core: implement BLOBBASEFEE opcode (0x4a) (#28098)

Implements "EIP-7516: BLOBBASEFEE opcode" for cancun, as per spec: https://eips.ethereum.org/EIPS/eip-7516

cmd/evm/internal/t8ntool/execution.go

@@ -163,17 +163,19 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		rnd := common.BigToHash(pre.Env.Random)
 		vmContext.Random = &rnd
 	}
-	// If excessBlobGas is defined, add it to the vmContext.
+	// Calculate the BlobBaseFee
+	var excessBlobGas uint64
 	if pre.Env.ExcessBlobGas != nil {
-		vmContext.ExcessBlobGas = pre.Env.ExcessBlobGas
+		excessBlobGas := *pre.Env.ExcessBlobGas
+		vmContext.BlobBaseFee = eip4844.CalcBlobFee(excessBlobGas)
 	} else {
 		// If it is not explicitly defined, but we have the parent values, we try
 		// to calculate it ourselves.
 		parentExcessBlobGas := pre.Env.ParentExcessBlobGas
 		parentBlobGasUsed := pre.Env.ParentBlobGasUsed
 		if parentExcessBlobGas != nil && parentBlobGasUsed != nil {
-			excessBlobGas := eip4844.CalcExcessBlobGas(*parentExcessBlobGas, *parentBlobGasUsed)
+			excessBlobGas = eip4844.CalcExcessBlobGas(*parentExcessBlobGas, *parentBlobGasUsed)
-			vmContext.ExcessBlobGas = &excessBlobGas
+			vmContext.BlobBaseFee = eip4844.CalcBlobFee(excessBlobGas)
 		}
 	}
 	// If DAO is supported/enabled, we need to handle it here. In geth 'proper', it's
@@ -189,7 +191,7 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 	}
 	var blobGasUsed uint64
 	for i, tx := range txs {
-		if tx.Type() == types.BlobTxType && vmContext.ExcessBlobGas == nil {
+		if tx.Type() == types.BlobTxType && vmContext.BlobBaseFee == nil {
 			errMsg := "blob tx used but field env.ExcessBlobGas missing"
 			log.Warn("rejected tx", "index", i, "hash", tx.Hash(), "error", errMsg)
 			rejectedTxs = append(rejectedTxs, &rejectedTx{i, errMsg})
@@ -322,8 +324,8 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		h := types.DeriveSha(types.Withdrawals(pre.Env.Withdrawals), trie.NewStackTrie(nil))
 		execRs.WithdrawalsRoot = &h
 	}
-	if vmContext.ExcessBlobGas != nil {
+	if vmContext.BlobBaseFee != nil {
-		execRs.CurrentExcessBlobGas = (*math.HexOrDecimal64)(vmContext.ExcessBlobGas)
+		execRs.CurrentExcessBlobGas = (*math.HexOrDecimal64)(&excessBlobGas)
 		execRs.CurrentBlobGasUsed = (*math.HexOrDecimal64)(&blobGasUsed)
 	}
 	// Re-create statedb instance with new root upon the updated database

cmd/evm/runner.go

@@ -124,6 +124,7 @@ func runCmd(ctx *cli.Context) error {
 		receiver    = common.BytesToAddress([]byte("receiver"))
 		preimages   = ctx.Bool(DumpFlag.Name)
 		blobHashes  []common.Hash  // TODO (MariusVanDerWijden) implement blob hashes in state tests
+		blobBaseFee = new(big.Int) // TODO (MariusVanDerWijden) implement blob fee in state tests
 	)
 	if ctx.Bool(MachineFlag.Name) {
 		tracer = logger.NewJSONLogger(logconfig, os.Stdout)
@@ -221,6 +222,7 @@ func runCmd(ctx *cli.Context) error {
 		Coinbase:    genesisConfig.Coinbase,
 		BlockNumber: new(big.Int).SetUint64(genesisConfig.Number),
 		BlobHashes:  blobHashes,
+		BlobBaseFee: blobBaseFee,
 		EVMConfig: vm.Config{
 			Tracer: tracer,
 		},

core/evm.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus"
+	"github.com/ethereum/go-ethereum/consensus/misc/eip4844"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 )
@@ -40,6 +41,7 @@ func NewEVMBlockContext(header *types.Header, chain ChainContext, author *common
 	var (
 		beneficiary common.Address
 		baseFee     *big.Int
+		blobBaseFee *big.Int
 		random      *common.Hash
 	)
 
