params: core, core/vm, miner: 64bit gas instructions

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

1 files changed, 2 insertions, 2 deletions

diff --git a/eth/bind.go b/eth/bind.go
index a9864b367..2ee9f2bf7 100644
--- a/eth/bind.go
+++ b/eth/bind.go
@@ -69,7 +69,7 @@ func (b *ContractBackend) PendingCodeAt(ctx context.Context, contract common.Add
 // against the pending block, not the stable head of the chain.
 func (b *ContractBackend) CallContract(ctx context.Context, msg ethereum.CallMsg, blockNum *big.Int) ([]byte, error) {
 	out, err := b.bcapi.Call(ctx, toCallArgs(msg), toBlockNumber(blockNum))
-	return common.FromHex(out), err
+	return out, err
 }
 
 // ContractCall implements bind.ContractCaller executing an Ethereum contract
@@ -77,7 +77,7 @@ func (b *ContractBackend) CallContract(ctx context.Context, msg ethereum.CallMsg
 // against the pending block, not the stable head of the chain.
 func (b *ContractBackend) PendingCallContract(ctx context.Context, msg ethereum.CallMsg) ([]byte, error) {
 	out, err := b.bcapi.Call(ctx, toCallArgs(msg), rpc.PendingBlockNumber)
-	return common.FromHex(out), err
+	return out, err
 }
 
 func toCallArgs(msg ethereum.CallMsg) ethapi.CallArgs {