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Arbitrary precision integer constants.

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This commit is contained in:
Christian 2014-12-19 11:31:17 +01:00
parent be1e89da42
commit be623273f3
6 changed files with 233 additions and 57 deletions
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20
AST.cpp
View File

@ -174,7 +174,15 @@ void VariableDefinition::checkTypeRequirements()
{
// no type declared and no previous assignment, infer the type
m_value->checkTypeRequirements();
m_variable->setType(m_value->getType());
TypePointer type = m_value->getType();
if (type->getCategory() == Type::Category::INTEGER_CONSTANT)
{
auto intType = dynamic_pointer_cast<IntegerConstantType const>(type)->getIntegerType();
if (!intType)
BOOST_THROW_EXCEPTION(m_value->createTypeError("Invalid integer constant " + type->toString()));
type = intType;
}
m_variable->setType(type);
}
}
}
@ -196,13 +204,19 @@ void Assignment::checkTypeRequirements()
TypePointer resultType = m_type->binaryOperatorResult(Token::AssignmentToBinaryOp(m_assigmentOperator),
m_rightHandSide->getType());
if (!resultType || *resultType != *m_type)
BOOST_THROW_EXCEPTION(createTypeError("Operator not compatible with type."));
BOOST_THROW_EXCEPTION(createTypeError("Operator " + string(Token::toString(m_assigmentOperator)) +
" not compatible with types " +
m_type->toString() + " and " +
m_rightHandSide->getType()->toString()));
}
}
void ExpressionStatement::checkTypeRequirements()
{
m_expression->checkTypeRequirements();
if (m_expression->getType()->getCategory() == Type::Category::INTEGER_CONSTANT)
if (!dynamic_pointer_cast<IntegerConstantType const>(m_expression->getType())->getIntegerType())
BOOST_THROW_EXCEPTION(m_expression->createTypeError("Invalid integer constant."));
}
void Expression::expectType(Type const& _expectedType)
@ -388,7 +402,7 @@ void Literal::checkTypeRequirements()
{
m_type = Type::forLiteral(*this);
if (!m_type)
BOOST_THROW_EXCEPTION(createTypeError("Literal value too large."));
BOOST_THROW_EXCEPTION(createTypeError("Invalid literal value."));
}
}

42
ExpressionCompiler.cpp
View File

@ -71,12 +71,20 @@ bool ExpressionCompiler::visit(Assignment const& _assignment)
return false;
}
void ExpressionCompiler::endVisit(UnaryOperation const& _unaryOperation)
bool ExpressionCompiler::visit(UnaryOperation const& _unaryOperation)
{
//@todo type checking and creating code for an operator should be in the same place:
// the operator should know how to convert itself and to which types it applies, so
// put this code together with "Type::acceptsBinary/UnaryOperator" into a class that
// represents the operator
if (_unaryOperation.getType()->getCategory() == Type::Category::INTEGER_CONSTANT)
{
m_context << _unaryOperation.getType()->literalValue(nullptr);
return false;
}
_unaryOperation.getSubExpression().accept(*this);
switch (_unaryOperation.getOperator())
{
case Token::NOT: // !
@ -128,6 +136,7 @@ void ExpressionCompiler::endVisit(UnaryOperation const& _unaryOperation)
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Invalid unary operator: " +
string(Token::toString(_unaryOperation.getOperator()))));
}
return false;
}
bool ExpressionCompiler::visit(BinaryOperation const& _binaryOperation)
@ -139,17 +148,19 @@ bool ExpressionCompiler::visit(BinaryOperation const& _binaryOperation)
if (op == Token::AND || op == Token::OR) // special case: short-circuiting
appendAndOrOperatorCode(_binaryOperation);
else if (commonType.getCategory() == Type::Category::INTEGER_CONSTANT)
m_context << commonType.literalValue(nullptr);
else
{
bool cleanupNeeded = false;
if (commonType.getCategory() == Type::Category::INTEGER)
if (Token::isCompareOp(op) || op == Token::DIV || op == Token::MOD)
cleanupNeeded = true;
bool cleanupNeeded = commonType.getCategory() == Type::Category::INTEGER &&
(Token::isCompareOp(op) || op == Token::DIV || op == Token::MOD);
// for commutative operators, push the literal as late as possible to allow improved optimization
//@todo this has to be extended for literal expressions
bool swap = (m_optimize && Token::isCommutativeOp(op) && dynamic_cast<Literal const*>(&rightExpression)
&& !dynamic_cast<Literal const*>(&leftExpression));
auto isLiteral = [](Expression const& _e)
{
return dynamic_cast<Literal const*>(&_e) || _e.getType()->getCategory() == Type::Category::INTEGER_CONSTANT;
};
bool swap = m_optimize && Token::isCommutativeOp(op) && isLiteral(rightExpression) && !isLiteral(leftExpression);
if (swap)
{
leftExpression.accept(*this);
@ -478,10 +489,10 @@ void ExpressionCompiler::endVisit(Literal const& _literal)
{
switch (_literal.getType()->getCategory())
{
case Type::Category::INTEGER:
case Type::Category::INTEGER_CONSTANT:
case Type::Category::BOOL:
case Type::Category::STRING:
m_context << _literal.getType()->literalValue(_literal);
m_context << _literal.getType()->literalValue(&_literal);
break;
default:
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Only integer, boolean and string literals implemented for now."));
@ -617,9 +628,16 @@ void ExpressionCompiler::appendTypeConversion(Type const& _typeOnStack, Type con
if (_typeOnStack == _targetType && !_cleanupNeeded)
return;
if (_typeOnStack.getCategory() == Type::Category::INTEGER)
Type::Category stackTypeCategory = _typeOnStack.getCategory();
Type::Category targetTypeCategory = _targetType.getCategory();
if (stackTypeCategory == Type::Category::INTEGER)
{
solAssert(targetTypeCategory == Type::Category::INTEGER || targetTypeCategory == Type::Category::CONTRACT, "");
appendHighBitsCleanup(dynamic_cast<IntegerType const&>(_typeOnStack));
else if (_typeOnStack.getCategory() == Type::Category::STRING)
}
else if (stackTypeCategory == Type::Category::INTEGER_CONSTANT)
solAssert(targetTypeCategory == Type::Category::INTEGER || targetTypeCategory == Type::Category::CONTRACT, "");
else if (stackTypeCategory == Type::Category::STRING)
{
// nothing to do, strings are high-order-bit-aligned
//@todo clear lower-order bytes if we allow explicit conversion to shorter strings