@@ -52,6 +54,9 @@ func NewEVMBlockContext(header *types.Header, chain ChainContext, author *common
 	if header.BaseFee != nil {
 		baseFee = new(big.Int).Set(header.BaseFee)
 	}
+	if header.ExcessBlobGas != nil {
+		blobBaseFee = eip4844.CalcBlobFee(*header.ExcessBlobGas)
+	}
 	if header.Difficulty.Cmp(common.Big0) == 0 {
 		random = &header.MixDigest
 	}
@@ -64,9 +69,9 @@ func NewEVMBlockContext(header *types.Header, chain ChainContext, author *common
 		Time:        header.Time,
 		Difficulty:  new(big.Int).Set(header.Difficulty),
 		BaseFee:     baseFee,
+		BlobBaseFee: blobBaseFee,
 		GasLimit:    header.GasLimit,
 		Random:      random,
-		ExcessBlobGas: header.ExcessBlobGas,
 	}
 }
 

core/state_processor.go

@@ -24,7 +24,6 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus"
 	"github.com/ethereum/go-ethereum/consensus/misc"
-	"github.com/ethereum/go-ethereum/consensus/misc/eip4844"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
@@ -138,7 +137,7 @@ func applyTransaction(msg *Message, config *params.ChainConfig, gp *GasPool, sta
 
 	if tx.Type() == types.BlobTxType {
 		receipt.BlobGasUsed = uint64(len(tx.BlobHashes()) * params.BlobTxBlobGasPerBlob)
-		receipt.BlobGasPrice = eip4844.CalcBlobFee(*evm.Context.ExcessBlobGas)
+		receipt.BlobGasPrice = evm.Context.BlobBaseFee
 	}
 
 	// If the transaction created a contract, store the creation address in the receipt.

core/state_transition.go

@@ -24,7 +24,6 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	cmath "github.com/ethereum/go-ethereum/common/math"
-	"github.com/ethereum/go-ethereum/consensus/misc/eip4844"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/params"
@@ -248,7 +247,7 @@ func (st *StateTransition) buyGas() error {
 			balanceCheck.Add(balanceCheck, blobBalanceCheck)
 			// Pay for blobGasUsed * actual blob fee
 			blobFee := new(big.Int).SetUint64(blobGas)
-			blobFee.Mul(blobFee, eip4844.CalcBlobFee(*st.evm.Context.ExcessBlobGas))
+			blobFee.Mul(blobFee, st.evm.Context.BlobBaseFee)
 			mgval.Add(mgval, blobFee)
 		}
 	}
@@ -329,7 +328,7 @@ func (st *StateTransition) preCheck() error {
 	if st.evm.ChainConfig().IsCancun(st.evm.Context.BlockNumber, st.evm.Context.Time) {
 		if st.blobGasUsed() > 0 {
 			// Check that the user is paying at least the current blob fee
-			blobFee := eip4844.CalcBlobFee(*st.evm.Context.ExcessBlobGas)
+			blobFee := st.evm.Context.BlobBaseFee
 			if st.msg.BlobGasFeeCap.Cmp(blobFee) < 0 {
 				return fmt.Errorf("%w: address %v have %v want %v", ErrBlobFeeCapTooLow, st.msg.From.Hex(), st.msg.BlobGasFeeCap, blobFee)
 			}

core/vm/eips.go

@@ -282,9 +282,15 @@ func opBlobHash(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([
 	return nil, nil
 }
 
-// enable4844 applies EIP-4844 (DATAHASH opcode)
+// opBlobBaseFee implements BLOBBASEFEE opcode
+func opBlobBaseFee(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
+	blobBaseFee, _ := uint256.FromBig(interpreter.evm.Context.BlobBaseFee)
+	scope.Stack.push(blobBaseFee)
+	return nil, nil
+}
+
+// enable4844 applies EIP-4844 (BLOBHASH opcode)
 func enable4844(jt *JumpTable) {
-	// New opcode
 	jt[BLOBHASH] = &operation{
 		execute:     opBlobHash,
 		constantGas: GasFastestStep,
@@ -293,6 +299,16 @@ func enable4844(jt *JumpTable) {
 	}
 }
 
