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Rename FunctionType::Location to FunctionType::Kind

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This commit is contained in:
Alex Beregszaszi 2017-02-11 03:13:36 +00:00
parent e7e22c703c
commit 7123f25210
2 changed files with 99 additions and 100 deletions
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178
libsolidity/ast/Types.cpp
View File

@ -1967,7 +1967,7 @@ TypePointer TupleType::closestTemporaryType(TypePointer const& _targetType) cons
} }
FunctionType::FunctionType(FunctionDefinition const& _function, bool _isInternal): FunctionType::FunctionType(FunctionDefinition const& _function, bool _isInternal):
m_location(_isInternal ? Location::Internal : Location::External), m_kind(_isInternal ? Kind::Internal : Kind::External),
m_isConstant(_function.isDeclaredConst()), m_isConstant(_function.isDeclaredConst()),
m_isPayable(_isInternal ? false : _function.isPayable()), m_isPayable(_isInternal ? false : _function.isPayable()),
m_declaration(&_function) m_declaration(&_function)
@ -1998,7 +1998,7 @@ FunctionType::FunctionType(FunctionDefinition const& _function, bool _isInternal
} }
FunctionType::FunctionType(VariableDeclaration const& _varDecl): FunctionType::FunctionType(VariableDeclaration const& _varDecl):
m_location(Location::External), m_isConstant(true), m_declaration(&_varDecl) m_kind(Kind::External), m_isConstant(true), m_declaration(&_varDecl)
{ {
TypePointers paramTypes; TypePointers paramTypes;
vector<string> paramNames; vector<string> paramNames;
@ -2058,7 +2058,7 @@ FunctionType::FunctionType(VariableDeclaration const& _varDecl):
} }
FunctionType::FunctionType(EventDefinition const& _event): FunctionType::FunctionType(EventDefinition const& _event):
m_location(Location::Event), m_isConstant(true), m_declaration(&_event) m_kind(Kind::Event), m_isConstant(true), m_declaration(&_event)
{ {
TypePointers params; TypePointers params;
vector<string> paramNames; vector<string> paramNames;
@ -2074,19 +2074,19 @@ FunctionType::FunctionType(EventDefinition const& _event):
} }
FunctionType::FunctionType(FunctionTypeName const& _typeName): FunctionType::FunctionType(FunctionTypeName const& _typeName):
m_location(_typeName.visibility() == VariableDeclaration::Visibility::External ? Location::External : Location::Internal), m_kind(_typeName.visibility() == VariableDeclaration::Visibility::External ? Kind::External : Kind::Internal),
m_isConstant(_typeName.isDeclaredConst()), m_isConstant(_typeName.isDeclaredConst()),
m_isPayable(_typeName.isPayable()) m_isPayable(_typeName.isPayable())
{ {
if (_typeName.isPayable()) if (_typeName.isPayable())
{ {
solAssert(m_location == Location::External, "Internal payable function type used."); solAssert(m_kind == Kind::External, "Internal payable function type used.");
solAssert(!m_isConstant, "Payable constant function"); solAssert(!m_isConstant, "Payable constant function");
} }
for (auto const& t: _typeName.parameterTypes()) for (auto const& t: _typeName.parameterTypes())
{ {
solAssert(t->annotation().type, "Type not set for parameter."); solAssert(t->annotation().type, "Type not set for parameter.");
if (m_location == Location::External) if (m_kind == Kind::External)
solAssert( solAssert(
t->annotation().type->canBeUsedExternally(false), t->annotation().type->canBeUsedExternally(false),
"Internal type used as parameter for external function." "Internal type used as parameter for external function."
@ -2096,7 +2096,7 @@ FunctionType::FunctionType(FunctionTypeName const& _typeName):
for (auto const& t: _typeName.returnParameterTypes()) for (auto const& t: _typeName.returnParameterTypes())
{ {
solAssert(t->annotation().type, "Type not set for return parameter."); solAssert(t->annotation().type, "Type not set for return parameter.");
if (m_location == Location::External) if (m_kind == Kind::External)
solAssert( solAssert(
t->annotation().type->canBeUsedExternally(false), t->annotation().type->canBeUsedExternally(false),
"Internal type used as return parameter for external function." "Internal type used as return parameter for external function."