2
ExpressionCompiler.h
View File

@ -58,7 +58,7 @@ private:
m_optimize(_optimize), m_context(_compilerContext), m_currentLValue(m_context) {}
virtual bool visit(Assignment const& _assignment) override;
virtual void endVisit(UnaryOperation const& _unaryOperation) override;
virtual bool visit(UnaryOperation const& _unaryOperation) override;
virtual bool visit(BinaryOperation const& _binaryOperation) override;
virtual bool visit(FunctionCall const& _functionCall) override;
virtual bool visit(NewExpression const& _newExpression) override;

7
Scanner.cpp
View File

@ -455,7 +455,7 @@ void Scanner::scanToken()
token = Token::ADD;
break;
case '-':
// - -- -= Number
// - -- -=
advance();
if (m_char == '-')
{
@ -464,8 +464,6 @@ void Scanner::scanToken()
}
else if (m_char == '=')
token = selectToken(Token::ASSIGN_SUB);
else if (m_char == '.' || isDecimalDigit(m_char))
token = scanNumber('-');
else
token = Token::SUB;
break;
@ -650,8 +648,7 @@ Token::Value Scanner::scanNumber(char _charSeen)
}
else
{
if (_charSeen == '-')
addLiteralChar('-');
solAssert(_charSeen == 0, "");
// if the first character is '0' we must check for octals and hex
if (m_char == '0')
{

