github.com/theQRL/go-zond@v0.2.1/core/vm/jump_table_export.go (about)

     1  // Copyright 2023 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package vm
    18  
    19  import (
    20  	"github.com/theQRL/go-zond/params"
    21  )
    22  
    23  // LookupInstructionSet returns the instructionset for the fork configured by
    24  // the rules.
    25  func LookupInstructionSet(rules params.Rules) (JumpTable, error) {
    26  	return newShanghaiInstructionSet(), nil
    27  }
    28  
    29  // Stack returns the minimum and maximum stack requirements.
    30  func (op *operation) Stack() (int, int) {
    31  	return op.minStack, op.maxStack
    32  }
    33  
    34  // HasCost returns true if the opcode has a cost. Opcodes which do _not_ have
    35  // a cost assigned are one of two things:
    36  // - undefined, a.k.a invalid opcodes,
    37  // - the STOP opcode.
    38  // This method can thus be used to check if an opcode is "Invalid (or STOP)".
    39  func (op *operation) HasCost() bool {
    40  	// Ideally, we'd check this:
    41  	//	return op.execute == opUndefined
    42  	// However, go-lang does now allow that. So we'll just check some other
    43  	// 'indicators' that this is an invalid op. Alas, STOP is impossible to
    44  	// filter out
    45  	return op.dynamicGas != nil || op.constantGas != 0
    46  }