@ -2126,7 +2126,7 @@ FunctionTypePointer FunctionType::newExpressionType(ContractDefinition const& _c
TypePointers{make_shared<ContractType>(_contract)}, TypePointers{make_shared<ContractType>(_contract)},
parameterNames, parameterNames,
strings{""}, strings{""},
Location::Creation, Kind::Creation,
false, false,
nullptr, nullptr,
false, false,
@ -2151,38 +2151,38 @@ TypePointers FunctionType::parameterTypes() const
string FunctionType::identifier() const string FunctionType::identifier() const
{ {
string id = "t_function_"; string id = "t_function_";
switch (location()) switch (m_kind)
{ {
case Location::Internal: id += "internal"; break; case Kind::Internal: id += "internal"; break;
case Location::External: id += "external"; break; case Kind::External: id += "external"; break;
case Location::CallCode: id += "callcode"; break; case Kind::CallCode: id += "callcode"; break;
case Location::DelegateCall: id += "delegatecall"; break; case Kind::DelegateCall: id += "delegatecall"; break;
case Location::Bare: id += "bare"; break; case Kind::Bare: id += "bare"; break;
case Location::BareCallCode: id += "barecallcode"; break; case Kind::BareCallCode: id += "barecallcode"; break;
case Location::BareDelegateCall: id += "baredelegatecall"; break; case Kind::BareDelegateCall: id += "baredelegatecall"; break;
case Location::Creation: id += "creation"; break; case Kind::Creation: id += "creation"; break;
case Location::Send: id += "send"; break; case Kind::Send: id += "send"; break;
case Location::Transfer: id += "transfer"; break; case Kind::Transfer: id += "transfer"; break;
case Location::SHA3: id += "sha3"; break; case Kind::SHA3: id += "sha3"; break;
case Location::Selfdestruct: id += "selfdestruct"; break; case Kind::Selfdestruct: id += "selfdestruct"; break;
case Location::Revert: id += "revert"; break; case Kind::Revert: id += "revert"; break;
case Location::ECRecover: id += "ecrecover"; break; case Kind::ECRecover: id += "ecrecover"; break;
case Location::SHA256: id += "sha256"; break; case Kind::SHA256: id += "sha256"; break;
case Location::RIPEMD160: id += "ripemd160"; break; case Kind::RIPEMD160: id += "ripemd160"; break;
case Location::Log0: id += "log0"; break; case Kind::Log0: id += "log0"; break;
case Location::Log1: id += "log1"; break; case Kind::Log1: id += "log1"; break;
case Location::Log2: id += "log2"; break; case Kind::Log2: id += "log2"; break;
case Location::Log3: id += "log3"; break; case Kind::Log3: id += "log3"; break;
case Location::Log4: id += "log4"; break; case Kind::Log4: id += "log4"; break;
case Location::Event: id += "event"; break; case Kind::Event: id += "event"; break;
case Location::SetGas: id += "setgas"; break; case Kind::SetGas: id += "setgas"; break;
case Location::SetValue: id += "setvalue"; break; case Kind::SetValue: id += "setvalue"; break;
case Location::BlockHash: id += "blockhash"; break; case Kind::BlockHash: id += "blockhash"; break;
case Location::AddMod: id += "addmod"; break; case Kind::AddMod: id += "addmod"; break;
case Location::MulMod: id += "mulmod"; break; case Kind::MulMod: id += "mulmod"; break;
case Location::ArrayPush: id += "arraypush"; break; case Kind::ArrayPush: id += "arraypush"; break;
case Location::ByteArrayPush: id += "bytearraypush"; break; case Kind::ByteArrayPush: id += "bytearraypush"; break;
case Location::ObjectCreation: id += "objectcreation"; break; case Kind::ObjectCreation: id += "objectcreation"; break;
default: solAssert(false, "Unknown function location."); break; default: solAssert(false, "Unknown function location."); break;
} }
if (isConstant()) if (isConstant())
@ -2203,7 +2203,7 @@ bool FunctionType::operator==(Type const& _other) const
return false; return false;
FunctionType const& other = dynamic_cast<FunctionType const&>(_other); FunctionType const& other = dynamic_cast<FunctionType const&>(_other);
if (m_location != other.m_location) if (m_kind != other.m_kind)
return false; return false;
if (m_isConstant != other.isConstant()) if (m_isConstant != other.isConstant())
return false; return false;
