bsc/core/vm/gas.go

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