class Crystal::InstanceVarsInitializerVisitor

Overview

In this pass we check instance var initializers like:

@x = 1
@x : Int32 = 1

These initializers run when an instance is created, so there's no way that the main code can use them before creating an instance to use them. Conclusion: we must analyze them before the main code.

This solves the following problem:

# Here the compiler would complain because @bar
# wasn't initialized/analyzed yet
Foo.new.bar + 1

class Foo
  @bar = 1

  def bar
    @bar
  end
end

Defined in:

compiler/crystal/semantic/instance_vars_initializer_visitor.cr

Instance Method Summary

Instance methods inherited from class Crystal::SemanticVisitor

check_allowed_in_lib(node, type = node.type.instance_type) check_allowed_in_lib, check_class_var_annotations check_class_var_annotations, check_declare_var_type(node, declared_type, variable_kind) check_declare_var_type, check_outside_exp(node, op) check_outside_exp, class_var_owner(node) class_var_owner, current_type : ModuleType current_type, current_type=(current_type : ModuleType) current_type=, end_visit_any(node) end_visit_any, eval_macro(node, &) eval_macro, expand_inline_macro(node, mode = nil, accept = true) expand_inline_macro, expand_macro(node, raise_on_missing_const = true, first_pass = false, accept = true)
expand_macro(the_macro, node, mode = nil, *, visibility : Visibility, accept = true, &) expand_macro, expand_macro_argument(node, expansion_scope) expand_macro_argument, expand_macro_arguments(call, expansion_scope) expand_macro_arguments, free_vars : Hash(String, TypeVar) | Nil free_vars, inside_exp? inside_exp?, interpret_enum_value(node : ASTNode, target_type : IntegerType | Nil = nil) interpret_enum_value, lookup_annotation(ann) lookup_annotation, lookup_type(node : ASTNode, free_vars = nil, find_root_generic_type_parameters = true) lookup_type, nesting_exp?(node) nesting_exp?, process_annotations(annotations, &) process_annotations, program : Program program, pushing_type(type : ModuleType, &) pushing_type, read_annotations read_annotations, scope : Type scope, scope=(scope : Type)
scope=(scope : Crystal::Type | Nil) scope=, scope? : Type | Nil scope?, validate_annotation(annotation_type, ann) validate_annotation, vars : MetaVars vars, vars=(vars : MetaVars) vars=, visit(node : Require)
visit(node : ClassDef)
visit(node : ModuleDef)
visit(node : AnnotationDef)
visit(node : EnumDef)
visit(node : LibDef)
visit(node : Include)
visit(node : Extend)
visit(node : Alias)
visit(node : Def)
visit(node : Macro)
visit(node : Annotation)
visit(node : Call)
visit(node : MacroExpression)
visit(node : MacroIf)
visit(node : MacroFor)
visit(node : MacroVerbatim)
visit(node : ExternalVar | Path | Generic | ProcNotation | Union | Metaclass | Self | TypeOf)
visit(node : ASTNode) visit, visit_any(node) visit_any

Constructor methods inherited from class Crystal::SemanticVisitor

new(program : Crystal::Program, vars : Hash(String, Crystal::MetaVar) = MetaVars.new) new

Instance methods inherited from class Crystal::Visitor

accept(node) accept, end_visit(node) end_visit, end_visit_any(node) end_visit_any, visit_any(node) visit_any

Instance methods inherited from class Reference

==(other : self)
==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup, hash(hasher) hash, initialize initialize, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference) : Bool
same?(other : Nil) same?, to_s(io : IO) : Nil to_s

Constructor methods inherited from class Reference

new new, unsafe_construct(address : Pointer, *args, **opts) : self unsafe_construct

Class methods inherited from class Reference

pre_initialize(address : Pointer) pre_initialize

Instance methods inherited from class Object

! : Bool !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, as(type : Class) as, as?(type : Class) as?, class class, dup dup, hash(hasher)
hash hash, in?(collection : Object) : Bool
in?(*values : Object) : Bool in?, inspect(io : IO) : Nil
inspect : String inspect, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, not_nil!(message)
not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, responds_to?(name : Symbol) : Bool responds_to?, tap(&) tap, to_json(io : IO) : Nil
to_json : String to_json, to_pretty_json(indent : String = " ") : String
to_pretty_json(io : IO, indent : String = " ") : Nil to_pretty_json, to_s(io : IO) : Nil
to_s : String to_s, to_yaml(io : IO) : Nil
to_yaml : String to_yaml, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

Class methods inherited from class Object

from_json(string_or_io : String | IO, root : String)
from_json(string_or_io : String | IO) from_json, from_yaml(string_or_io : String | IO) from_yaml

Macros inherited from class Object

class_getter(*names, &block) class_getter, class_getter!(*names) class_getter!, class_getter?(*names, &block) class_getter?, class_property(*names, &block) class_property, class_property!(*names) class_property!, class_property?(*names, &block) class_property?, class_setter(*names) class_setter, def_clone def_clone, def_equals(*fields) def_equals, def_equals_and_hash(*fields) def_equals_and_hash, def_hash(*fields) def_hash, delegate(*methods, to object) delegate, forward_missing_to(delegate) forward_missing_to, getter(*names, &block) getter, getter!(*names) getter!, getter?(*names, &block) getter?, property(*names, &block) property, property!(*names) property!, property?(*names, &block) property?, setter(*names) setter

Instance Method Detail

def finish #

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def initializers : Array(Crystal::InstanceVarsInitializerVisitor::Initializer) #

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def type_instance_var(node, target, value) #

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def visit(node : Assign) #

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def visit(node : TypeDeclaration) #

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def visit_any(node) #

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