@ -2231,7 +2231,7 @@ bool FunctionType::operator==(Type const& _other) const
bool FunctionType::isExplicitlyConvertibleTo(Type const& _convertTo) const bool FunctionType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{ {
if (m_location == Location::External && _convertTo.category() == Category::Integer) if (m_kind == Kind::External && _convertTo.category() == Category::Integer)
{ {
IntegerType const& convertTo = dynamic_cast<IntegerType const&>(_convertTo); IntegerType const& convertTo = dynamic_cast<IntegerType const&>(_convertTo);
if (convertTo.isAddress()) if (convertTo.isAddress())
@ -2249,7 +2249,7 @@ TypePointer FunctionType::unaryOperatorResult(Token::Value _operator) const
string FunctionType::canonicalName(bool) const string FunctionType::canonicalName(bool) const
{ {
solAssert(m_location == Location::External, ""); solAssert(m_kind == Kind::External, "");
return "function"; return "function";
} }
@ -2263,7 +2263,7 @@ string FunctionType::toString(bool _short) const
name += " constant"; name += " constant";
if (m_isPayable) if (m_isPayable)
name += " payable"; name += " payable";
if (m_location == Location::External) if (m_kind == Kind::External)
name += " external"; name += " external";
if (!m_returnParameterTypes.empty()) if (!m_returnParameterTypes.empty())
{ {
@ -2285,7 +2285,7 @@ unsigned FunctionType::calldataEncodedSize(bool _padded) const
u256 FunctionType::storageSize() const u256 FunctionType::storageSize() const
{ {
if (m_location == Location::External || m_location == Location::Internal) if (m_kind == Kind::External || m_kind == Kind::Internal)
return 1; return 1;
else else
BOOST_THROW_EXCEPTION( BOOST_THROW_EXCEPTION(
@ -2295,9 +2295,9 @@ u256 FunctionType::storageSize() const
unsigned FunctionType::storageBytes() const unsigned FunctionType::storageBytes() const
{ {
if (m_location == Location::External) if (m_kind == Kind::External)
return 20 + 4; return 20 + 4;
else if (m_location == Location::Internal) else if (m_kind == Kind::Internal)
return 8; // it should really not be possible to create larger programs return 8; // it should really not be possible to create larger programs
else else
BOOST_THROW_EXCEPTION( BOOST_THROW_EXCEPTION(
@ -2307,21 +2307,21 @@ unsigned FunctionType::storageBytes() const
unsigned FunctionType::sizeOnStack() const unsigned FunctionType::sizeOnStack() const
{ {
Location location = m_location; Kind kind = m_kind;
if (m_location == Location::SetGas || m_location == Location::SetValue) if (m_kind == Kind::SetGas || m_kind == Kind::SetValue)
{ {
solAssert(m_returnParameterTypes.size() == 1, ""); solAssert(m_returnParameterTypes.size() == 1, "");
location = dynamic_cast<FunctionType const&>(*m_returnParameterTypes.front()).m_location; kind = dynamic_cast<FunctionType const&>(*m_returnParameterTypes.front()).m_kind;
} }
unsigned size = 0; unsigned size = 0;
if (location == Location::External || location == Location::CallCode || location == Location::DelegateCall) if (kind == Kind::External || kind == Kind::CallCode || kind == Kind::DelegateCall)
size = 2; size = 2;
else if (location == Location::Bare || location == Location::BareCallCode || location == Location::BareDelegateCall) else if (kind == Kind::Bare || kind == Kind::BareCallCode || kind == Kind::BareDelegateCall)
size = 1; size = 1;
else if (location == Location::Internal) else if (kind == Kind::Internal)
size = 1; size = 1;
else if (location == Location::ArrayPush || location == Location::ByteArrayPush) else if (kind == Kind::ArrayPush || kind == Kind::ByteArrayPush)
size = 1; size = 1;
if (m_gasSet) if (m_gasSet)
size++; size++;
@ -2362,26 +2362,26 @@ FunctionTypePointer FunctionType::interfaceFunctionType() const
return make_shared<FunctionType>( return make_shared<FunctionType>(
paramTypes, retParamTypes, paramTypes, retParamTypes,
m_parameterNames, m_returnParameterNames, m_parameterNames, m_returnParameterNames,
m_location, m_arbitraryParameters, m_kind, m_arbitraryParameters,
m_declaration, m_isConstant, m_isPayable m_declaration, m_isConstant, m_isPayable
