Introduce automatic ABI maintenance mechanism (2/2; rollout) (#8012)

* Introduce automatic ABI maintenance mechanism (2/2; rollout)

* Fix stable clippy

* Change to symlink

* Freeze abi of Tower

* fmt...

* Improve dev-experience!

* Update BankSlotDelta

$ diff -u /tmp/abi8/*7dg6BreYxTuxiVz6aLvk3p2Z7GQk2cJqfGvC9h4FAoSj* /tmp/abi8/*9chBcbXVJ4fK7uGgydQzam5aHipaAKFw6V4LDFpjbE4w*
--- /tmp/abi8/bank__BankSlotDelta_frozen_abi__test_abi_digest_7dg6BreYxTuxiVz6aLvk3p2Z7GQk2cJqfGvC9h4FAoSj      2020-06-18 18:01:22.831228087 +0900
+++ /tmp/abi8/bank__BankSlotDelta_frozen_abi__test_abi_digest_9chBcbXVJ4fK7uGgydQzam5aHipaAKFw6V4LDFpjbE4w      2020-07-03 15:59:58.430695244 +0900
@@ -140,7 +140,7 @@
                                                         field u8
                                                             primitive u8
                                                         field solana_sdk::instruction::InstructionError
-                                                            enum InstructionError (variants = 34)
+                                                            enum InstructionError (variants = 35)
                                                                 variant(0) GenericError (unit)
                                                                 variant(1) InvalidArgument (unit)
                                                                 variant(2) InvalidInstructionData (unit)
@@ -176,6 +176,7 @@
                                                                 variant(31) CallDepth (unit)
                                                                 variant(32) MissingAccount (unit)
                                                                 variant(33) ReentrancyNotAllowed (unit)
+                                                                variant(34) MaxSeedLengthExceeded (unit)
                                                     variant(9) CallChainTooDeep (unit)
                                                     variant(10) MissingSignatureForFee (unit)
                                                     variant(11) InvalidAccountIndex (unit)

* Fix some merge conflicts...

programs/stake/Cargo.toml

@@ -19,11 +19,15 @@ solana-metrics = { path = "../../metrics", version = "1.3.0" }
 solana-sdk = { path = "../../sdk", version = "1.3.0" }
 solana-vote-program = { path = "../vote", version = "1.3.0" }
 solana-config-program = { path = "../config", version = "1.3.0" }
+solana-sdk-macro-frozen-abi = { path = "../../sdk/macro-frozen-abi", version = "1.3.0" }
 thiserror = "1.0"
 
 [dev-dependencies]
 solana-logger = { path = "../../logger", version = "1.3.0" }
 
+[build-dependencies]
+rustc_version = "0.2"
+
 [lib]
 crate-type = ["lib"]
 name = "solana_stake_program"

programs/stake/build.rs

@@ -0,0 +1 @@
+../../sdk/build.rs

programs/stake/src/lib.rs

@@ -1,3 +1,4 @@
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
 use solana_sdk::genesis_config::GenesisConfig;
 
 pub mod config;
@@ -9,3 +10,6 @@ solana_sdk::declare_id!("Stake11111111111111111111111111111111111111");
 pub fn add_genesis_accounts(genesis_config: &mut GenesisConfig) -> u64 {
     config::add_genesis_account(genesis_config)
 }
+
+#[macro_use]
+extern crate solana_sdk_macro_frozen_abi;

programs/stake/src/stake_state.rs

@@ -21,7 +21,7 @@ use solana_sdk::{
 use solana_vote_program::vote_state::{VoteState, VoteStateVersions};
 use std::collections::HashSet;
 
-#[derive(Debug, Serialize, Deserialize, PartialEq, Clone, Copy)]
+#[derive(Debug, Serialize, Deserialize, PartialEq, Clone, Copy, AbiExample)]
 #[allow(clippy::large_enum_variant)]
 pub enum StakeState {
     Uninitialized,
@@ -91,13 +91,13 @@ impl StakeState {
     }
 }
 
-#[derive(Debug, Serialize, Deserialize, PartialEq, Clone, Copy)]
+#[derive(Debug, Serialize, Deserialize, PartialEq, Clone, Copy, AbiExample)]
 pub enum StakeAuthorize {
     Staker,
     Withdrawer,
 }
 
-#[derive(Default, Debug, Serialize, Deserialize, PartialEq, Clone, Copy)]
+#[derive(Default, Debug, Serialize, Deserialize, PartialEq, Clone, Copy, AbiExample)]
 pub struct Lockup {
     /// UnixTimestamp at which this stake will allow withdrawal, unless the
     ///   transaction is signed by the custodian
@@ -117,13 +117,13 @@ impl Lockup {
     }
 }
 
-#[derive(Default, Debug, Serialize, Deserialize, PartialEq, Clone, Copy)]
+#[derive(Default, Debug, Serialize, Deserialize, PartialEq, Clone, Copy, AbiExample)]
 pub struct Authorized {
     pub staker: Pubkey,
     pub withdrawer: Pubkey,
 }
 
-#[derive(Default, Debug, Serialize, Deserialize, PartialEq, Clone, Copy)]
+#[derive(Default, Debug, Serialize, Deserialize, PartialEq, Clone, Copy, AbiExample)]
 pub struct Meta {
     pub rent_exempt_reserve: u64,
     pub authorized: Authorized,
@@ -152,7 +152,7 @@ impl Meta {
     }
 }
 
-#[derive(Debug, Serialize, Deserialize, PartialEq, Clone, Copy)]
+#[derive(Debug, Serialize, Deserialize, PartialEq, Clone, Copy, AbiExample)]
 pub struct Delegation {
     /// to whom the stake is delegated
     pub voter_pubkey: Pubkey,
@@ -313,7 +313,7 @@ impl Delegation {
     }
 }
 
-#[derive(Debug, Default, Serialize, Deserialize, PartialEq, Clone, Copy)]
+#[derive(Debug, Default, Serialize, Deserialize, PartialEq, Clone, Copy, AbiExample)]
 pub struct Stake {
     pub delegation: Delegation,
     /// credits observed is credits from vote account state when delegated or redeemed