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Implement address.transfer()

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This commit is contained in:
Alex Beregszaszi 2017-02-05 20:21:14 +00:00
parent 0177d964b1
commit 4264625c69
4 changed files with 20 additions and 5 deletions
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1
Changelog.md
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@ -2,6 +2,7 @@
Features:
* Add ``assert(condition)``, which throws if condition is false.
* Introduce ``.transfer(value)`` for sending Ether.
* Code generator: Support ``revert()`` to abort with rolling back, but not consuming all gas.
* Inline assembly: Support ``revert`` (EIP140) as an opcode.
* Type system: Support explicit conversion of external function to address.

4
libsolidity/ast/Types.cpp
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@ -464,7 +464,8 @@ MemberList::MemberMap IntegerType::nativeMembers(ContractDefinition const*) cons
{"call", make_shared<FunctionType>(strings(), strings{"bool"}, FunctionType::Location::Bare, true, false, true)},
{"callcode", make_shared<FunctionType>(strings(), strings{"bool"}, FunctionType::Location::BareCallCode, true, false, true)},
{"delegatecall", make_shared<FunctionType>(strings(), strings{"bool"}, FunctionType::Location::BareDelegateCall, true)},
{"send", make_shared<FunctionType>(strings{"uint"}, strings{"bool"}, FunctionType::Location::Send)}
{"send", make_shared<FunctionType>(strings{"uint"}, strings{"bool"}, FunctionType::Location::Send)},
{"transfer", make_shared<FunctionType>(strings{"uint"}, strings(), FunctionType::Location::Transfer)}
};
else
return MemberList::MemberMap();
@ -2097,6 +2098,7 @@ string FunctionType::identifier() const
case Location::BareDelegateCall: id += "baredelegatecall"; break;
case Location::Creation: id += "creation"; break;
case Location::Send: id += "send"; break;
case Location::Transfer: id += "transfer"; break;
case Location::SHA3: id += "sha3"; break;
case Location::Selfdestruct: id += "selfdestruct"; break;
case Location::Revert: id += "revert"; break;

1
libsolidity/ast/Types.h
View File

@ -826,6 +826,7 @@ public:
BareDelegateCall, ///< DELEGATECALL without function hash
Creation, ///< external call using CREATE
Send, ///< CALL, but without data and gas
Transfer, ///< CALL, but without data and throws on error
SHA3, ///< SHA3
Selfdestruct, ///< SELFDESTRUCT
Revert, ///< REVERT

19
libsolidity/codegen/ExpressionCompiler.cpp
View File

@ -616,6 +616,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
arguments.front()->accept(*this);
break;
case Location::Send:
case Location::Transfer:
_functionCall.expression().accept(*this);
// Provide the gas stipend manually at first because we may send zero ether.
// Will be zeroed if we send more than zero ether.
@ -625,9 +626,12 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
*arguments.front()->annotation().type,
*function.parameterTypes().front(), true
);
// gas <- gas * !value
m_context << Instruction::SWAP1 << Instruction::DUP2;
m_context << Instruction::ISZERO << Instruction::MUL << Instruction::SWAP1;
if (function.location() != Location::Transfer)
{
// gas <- gas * !value
m_context << Instruction::SWAP1 << Instruction::DUP2;
m_context << Instruction::ISZERO << Instruction::MUL << Instruction::SWAP1;
}
appendExternalFunctionCall(
FunctionType(
TypePointers{},
@ -644,6 +648,12 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
),
{}
);
if (function.location() == Location::Transfer)
{
// Check if zero (out of stack or not enough balance).
m_context << Instruction::ISZERO;
m_context.appendConditionalInvalid();
}
break;
case Location::Selfdestruct:
arguments.front()->accept(*this);
@ -960,6 +970,7 @@ bool ExpressionCompiler::visit(MemberAccess const& _memberAccess)
case FunctionType::Location::Bare:
case FunctionType::Location::BareCallCode:
case FunctionType::Location::BareDelegateCall:
case FunctionType::Location::Transfer:
_memberAccess.expression().accept(*this);
m_context << funType->externalIdentifier();
break;
@ -1041,7 +1052,7 @@ bool ExpressionCompiler::visit(MemberAccess const& _memberAccess)
);
m_context << Instruction::BALANCE;
}
else if ((set<string>{"send", "call", "callcode", "delegatecall"}).count(member))
else if ((set<string>{"send", "transfer", "call", "callcode", "delegatecall"}).count(member))
utils().convertType(
*_memberAccess.expression().annotation().type,
IntegerType(0, IntegerType::Modifier::Address),