From 03103fb63ddf10efe2a4c7b66da3edf51190f74f Mon Sep 17 00:00:00 2001
From: Hadrien Charlanes <hadrien@variabl.io>
Date: Tue, 27 Apr 2021 18:26:08 +0200
Subject: [PATCH] adding stack too deep

---
 contracts/protocol/libraries/helpers/Errors.sol  |  1 +
 .../protocol/libraries/logic/ValidationLogic.sol | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/contracts/protocol/libraries/helpers/Errors.sol b/contracts/protocol/libraries/helpers/Errors.sol
index 304f0a33..6ee6cced 100644
--- a/contracts/protocol/libraries/helpers/Errors.sol
+++ b/contracts/protocol/libraries/helpers/Errors.sol
@@ -103,6 +103,7 @@ library Errors {
   string public constant LP_NOT_CONTRACT = '78';
   string public constant SDT_STABLE_DEBT_OVERFLOW = '79';
   string public constant SDT_BURN_EXCEEDS_BALANCE = '80';
+  string public constant VL_BORROW_CAP_EXCEEDED = '81';
   string public constant RC_INVALID_BORROW_CAP = '82';
 
   enum CollateralManagerErrors {
diff --git a/contracts/protocol/libraries/logic/ValidationLogic.sol b/contracts/protocol/libraries/logic/ValidationLogic.sol
index 080b792d..564759c3 100644
--- a/contracts/protocol/libraries/logic/ValidationLogic.sol
+++ b/contracts/protocol/libraries/logic/ValidationLogic.sol
@@ -14,6 +14,8 @@ import {UserConfiguration} from '../configuration/UserConfiguration.sol';
 import {Errors} from '../helpers/Errors.sol';
 import {Helpers} from '../helpers/Helpers.sol';
 import {IReserveInterestRateStrategy} from '../../../interfaces/IReserveInterestRateStrategy.sol';
+import {IVariableDebtToken} from '../../../interfaces/IVariableDebtToken.sol';
+import {IStableDebtToken} from '../../../interfaces/IStableDebtToken.sol';
 import {DataTypes} from '../types/DataTypes.sol';
 
 /**
@@ -149,6 +151,20 @@ library ValidationLogic {
         uint256(DataTypes.InterestRateMode.STABLE) == interestRateMode,
       Errors.VL_INVALID_INTEREST_RATE_MODE_SELECTED
     );
+    
+    // not using this because stack too deep
+    // uint256 totalStableDebt;
+    // (totalStableDebt, ) = IStableDebtToken(reserve.stableDebtTokenAddress)
+    //   .getTotalSupplyAndAvgRate();
+      
+    require(
+      IERC20(reserve.stableDebtTokenAddress).totalSupply()
+        .add(IVariableDebtToken(reserve.variableDebtTokenAddress)
+          .scaledTotalSupply()
+          .rayMul(reserve.variableBorrowIndex)
+        ).add(amount)
+        < reserve.configuration.getBorrowCap(),
+      Errors.VL_BORROW_CAP_EXCEEDED);
 
     (
       vars.userCollateralBalanceETH,