_deserialization() {
@@ -56,5 +71,20 @@ mod tests {
 		let deserialized: Builtin = serde_json::from_str(s).unwrap();
 		assert_eq!(deserialized.name, "ecrecover");
 		assert_eq!(deserialized.pricing, Pricing::Linear(Linear { base: 3000, word: 0 }));
+		assert!(deserialized.activate_at.is_none());
+	}
+
+	#[test]
+	fn activate_at() {
+		let s = r#"{
+			"name": "late_start",
+			"activate_at": 100000,
+			"pricing": { "modexp": { "divisor": 5 } }
+		}"#;
+
+		let deserialized: Builtin = serde_json::from_str(s).unwrap();
+		assert_eq!(deserialized.name, "late_start");
+		assert_eq!(deserialized.pricing, Pricing::Modexp(Modexp { divisor: 5 }));
+		assert_eq!(deserialized.activate_at, Some(Uint(100000.into())));
 	}
 }