); );
} }
MemberList::MemberMap FunctionType::nativeMembers(ContractDefinition const*) const MemberList::MemberMap FunctionType::nativeMembers(ContractDefinition const*) const
{ {
switch (m_location) switch (m_kind)
{ {
case Location::External: case Kind::External:
case Location::Creation: case Kind::Creation:
case Location::ECRecover: case Kind::ECRecover:
case Location::SHA256: case Kind::SHA256:
case Location::RIPEMD160: case Kind::RIPEMD160:
case Location::Bare: case Kind::Bare:
case Location::BareCallCode: case Kind::BareCallCode:
case Location::BareDelegateCall: case Kind::BareDelegateCall:
{ {
MemberList::MemberMap members; MemberList::MemberMap members;
if (m_location != Location::BareDelegateCall && m_location != Location::DelegateCall) if (m_kind != Kind::BareDelegateCall && m_kind != Kind::DelegateCall)
{ {
if (m_isPayable) if (m_isPayable)
members.push_back(MemberList::Member( members.push_back(MemberList::Member(
@ -2391,7 +2391,7 @@ MemberList::MemberMap FunctionType::nativeMembers(ContractDefinition const*) con
TypePointers{copyAndSetGasOrValue(false, true)}, TypePointers{copyAndSetGasOrValue(false, true)},
strings(), strings(),
strings(), strings(),
Location::SetValue, Kind::SetValue,
false, false,
nullptr, nullptr,
false, false,
@ -2401,7 +2401,7 @@ MemberList::MemberMap FunctionType::nativeMembers(ContractDefinition const*) con
) )
)); ));
} }
if (m_location != Location::Creation) if (m_kind != Kind::Creation)
members.push_back(MemberList::Member( members.push_back(MemberList::Member(
"gas", "gas",
make_shared<FunctionType>( make_shared<FunctionType>(
@ -2409,7 +2409,7 @@ MemberList::MemberMap FunctionType::nativeMembers(ContractDefinition const*) con
TypePointers{copyAndSetGasOrValue(true, false)}, TypePointers{copyAndSetGasOrValue(true, false)},
strings(), strings(),
strings(), strings(),
Location::SetGas, Kind::SetGas,
false, false,
nullptr, nullptr,
false, false,
@ -2428,7 +2428,7 @@ MemberList::MemberMap FunctionType::nativeMembers(ContractDefinition const*) con
TypePointer FunctionType::encodingType() const TypePointer FunctionType::encodingType() const
{ {
// Only external functions can be encoded, internal functions cannot leave code boundaries. // Only external functions can be encoded, internal functions cannot leave code boundaries.
if (m_location == Location::External) if (m_kind == Kind::External)
return shared_from_this(); return shared_from_this();
else else
return TypePointer(); return TypePointer();
@ -2436,7 +2436,7 @@ TypePointer FunctionType::encodingType() const
TypePointer FunctionType::interfaceType(bool /*_inLibrary*/) const TypePointer FunctionType::interfaceType(bool /*_inLibrary*/) const
{ {
if (m_location == Location::External) if (m_kind == Kind::External)
return shared_from_this(); return shared_from_this();
else else
return TypePointer(); return TypePointer();
@ -2478,14 +2478,14 @@ bool FunctionType::hasEqualArgumentTypes(FunctionType const& _other) const
bool FunctionType::isBareCall() const bool FunctionType::isBareCall() const
{ {
switch (m_location) switch (m_kind)
{ {
case Location::Bare: case Kind::Bare:
case Location::BareCallCode: case Kind::BareCallCode:
case Location::BareDelegateCall: case Kind::BareDelegateCall:
case Location::ECRecover: case Kind::ECRecover:
case Location::SHA256: case Kind::SHA256:
case Location::RIPEMD160: case Kind::RIPEMD160:
return true; return true;
default: default:
return false; return false;
@ -2520,13 +2520,13 @@ u256 FunctionType::externalIdentifier() const
bool FunctionType::isPure() const bool FunctionType::isPure() const
{ {
return return
m_location == Location::SHA3 || m_kind == Kind::SHA3 ||
m_location == Location::ECRecover || m_kind == Kind::ECRecover ||
m_location == Location::SHA256 || m_kind == Kind::SHA256 ||
m_location == Location::RIPEMD160 || m_kind == Kind::RIPEMD160 ||
m_location == Location::AddMod || m_kind == Kind::AddMod ||
m_location == Location::MulMod || m_kind == Kind::MulMod ||
m_location == Location::ObjectCreation; m_kind == Kind::ObjectCreation;