172
Types.cpp
View File

@ -91,7 +91,7 @@ shared_ptr<Type const> Type::forLiteral(Literal const& _literal)
case Token::FALSE_LITERAL:
return make_shared<BoolType const>();
case Token::NUMBER:
return IntegerType::smallestTypeForLiteral(_literal.getValue());
return IntegerConstantType::fromLiteral(_literal.getValue());
case Token::STRING_LITERAL:
//@todo put larger strings into dynamic strings
return StaticStringType::smallestTypeForLiteral(_literal.getValue());
@ -112,19 +112,6 @@ TypePointer Type::commonType(TypePointer const& _a, TypePointer const& _b)
const MemberList Type::EmptyMemberList = MemberList();
shared_ptr<IntegerType const> IntegerType::smallestTypeForLiteral(string const& _literal)
{
bigint value(_literal);
bool isSigned = value < 0 || (!_literal.empty() && _literal.front() == '-');
if (isSigned)
// convert to positive number of same bit requirements
value = ((-value) - 1) << 1;
unsigned bytes = max(bytesRequired(value), 1u);
if (bytes > 32)
return shared_ptr<IntegerType const>();
return make_shared<IntegerType const>(bytes * 8, isSigned ? Modifier::SIGNED : Modifier::UNSIGNED);
}
IntegerType::IntegerType(int _bits, IntegerType::Modifier _modifier):
m_bits(_bits), m_modifier(_modifier)
{
@ -194,15 +181,9 @@ string IntegerType::toString() const
return prefix + dev::toString(m_bits);
}
u256 IntegerType::literalValue(Literal const& _literal) const
{
bigint value(_literal.getValue());
return u256(value);
}
TypePointer IntegerType::binaryOperatorResult(Token::Value _operator, TypePointer const& _other) const
{
if (getCategory() != _other->getCategory())
if (_other->getCategory() != Category::INTEGER_CONSTANT && _other->getCategory() != getCategory())
return TypePointer();
auto commonType = dynamic_pointer_cast<IntegerType const>(Type::commonType(shared_from_this(), _other));
@ -236,6 +217,141 @@ const MemberList IntegerType::AddressMemberList =
make_shared<FunctionType const>(TypePointers({make_shared<IntegerType const>(256)}),
TypePointers(), FunctionType::Location::SEND)}});
shared_ptr<IntegerConstantType const> IntegerConstantType::fromLiteral(string const& _literal)
{
return make_shared<IntegerConstantType const>(bigint(_literal));
}
bool IntegerConstantType::isImplicitlyConvertibleTo(Type const& _convertTo) const
{
TypePointer integerType = getIntegerType();
return integerType && integerType->isImplicitlyConvertibleTo(_convertTo);
}
bool IntegerConstantType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{
TypePointer integerType = getIntegerType();
return integerType && integerType->isExplicitlyConvertibleTo(_convertTo);
}
TypePointer IntegerConstantType::unaryOperatorResult(Token::Value _operator) const
{
bigint value;
switch (_operator)
{
case Token::BIT_NOT:
value = ~m_value;
break;
case Token::ADD:
value = m_value;
break;
case Token::SUB:
value = -m_value;
break;
default:
return TypePointer();
}
return make_shared<IntegerConstantType const>(value);
}
TypePointer IntegerConstantType::binaryOperatorResult(Token::Value _operator, TypePointer const& _other) const
{
if (_other->getCategory() == Category::INTEGER)
{
shared_ptr<IntegerType const> integerType = getIntegerType();
if (!integerType)
return TypePointer();
return integerType->binaryOperatorResult(_operator, _other);
}
else if (_other->getCategory() != getCategory())
return TypePointer();
IntegerConstantType const& other = dynamic_cast<IntegerConstantType const&>(*_other);
if (Token::isCompareOp(_operator))
{
shared_ptr<IntegerType const> thisIntegerType = getIntegerType();
shared_ptr<IntegerType const> otherIntegerType = other.getIntegerType();
if (!thisIntegerType || !otherIntegerType)
return TypePointer();
return thisIntegerType->binaryOperatorResult(_operator, otherIntegerType);
}
else
{
bigint value;
switch (_operator)
{
case Token::BIT_OR:
value = m_value | other.m_value;
break;
case Token::BIT_XOR:
value = m_value ^ other.m_value;
break;
case Token::BIT_AND:
value = m_value & other.m_value;
break;
case Token::ADD:
value = m_value + other.m_value;
break;
case Token::SUB:
value = m_value - other.m_value;
break;
case Token::MUL:
value = m_value * other.m_value;
break;
case Token::DIV:
if (other.m_value == 0)
return TypePointer();
value = m_value / other.m_value;
break;
case Token::MOD:
if (other.m_value == 0)
return TypePointer();
value = m_value % other.m_value;
break;
default:
return TypePointer();
}
return make_shared<IntegerConstantType const>(value);
}
}
bool IntegerConstantType::operator==(Type const& _other) const
{
if (_other.getCategory() != getCategory())
return false;
return m_value == dynamic_cast<IntegerConstantType const&>(_other).m_value;
}
string IntegerConstantType::toString() const
{
return "int_const " + m_value.str();
}
u256 IntegerConstantType::literalValue(Literal const*) const
{
// we ignore the literal and hope that the type was correctly determined
solAssert(m_value <= u256(-1), "Integer constant too large.");
solAssert(m_value >= -(bigint(1) << 255), "Integer constant too small.");
if (m_value >= 0)
return u256(m_value);
else
return s2u(s256(m_value));
}
shared_ptr<IntegerType const> IntegerConstantType::getIntegerType() const
{
bigint value = m_value;
bool negative = (value < 0);
if (negative) // convert to positive number of same bit requirements
value = ((-value) - 1) << 1;
if (value > u256(-1))
return shared_ptr<IntegerType const>();
else
return make_shared<IntegerType const>(max(bytesRequired(value), 1u) * 8,
negative ? IntegerType::Modifier::SIGNED
: IntegerType::Modifier::UNSIGNED);
}
shared_ptr<StaticStringType> StaticStringType::smallestTypeForLiteral(string const& _literal)
{
if (_literal.length() <= 32)
@ -265,12 +381,13 @@ bool StaticStringType::operator==(Type const& _other) const
return other.m_bytes == m_bytes;
}
u256 StaticStringType::literalValue(const Literal& _literal) const
u256 StaticStringType::literalValue(const Literal* _literal) const
{
solAssert(_literal, "");
u256 value = 0;
for (char c: _literal.getValue())
for (char c: _literal->getValue())
value = (value << 8) | byte(c);
return value << ((32 - _literal.getValue().length()) * 8);
return value << ((32 - _literal->getValue().length()) * 8);
}
bool BoolType::isExplicitlyConvertibleTo(Type const& _convertTo) const
@ -286,11 +403,12 @@ bool BoolType::isExplicitlyConvertibleTo(Type const& _convertTo) const
return isImplicitlyConvertibleTo(_convertTo);
}
u256 BoolType::literalValue(Literal const& _literal) const
u256 BoolType::literalValue(Literal const* _literal) const
{
if (_literal.getToken() == Token::TRUE_LITERAL)
solAssert(_literal, "");
if (_literal->getToken() == Token::TRUE_LITERAL)
return u256(1);
else if (_literal.getToken() == Token::FALSE_LITERAL)
else if (_literal->getToken() == Token::FALSE_LITERAL)
return u256(0);
else
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Bool type constructed from non-boolean literal."));

