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Improved gas computation for CALLCODE.

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This commit is contained in:
chriseth 2015-07-28 13:37:38 +02:00
parent f2f1e03007
commit ac1a11634e
1 changed files with 10 additions and 2 deletions
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12
ExpressionCompiler.cpp
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@ -1072,6 +1072,7 @@ void ExpressionCompiler::appendExternalFunctionCall(
using FunctionKind = FunctionType::Location;
FunctionKind funKind = _functionType.getLocation();
bool returnSuccessCondition = funKind == FunctionKind::Bare || funKind == FunctionKind::BareCallCode;
bool isCallCode = funKind == FunctionKind::BareCallCode || funKind == FunctionKind::CallCode;
//@todo only return the first return value for now
Type const* firstReturnType =
@ -1158,13 +1159,20 @@ void ExpressionCompiler::appendExternalFunctionCall(
if (_functionType.gasSet())
m_context << eth::dupInstruction(m_context.baseToCurrentStackOffset(gasStackPos));
else
{
// send all gas except the amount needed to execute "SUB" and "CALL"
// @todo this retains too much gas for now, needs to be fine-tuned.
u256 gasNeededByCaller = eth::c_callGas + 10;
if (_functionType.valueSet())
gasNeededByCaller += eth::c_callValueTransferGas;
if (!isCallCode)
gasNeededByCaller += eth::c_callNewAccountGas; // we never know
m_context <<
u256(eth::c_callGas + 10 + (_functionType.valueSet() ? eth::c_callValueTransferGas : 0) + eth::c_callNewAccountGas) <<
gasNeededByCaller <<
eth::Instruction::GAS <<
eth::Instruction::SUB;
if (funKind == FunctionKind::CallCode || funKind == FunctionKind::BareCallCode)
}
if (isCallCode)
m_context << eth::Instruction::CALLCODE;
else
m_context << eth::Instruction::CALL;