} }
TypePointers FunctionType::parseElementaryTypeVector(strings const& _types) TypePointers FunctionType::parseElementaryTypeVector(strings const& _types)
@ -2545,7 +2545,7 @@ TypePointer FunctionType::copyAndSetGasOrValue(bool _setGas, bool _setValue) con
m_returnParameterTypes, m_returnParameterTypes,
m_parameterNames, m_parameterNames,
m_returnParameterNames, m_returnParameterNames,
m_location, m_kind,
m_arbitraryParameters, m_arbitraryParameters,
m_declaration, m_declaration,
m_isConstant, m_isConstant,
@ -2571,18 +2571,18 @@ FunctionTypePointer FunctionType::asMemberFunction(bool _inLibrary, bool _bound)
parameterTypes.push_back(t); parameterTypes.push_back(t);
} }
Location location = m_location; Kind kind = m_kind;
if (_inLibrary) if (_inLibrary)
{ {
solAssert(!!m_declaration, "Declaration has to be available."); solAssert(!!m_declaration, "Declaration has to be available.");
if (!m_declaration->isPublic()) if (!m_declaration->isPublic())
location = Location::Internal; // will be inlined kind = Kind::Internal; // will be inlined
else else
location = Location::DelegateCall; kind = Kind::DelegateCall;
} }
TypePointers returnParameterTypes = m_returnParameterTypes; TypePointers returnParameterTypes = m_returnParameterTypes;
if (location != Location::Internal) if (kind != Kind::Internal)
{ {
// Alter dynamic types to be non-accessible. // Alter dynamic types to be non-accessible.
for (auto& param: returnParameterTypes) for (auto& param: returnParameterTypes)
@ -2595,7 +2595,7 @@ FunctionTypePointer FunctionType::asMemberFunction(bool _inLibrary, bool _bound)
returnParameterTypes, returnParameterTypes,
m_parameterNames, m_parameterNames,
m_returnParameterNames, m_returnParameterNames,
location, kind,
m_arbitraryParameters, m_arbitraryParameters,
m_declaration, m_declaration,
m_isConstant, m_isConstant,

21
libsolidity/ast/Types.h
View File

@ -817,8 +817,7 @@ class FunctionType: public Type
{ {
public: public:
/// How this function is invoked on the EVM. /// How this function is invoked on the EVM.
/// @todo This documentation is outdated, and Location should rather be named "Type" enum class Kind
enum class Location
{ {
Internal, ///< stack-call using plain JUMP Internal, ///< stack-call using plain JUMP
External, ///< external call using CALL External, ///< external call using CALL
@ -868,7 +867,7 @@ public:
FunctionType( FunctionType(
strings const& _parameterTypes, strings const& _parameterTypes,
strings const& _returnParameterTypes, strings const& _returnParameterTypes,
Location _location = Location::Internal, Kind _kind = Kind::Internal,
bool _arbitraryParameters = false, bool _arbitraryParameters = false,
bool _constant = false, bool _constant = false,
bool _payable = false bool _payable = false
@ -877,7 +876,7 @@ public:
parseElementaryTypeVector(_returnParameterTypes), parseElementaryTypeVector(_returnParameterTypes),
strings(), strings(),
strings(), strings(),
_location, _kind,
_arbitraryParameters, _arbitraryParameters,
nullptr, nullptr,
_constant, _constant,
@ -895,7 +894,7 @@ public:
TypePointers const& _returnParameterTypes, TypePointers const& _returnParameterTypes,
strings _parameterNames = strings(), strings _parameterNames = strings(),
strings _returnParameterNames = strings(), strings _returnParameterNames = strings(),
Location _location = Location::Internal, Kind _kind = Kind::Internal,
bool _arbitraryParameters = false, bool _arbitraryParameters = false,
Declaration const* _declaration = nullptr, Declaration const* _declaration = nullptr,
bool _isConstant = false, bool _isConstant = false,
@ -908,7 +907,7 @@ public:
m_returnParameterTypes(_returnParameterTypes), m_returnParameterTypes(_returnParameterTypes),
m_parameterNames(_parameterNames), m_parameterNames(_parameterNames),
m_returnParameterNames(_returnParameterNames), m_returnParameterNames(_returnParameterNames),
m_location(_location), m_kind(_kind),
m_arbitraryParameters(_arbitraryParameters), m_arbitraryParameters(_arbitraryParameters),
m_gasSet(_gasSet), m_gasSet(_gasSet),