+// enable7516 applies EIP-7516 (BLOBBASEFEE opcode)
+func enable7516(jt *JumpTable) {
+	jt[BLOBBASEFEE] = &operation{
+		execute:     opBlobBaseFee,
+		constantGas: GasQuickStep,
+		minStack:    minStack(0, 1),
+		maxStack:    maxStack(0, 1),
+	}
+}
+
 // enable6780 applies EIP-6780 (deactivate SELFDESTRUCT)
 func enable6780(jt *JumpTable) {
 	jt[SELFDESTRUCT] = &operation{

core/vm/evm.go

@@ -73,8 +73,8 @@ type BlockContext struct {
 	Time        uint64         // Provides information for TIME
 	Difficulty  *big.Int       // Provides information for DIFFICULTY
 	BaseFee     *big.Int       // Provides information for BASEFEE
+	BlobBaseFee *big.Int       // Provides information for BLOBBASEFEE
 	Random      *common.Hash   // Provides information for PREVRANDAO
-	ExcessBlobGas *uint64        // ExcessBlobGas field in the header, needed to compute the data
 }
 
 // TxContext provides the EVM with information about a transaction.

core/vm/jump_table.go

@@ -82,7 +82,8 @@ func validate(jt JumpTable) JumpTable {
 
 func newCancunInstructionSet() JumpTable {
 	instructionSet := newShanghaiInstructionSet()
-	enable4844(&instructionSet) // EIP-4844 (DATAHASH opcode)
+	enable4844(&instructionSet) // EIP-4844 (BLOBHASH opcode)
+	enable7516(&instructionSet) // EIP-7516 (BLOBBASEFEE opcode)
 	enable1153(&instructionSet) // EIP-1153 "Transient Storage"
 	enable5656(&instructionSet) // EIP-5656 (MCOPY opcode)
 	enable6780(&instructionSet) // EIP-6780 SELFDESTRUCT only in same transaction

core/vm/opcodes.go

@@ -101,6 +101,7 @@ const (
 	SELFBALANCE OpCode = 0x47
 	BASEFEE     OpCode = 0x48
 	BLOBHASH    OpCode = 0x49
+	BLOBBASEFEE OpCode = 0x4a
 )
 
 // 0x50 range - 'storage' and execution.
@@ -287,6 +288,7 @@ var opCodeToString = map[OpCode]string{
 	SELFBALANCE: "SELFBALANCE",
 	BASEFEE:     "BASEFEE",
 	BLOBHASH:    "BLOBHASH",
+	BLOBBASEFEE: "BLOBBASEFEE",
 
 	// 0x50 range - 'storage' and execution.
 	POP:      "POP",
@@ -444,6 +446,7 @@ var stringToOp = map[string]OpCode{
 	"CHAINID":        CHAINID,
 	"BASEFEE":        BASEFEE,
 	"BLOBHASH":       BLOBHASH,
+	"BLOBBASEFEE":    BLOBBASEFEE,
 	"DELEGATECALL":   DELEGATECALL,
 	"STATICCALL":     STATICCALL,
 	"CODESIZE":       CODESIZE,

core/vm/runtime/env.go

@@ -37,6 +37,7 @@ func NewEnv(cfg *Config) *vm.EVM {
 		Difficulty:  cfg.Difficulty,
 		GasLimit:    cfg.GasLimit,
 		BaseFee:     cfg.BaseFee,
+		BlobBaseFee: cfg.BlobBaseFee,
 		Random:      cfg.Random,
 	}
 

core/vm/runtime/runtime.go

@@ -44,6 +44,7 @@ type Config struct {
 	Debug       bool
 	EVMConfig   vm.Config
 	BaseFee     *big.Int
+	BlobBaseFee *big.Int
 	BlobHashes  []common.Hash
 	Random      *common.Hash
 
@@ -95,6 +96,9 @@ func setDefaults(cfg *Config) {
 	if cfg.BaseFee == nil {
 		cfg.BaseFee = big.NewInt(params.InitialBaseFee)
 	}
+	if cfg.BlobBaseFee == nil {
+		cfg.BlobBaseFee = new(big.Int)
+	}
 }
 
 // Execute executes the code using the input as call data during the execution.

internal/ethapi/api.go

@@ -998,6 +998,7 @@ type BlockOverrides struct {
 	Coinbase    *common.Address
 	Random      *common.Hash
 	BaseFee     *hexutil.Big
+	BlobBaseFee *hexutil.Big
 }
 
 // Apply overrides the given header fields into the given block context.
@@ -1026,6 +1027,9 @@ func (diff *BlockOverrides) Apply(blockCtx *vm.BlockContext) {
 	if diff.BaseFee != nil {
 		blockCtx.BaseFee = diff.BaseFee.ToInt()
 	}
+	if diff.BlobBaseFee != nil {
+		blockCtx.BlobBaseFee = diff.BlobBaseFee.ToInt()
+	}
 }
 
 // ChainContextBackend provides methods required to implement ChainContext.