126 lines
3.8 KiB
Go
126 lines
3.8 KiB
Go
package vm
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/params"
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"math/big"
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)
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var (
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GasQuickStep = big.NewInt(2)
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GasFastestStep = big.NewInt(3)
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GasFastStep = big.NewInt(5)
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GasMidStep = big.NewInt(8)
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GasSlowStep = big.NewInt(10)
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GasExtStep = big.NewInt(20)
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GasReturn = big.NewInt(0)
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GasStop = big.NewInt(0)
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GasContractByte = big.NewInt(200)
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)
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func baseCheck(op OpCode, stack *stack, gas *big.Int) error {
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// PUSH and DUP are a bit special. They all cost the same but we do want to have checking on stack push limit
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// PUSH is also allowed to calculate the same price for all PUSHes
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// DUP requirements are handled elsewhere (except for the stack limit check)
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if op >= PUSH1 && op <= PUSH32 {
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op = PUSH1
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}
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if op >= DUP1 && op <= DUP16 {
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op = DUP1
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}
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if r, ok := _baseCheck[op]; ok {
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err := stack.require(r.stackPop)
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if err != nil {
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return err
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}
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if r.stackPush && len(stack.data)-r.stackPop+1 > int(params.StackLimit.Int64()) {
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return fmt.Errorf("stack limit reached (%d)", params.StackLimit.Int64())
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}
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gas.Add(gas, r.gas)
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}
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return nil
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}
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func toWordSize(size *big.Int) *big.Int {
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tmp := new(big.Int)
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tmp.Add(size, u256(31))
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tmp.Div(tmp, u256(32))
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return tmp
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}
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type req struct {
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stackPop int
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gas *big.Int
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stackPush bool
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}
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var _baseCheck = map[OpCode]req{
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// opcode | stack pop | gas price | stack push
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ADD: {2, GasFastestStep, true},
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LT: {2, GasFastestStep, true},
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GT: {2, GasFastestStep, true},
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SLT: {2, GasFastestStep, true},
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SGT: {2, GasFastestStep, true},
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EQ: {2, GasFastestStep, true},
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ISZERO: {1, GasFastestStep, true},
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SUB: {2, GasFastestStep, true},
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AND: {2, GasFastestStep, true},
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OR: {2, GasFastestStep, true},
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XOR: {2, GasFastestStep, true},
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NOT: {1, GasFastestStep, true},
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BYTE: {2, GasFastestStep, true},
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CALLDATALOAD: {1, GasFastestStep, true},
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CALLDATACOPY: {3, GasFastestStep, true},
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MLOAD: {1, GasFastestStep, true},
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MSTORE: {2, GasFastestStep, false},
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MSTORE8: {2, GasFastestStep, false},
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CODECOPY: {3, GasFastestStep, false},
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MUL: {2, GasFastStep, true},
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DIV: {2, GasFastStep, true},
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SDIV: {2, GasFastStep, true},
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MOD: {2, GasFastStep, true},
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SMOD: {2, GasFastStep, true},
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SIGNEXTEND: {2, GasFastStep, true},
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ADDMOD: {3, GasMidStep, true},
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MULMOD: {3, GasMidStep, true},
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JUMP: {1, GasMidStep, false},
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JUMPI: {2, GasSlowStep, false},
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EXP: {2, GasSlowStep, true},
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ADDRESS: {0, GasQuickStep, true},
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ORIGIN: {0, GasQuickStep, true},
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CALLER: {0, GasQuickStep, true},
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CALLVALUE: {0, GasQuickStep, true},
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CODESIZE: {0, GasQuickStep, true},
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GASPRICE: {0, GasQuickStep, true},
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COINBASE: {0, GasQuickStep, true},
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TIMESTAMP: {0, GasQuickStep, true},
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NUMBER: {0, GasQuickStep, true},
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CALLDATASIZE: {0, GasQuickStep, true},
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DIFFICULTY: {0, GasQuickStep, true},
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GASLIMIT: {0, GasQuickStep, true},
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POP: {1, GasQuickStep, false},
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PC: {0, GasQuickStep, true},
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MSIZE: {0, GasQuickStep, true},
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GAS: {0, GasQuickStep, true},
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BLOCKHASH: {1, GasExtStep, true},
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BALANCE: {1, GasExtStep, true},
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EXTCODESIZE: {1, GasExtStep, true},
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EXTCODECOPY: {4, GasExtStep, false},
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SLOAD: {1, params.SloadGas, true},
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SSTORE: {2, Zero, false},
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SHA3: {2, params.Sha3Gas, true},
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CREATE: {3, params.CreateGas, true},
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CALL: {7, params.CallGas, true},
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CALLCODE: {7, params.CallGas, true},
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JUMPDEST: {0, params.JumpdestGas, false},
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SUICIDE: {1, Zero, false},
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RETURN: {2, Zero, false},
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PUSH1: {0, GasFastestStep, true},
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DUP1: {0, Zero, true},
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}
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