47
Types.h
View File

@ -75,7 +75,7 @@ class Type: private boost::noncopyable, public std::enable_shared_from_this<Type
public:
enum class Category
{
INTEGER, BOOL, REAL, STRING, CONTRACT, STRUCT, FUNCTION, MAPPING, VOID, TYPE, MAGIC
INTEGER, INTEGER_CONSTANT, BOOL, REAL, STRING, CONTRACT, STRUCT, FUNCTION, MAPPING, VOID, TYPE, MAGIC
};
///@{
@ -135,7 +135,7 @@ public:
TypePointer getMemberType(std::string const& _name) const { return getMembers().getMemberType(_name); }
virtual std::string toString() const = 0;
virtual u256 literalValue(Literal const&) const
virtual u256 literalValue(Literal const*) const
{
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Literal value requested "
"for type without literals."));
@ -158,10 +158,6 @@ public:
};
virtual Category getCategory() const override { return Category::INTEGER; }
/// @returns the smallest integer type for the given literal or an empty pointer
/// if no type fits.
static std::shared_ptr<IntegerType const> smallestTypeForLiteral(std::string const& _literal);
explicit IntegerType(int _bits, Modifier _modifier = Modifier::UNSIGNED);
virtual bool isImplicitlyConvertibleTo(Type const& _convertTo) const override;
@ -177,7 +173,6 @@ public:
virtual MemberList const& getMembers() const { return isAddress() ? AddressMemberList : EmptyMemberList; }
virtual std::string toString() const override;
virtual u256 literalValue(Literal const& _literal) const override;
int getNumBits() const { return m_bits; }
bool isHash() const { return m_modifier == Modifier::HASH || m_modifier == Modifier::ADDRESS; }
@ -190,6 +185,40 @@ private:
static const MemberList AddressMemberList;
};
/**
* Integer constants either literals or computed. Example expressions: 2, 2+10, ~10.
* There is one distinct type per value.
*/
class IntegerConstantType: public Type
{
public:
virtual Category getCategory() const override { return Category::INTEGER_CONSTANT; }
static std::shared_ptr<IntegerConstantType const> fromLiteral(std::string const& _literal);
explicit IntegerConstantType(bigint _value): m_value(_value) {}
virtual bool isImplicitlyConvertibleTo(Type const& _convertTo) const override;
virtual bool isExplicitlyConvertibleTo(Type const& _convertTo) const override;
virtual TypePointer unaryOperatorResult(Token::Value _operator) const override;
virtual TypePointer binaryOperatorResult(Token::Value _operator, TypePointer const& _other) const override;
virtual bool operator==(Type const& _other) const override;
virtual bool canBeStored() const override { return false; }
virtual bool canLiveOutsideStorage() const override { return false; }
virtual unsigned getSizeOnStack() const override { return 1; }
virtual std::string toString() const override;
virtual u256 literalValue(Literal const* _literal) const override;
/// @returns the smallest integer type that can hold the value or an empty pointer if not possible.
std::shared_ptr<IntegerType const> getIntegerType() const;
private:
bigint m_value;
};
/**
* String type with fixed length, up to 32 bytes.
*/
@ -211,7 +240,7 @@ public:
virtual bool isValueType() const override { return true; }
virtual std::string toString() const override { return "string" + dev::toString(m_bytes); }
virtual u256 literalValue(Literal const& _literal) const override;
virtual u256 literalValue(Literal const* _literal) const override;
int getNumBytes() const { return m_bytes; }
@ -238,7 +267,7 @@ public:
virtual bool isValueType() const override { return true; }
virtual std::string toString() const override { return "bool"; }
virtual u256 literalValue(Literal const& _literal) const override;
virtual u256 literalValue(Literal const* _literal) const override;
};
/**