[Flow EVM] use big.Int for any balance related fields

fvm/evm/handler/blockstore_test.go

@@ -1,6 +1,7 @@
 package handler_test
 
 import (
+	"math/big"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -32,7 +33,7 @@ func TestBlockStore(t *testing.T) {
 			require.Equal(t, expectedParentHash, bp.ParentBlockHash)
 
 			// commit block proposal
-			supply := uint64(100)
+			supply := big.NewInt(100)
 			bp.TotalSupply = supply
 			err = bs.CommitBlockProposal()
 			require.NoError(t, err)

fvm/evm/handler/handler.go

@@ -2,6 +2,7 @@ package handler
 
 import (
 	"bytes"
+	"math/big"
 
 	gethTypes "github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -14,14 +15,6 @@ import (
 
 // ContractHandler is responsible for triggering calls to emulator, metering,
 // event emission and updating the block
-//
-// TODO and Warning: currently database keeps a copy of roothash, and if after
-// commiting the changes by the evm we want to revert in this code we need to reset that
-// or we should always do all the checks and return before calling the emulator,
-// after that should be only event emissions and computation usage updates.
-// thats another reason we first check the computation limit before using.
-// in the future we might benefit from a view style of access to db passed as
-// a param to the emulator.
 type ContractHandler struct {
 	flowTokenAddress common.Address
 	blockstore       types.BlockStore
@@ -199,7 +192,7 @@ func (a *Account) Deposit(v *types.FLOWTokenVault) {
 		a.address,
 		v.Balance().ToAttoFlow(),
 	)
-	a.executeAndHandleCall(a.fch.getBlockContext(), call, v.Balance().ToAttoFlow().Uint64(), false)
+	a.executeAndHandleCall(a.fch.getBlockContext(), call, v.Balance().ToAttoFlow(), false)
 }
 
 // Withdraw deducts the balance from the account and
@@ -213,15 +206,16 @@ func (a *Account) Withdraw(b types.Balance) *types.FLOWTokenVault {
 	// check balance of flex vault
 	bp, err := a.fch.blockstore.BlockProposal()
 	handleError(err)
-	if b.ToAttoFlow().Uint64() > bp.TotalSupply {
+	// b > total supply
+	if b.ToAttoFlow().Cmp(bp.TotalSupply) == 1 {
 		handleError(types.ErrInsufficientTotalSupply)
 	}
 
 	call := types.NewWithdrawCall(
 		a.address,
 		b.ToAttoFlow(),
 	)
-	a.executeAndHandleCall(a.fch.getBlockContext(), call, b.ToAttoFlow().Uint64(), true)
+	a.executeAndHandleCall(a.fch.getBlockContext(), call, b.ToAttoFlow(), true)
 
 	return types.NewFlowTokenVault(b)
 }
@@ -238,7 +232,7 @@ func (a *Account) Transfer(to types.Address, balance types.Balance) {
 		to,
 		balance.ToAttoFlow(),
 	)
-	a.executeAndHandleCall(ctx, call, 0, false)
+	a.executeAndHandleCall(ctx, call, nil, false)
 }
 
 // Deploy deploys a contract to the EVM environment
@@ -254,7 +248,7 @@ func (a *Account) Deploy(code types.Code, gaslimit types.GasLimit, balance types
 		uint64(gaslimit),
 		balance.ToAttoFlow(),
 	)
-	res := a.executeAndHandleCall(a.fch.getBlockContext(), call, 0, false)
+	res := a.executeAndHandleCall(a.fch.getBlockContext(), call, nil, false)
 	return types.Address(res.DeployedContractAddress)
 }
 
@@ -272,14 +266,14 @@ func (a *Account) Call(to types.Address, data types.Data, gaslimit types.GasLimi
 		uint64(gaslimit),
 		balance.ToAttoFlow(),
 	)
-	res := a.executeAndHandleCall(a.fch.getBlockContext(), call, 0, false)
+	res := a.executeAndHandleCall(a.fch.getBlockContext(), call, nil, false)
 	return res.ReturnedValue
 }
 
 func (a *Account) executeAndHandleCall(
 	ctx types.BlockContext,
 	call *types.DirectCall,
-	totalSupplyDiff uint64,
+	totalSupplyDiff *big.Int,
 	deductSupplyDiff bool,
 ) *types.Result {
 	// execute the call
@@ -300,11 +294,13 @@ func (a *Account) executeAndHandleCall(
 	bp, err := a.fch.blockstore.BlockProposal()
 	handleError(err)
 	bp.AppendTxHash(callHash)
-	if deductSupplyDiff {
-		bp.TotalSupply -= totalSupplyDiff
-	} else {
-		// TODO: add overflow errors (even though we might never get there)
-		bp.TotalSupply += totalSupplyDiff
+	if totalSupplyDiff != nil {
+		if deductSupplyDiff {
+			bp.TotalSupply = new(big.Int).Sub(bp.TotalSupply, totalSupplyDiff)
+		} else {
+			bp.TotalSupply = new(big.Int).Add(bp.TotalSupply, totalSupplyDiff)
+		}
+
 	}
 
 	// emit events

fvm/evm/types/block.go

@@ -1,6 +1,8 @@
 package types
 
 import (
+	"math/big"
+
 	gethCommon "github.com/ethereum/go-ethereum/common"
 	gethTypes "github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -15,8 +17,8 @@ type Block struct {
 	// Height returns the height of this block
 	Height uint64
 
-	// holds the total amount of the native token deposited in the evm side.
-	TotalSupply uint64
+	// holds the total amount of the native token deposited in the evm side. (in attoflow)
+	TotalSupply *big.Int
 
 	// ReceiptRoot returns the root hash of the receipts emitted in this block
 	ReceiptRoot gethCommon.Hash
@@ -42,7 +44,7 @@ func (b *Block) AppendTxHash(txHash gethCommon.Hash) {
 }
 
 // NewBlock constructs a new block
-func NewBlock(height, uuidIndex, totalSupply uint64,
+func NewBlock(height, uuidIndex uint64, totalSupply *big.Int,
 	stateRoot, receiptRoot gethCommon.Hash,
 	txHashes []gethCommon.Hash,
 ) *Block {

fvm/evm/types/events.go

@@ -123,7 +123,7 @@ func (p *BlockExecutedEventPayload) CadenceEvent() (cadence.Event, error) {
 
 	fields := []cadence.Value{
 		cadence.NewUInt64(p.Block.Height),
-		cadence.NewUInt64(p.Block.TotalSupply),
+		cadence.String(p.Block.TotalSupply.String()),
 		cadence.String(p.Block.ReceiptRoot.String()),
 		cadence.String(p.Block.ParentBlockHash.String()),
 		cadence.NewArray(hashes).WithType(cadence.NewVariableSizedArrayType(cadence.StringType{})),