m::ast::ErrorExpr Struct Reference

The error expression. More...

#include <AST.hpp>

Inheritance diagram for m::ast::ErrorExpr:

Collaboration diagram for m::ast::ErrorExpr:

Public Member Functions
	ErrorExpr (Token tok)
bool	is_constant () const override
	Returns true iff this Expr is constant, i.e.
bool	can_be_null () const override
	Returns true iff this Expr is nullable, i.e.
bool	contains_free_variables () const override
	Returns true iff this Expr contains a free variable.
bool	contains_bound_variables () const override
	Returns true iff this Expr contains a bound variable.
uint64_t	hash () const override
	Computes a hash of this, considering only syntactic properties.
bool	operator== (const Expr &other) const override
	Returns true iff other is syntactically equal to this.
void	accept (ASTExprVisitor &v) override
void	accept (ConstASTExprVisitor &v) const override
const Type *	type () const
	Returns the Type of this Expr.
void	type (const Type *type)
	Sets the Type of this Expr.
bool	has_type () const
	Returns true iff this Expr has been assigned a Type, most likely by Sema.
bool	operator!= (const Expr &other) const
	Returns false iff other is syntactically equal to this.
Schema	get_required () const
	Returns a Schema instance containing all required definitions.
void	dot (std::ostream &out) const
	Writes a Graphivz dot representation of this Expr to out.
M_LCOV_EXCL_STOP void	dump (std::ostream &out) const
void	dump () const

Data Fields
Token	tok
	the token of the expression; serves as an anchor to locate the expression in the source

Private Attributes
const Type *	type_ = nullptr
	‍the type of an expression, determined by the semantic analysis
bool	is_correlated_ = false
	Whether this Expr is correlated within its query, i.e.

Detailed Description

The error expression.

Used when the parser encountered a syntactical error.

Definition at line 115 of file AST.hpp.

Constructor & Destructor Documentation

ErrorExpr()

m::ast::ErrorExpr::ErrorExpr ( Token  tok )

inlineexplicit

Definition at line 117 of file AST.hpp.

Member Function Documentation

accept() [1/2]

void m::ast::ErrorExpr::accept ( ASTExprVisitor &  v )

overridevirtual

Implements m::ast::Expr.

accept() [2/2]

void m::ast::ErrorExpr::accept ( ConstASTExprVisitor &  v ) const

overridevirtual

Implements m::ast::Expr.

can_be_null()

bool m::ast::ErrorExpr::can_be_null ( ) const

inlineoverridevirtual

Returns true iff this Expr is nullable, i.e.

may evaluate to NULL at runtime.

Implements m::ast::Expr.

Definition at line 120 of file AST.hpp.

contains_bound_variables()

bool m::ast::ErrorExpr::contains_bound_variables ( ) const

inlineoverridevirtual

Returns true iff this Expr contains a bound variable.

A bound variable is a Designator that is bound to an Attribute or another Expr within the query.

Implements m::ast::Expr.

Definition at line 122 of file AST.hpp.

contains_free_variables()

bool m::ast::ErrorExpr::contains_free_variables ( ) const

inlineoverridevirtual

Returns true iff this Expr contains a free variable.

A free variable is a Designator that is not bound to an Attribute or another Expr within the query but defined by an outer, enclosing statement.

Implements m::ast::Expr.

Definition at line 121 of file AST.hpp.

dot()

void Expr::dot ( std::ostream &  out ) const

inherited

Writes a Graphivz dot representation of this Expr to out.

Used to render ASTs with Graphivz.

Definition at line 205 of file AST.cpp.

References m::ast::Expr::dot().

Referenced by m::ast::Expr::dot().

dump() [1/2]

void Expr::dump ( ) const

inherited

Definition at line 235 of file AST.cpp.

References m::ast::Expr::dump().

Referenced by m::ast::Expr::dump().

dump() [2/2]

M_LCOV_EXCL_START void Expr::dump ( std::ostream &  out ) const

inherited

Definition at line 229 of file AST.cpp.

get_required()

Schema Expr::get_required ( ) const

inherited

Returns a Schema instance containing all required definitions.

Recursively traverses the Expr to find all Designators. Note, that FnApplicationExprs require special handling: a FnApplicationExpr that is an aggregation is stringified to a Schema::Identifier and not processed further recursively. The reason for this special treatment is that aggregations are performed during grouping and the aggregate value is referenced by the stringified expression (or alias, if given).

Definition at line 145 of file AST.cpp.

References m::Schema::add(), m::Catalog::Get(), m::Schema::has(), id, m::Catalog::pool(), and m::visit().

has_type()

bool m::ast::Expr::has_type ( ) const

inlineinherited

Returns true iff this Expr has been assigned a Type, most likely by Sema.

Definition at line 63 of file AST.hpp.

hash()

uint64_t m::ast::ErrorExpr::hash ( ) const

inlineoverridevirtual

Computes a hash of this, considering only syntactic properties.

Other properties are ignored, e.g. type or designator target.

Implements m::ast::Expr.

Definition at line 124 of file AST.hpp.

is_constant()

bool m::ast::ErrorExpr::is_constant ( ) const

inlineoverridevirtual

Returns true iff this Expr is constant, i.e.

consists only of constants and can be evaluated at compilation time.

Implements m::ast::Expr.

Definition at line 119 of file AST.hpp.

operator!=()

bool m::ast::Expr::operator!= ( const Expr &  other ) const

inlineinherited

Returns false iff other is syntactically equal to this.

Definition at line 85 of file AST.hpp.

operator==()

bool ErrorExpr::operator== ( const Expr &  other ) const

overridevirtual

Returns true iff other is syntactically equal to this.

Implements m::ast::Expr.

Definition at line 87 of file AST.cpp.

type() [1/2]

const Type * m::ast::Expr::type ( ) const

inlineinherited

Returns the Type of this Expr.

Assumes that the Expr has been assigned a Type by the Sema.

Definition at line 58 of file AST.hpp.

References M_notnull.

Referenced by m::ast::Sema::create_designator(), m::ast::UnaryExpr::hash(), m::ast::BinaryExpr::hash(), index_scan_codegen_compilation(), m::wasm::ExprCompiler::operator()(), and WeighExpr::operator()().

type() [2/2]

void m::ast::Expr::type ( const Type *  type )

inlineinherited

Sets the Type of this Expr.

Should be used when constructing an Expr outside of the Sema. Should not be called to replace an already assigned type.

Definition at line 61 of file AST.hpp.

References M_insist, and m::ast::Expr::type().

Referenced by m::ast::Expr::type().

Field Documentation

is_correlated_

bool m::ast::Expr::is_correlated_ = false

privateinherited

Whether this Expr is correlated within its query, i.e.

whether this Expr contains free variables that are bound by an outside query.

Definition at line 50 of file AST.hpp.

tok

Token m::ast::Expr::tok

inherited

the token of the expression; serves as an anchor to locate the expression in the source

Definition at line 43 of file AST.hpp.

Referenced by m::ast::Sema::create_designator(), m::ast::Constant::hash(), m::Interpreter::M_OPERATOR_LIST(), and m::ast::Constant::operator==().

type_

const Type* m::ast::Expr::type_ = nullptr

privateinherited

‍the type of an expression, determined by the semantic analysis

Definition at line 47 of file AST.hpp.

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The documentation for this struct was generated from the following files:

• include/mutable/parse/AST.hpp
• src/parse/AST.cpp