m_valueSet(_valueSet), m_valueSet(_valueSet),
@ -937,11 +936,11 @@ public:
virtual std::string canonicalName(bool /*_addDataLocation*/) const override; virtual std::string canonicalName(bool /*_addDataLocation*/) const override;
virtual std::string toString(bool _short) const override; virtual std::string toString(bool _short) const override;
virtual unsigned calldataEncodedSize(bool _padded) const override; virtual unsigned calldataEncodedSize(bool _padded) const override;
virtual bool canBeStored() const override { return m_location == Location::Internal || m_location == Location::External; } virtual bool canBeStored() const override { return m_kind == Kind::Internal || m_kind == Kind::External; }
virtual u256 storageSize() const override; virtual u256 storageSize() const override;
virtual unsigned storageBytes() const override; virtual unsigned storageBytes() const override;
virtual bool isValueType() const override { return true; } virtual bool isValueType() const override { return true; }
virtual bool canLiveOutsideStorage() const override { return m_location == Location::Internal || m_location == Location::External; } virtual bool canLiveOutsideStorage() const override { return m_kind == Kind::Internal || m_kind == Kind::External; }
virtual unsigned sizeOnStack() const override; virtual unsigned sizeOnStack() const override;
virtual MemberList::MemberMap nativeMembers(ContractDefinition const* _currentScope) const override; virtual MemberList::MemberMap nativeMembers(ContractDefinition const* _currentScope) const override;
virtual TypePointer encodingType() const override; virtual TypePointer encodingType() const override;
@ -964,7 +963,7 @@ public:
/// @returns true if the ABI is used for this call (only meaningful for external calls) /// @returns true if the ABI is used for this call (only meaningful for external calls)
bool isBareCall() const; bool isBareCall() const;
Location const& location() const { return m_location; } Kind const& kind() const { return m_kind; }
/// @returns the external signature of this function type given the function name /// @returns the external signature of this function type given the function name
std::string externalSignature() const; std::string externalSignature() const;
/// @returns the external identifier of this function (the hash of the signature). /// @returns the external identifier of this function (the hash of the signature).
@ -986,7 +985,7 @@ public:
ASTPointer<ASTString> documentation() const; ASTPointer<ASTString> documentation() const;
/// true iff arguments are to be padded to multiples of 32 bytes for external calls /// true iff arguments are to be padded to multiples of 32 bytes for external calls
bool padArguments() const { return !(m_location == Location::SHA3 || m_location == Location::SHA256 || m_location == Location::RIPEMD160); } bool padArguments() const { return !(m_kind == Kind::SHA3 || m_kind == Kind::SHA256 || m_kind == Kind::RIPEMD160); }
bool takesArbitraryParameters() const { return m_arbitraryParameters; } bool takesArbitraryParameters() const { return m_arbitraryParameters; }
bool gasSet() const { return m_gasSet; } bool gasSet() const { return m_gasSet; }
bool valueSet() const { return m_valueSet; } bool valueSet() const { return m_valueSet; }
@ -1012,7 +1011,7 @@ private:
TypePointers m_returnParameterTypes; TypePointers m_returnParameterTypes;
std::vector<std::string> m_parameterNames; std::vector<std::string> m_parameterNames;
std::vector<std::string> m_returnParameterNames; std::vector<std::string> m_returnParameterNames;
Location const m_location; Kind const m_kind;
/// true if the function takes an arbitrary number of arguments of arbitrary types /// true if the function takes an arbitrary number of arguments of arbitrary types
bool const m_arbitraryParameters = false; bool const m_arbitraryParameters = false;
bool const m_gasSet = false; ///< true iff the gas value to be used is on the stack bool const m_gasSet = false; ///< true iff the gas value to be used is on the stack