c12f4df910
Reworked the EVM gas instructions to use 64bit integers rather than arbitrary size big ints. All gas operations, be it additions, multiplications or divisions, are checked and guarded against 64 bit integer overflows. In additon, most of the protocol paramaters in the params package have been converted to uint64 and are now constants rather than variables. * common/math: added overflow check ops * core: vmenv, env renamed to evm * eth, internal/ethapi, les: unmetered eth_call and cancel methods * core/vm: implemented big.Int pool for evm instructions * core/vm: unexported intPool methods & verification methods * core/vm: added memoryGasCost overflow check and test
29 lines
555 B
Go
29 lines
555 B
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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)
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func makeStackFunc(pop, push int) stackValidationFunc {
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return func(stack *Stack) error {
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if err := stack.require(pop); err != nil {
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return err
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}
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if stack.len()+push-pop > int(params.StackLimit) {
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return fmt.Errorf("stack limit reached %d (%d)", stack.len(), params.StackLimit)
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}
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return nil
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}
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}
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func makeDupStackFunc(n int) stackValidationFunc {
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return makeStackFunc(n, n+1)
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}
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func makeSwapStackFunc(n int) stackValidationFunc {
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return makeStackFunc(n, n)
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}
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