cerc-io/solidity
16
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Fallback takes constant amount of gas, and send to gas with send.

Browse Source
This commit is contained in:
chriseth 2015-06-05 12:25:10 +02:00
parent 92eb04c6ec
commit 6667c67364
2 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
Compiler.cpp
View File

@ -174,6 +174,16 @@ void Compiler::appendFunctionSelector(ContractDefinition const& _contract)
map<FixedHash<4>, FunctionTypePointer> interfaceFunctions = _contract.getInterfaceFunctions();
map<FixedHash<4>, const eth::AssemblyItem> callDataUnpackerEntryPoints;
FunctionDefinition const* fallback = _contract.getFallbackFunction();
eth::AssemblyItem notFound = m_context.newTag();
// shortcut messages without data if we have many functions in order to be able to receive
// ether with constant gas
if (interfaceFunctions.size() > 5 || fallback)
{
m_context << eth::Instruction::CALLDATASIZE << eth::Instruction::ISZERO;
m_context.appendConditionalJumpTo(notFound);
}
// retrieve the function signature hash from the calldata
if (!interfaceFunctions.empty())
CompilerUtils(m_context).loadFromMemory(0, IntegerType(CompilerUtils::dataStartOffset * 8), true);
@ -185,7 +195,10 @@ void Compiler::appendFunctionSelector(ContractDefinition const& _contract)
m_context << eth::dupInstruction(1) << u256(FixedHash<4>::Arith(it.first)) << eth::Instruction::EQ;
m_context.appendConditionalJumpTo(callDataUnpackerEntryPoints.at(it.first));
}
if (FunctionDefinition const* fallback = _contract.getFallbackFunction())
m_context.appendJumpTo(notFound);
m_context << notFound;
if (fallback)
{
eth::AssemblyItem returnTag = m_context.pushNewTag();
fallback->accept(*this);
@ -194,6 +207,7 @@ void Compiler::appendFunctionSelector(ContractDefinition const& _contract)
}
else
m_context << eth::Instruction::STOP; // function not found
for (auto const& it: interfaceFunctions)
{
FunctionTypePointer const& functionType = it.second;

3
ExpressionCompiler.cpp
View File

@ -521,6 +521,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
break;
case Location::Send:
_functionCall.getExpression().accept(*this);
m_context << u256(0); // do not send gas (there still is the stipend)
arguments.front()->accept(*this);
appendTypeConversion(*arguments.front()->getType(),
*function.getParameterTypes().front(), true);
@ -532,7 +533,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
strings(),
Location::Bare,
false,
false,
true,
true
),
{}