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interfaces, impls, and constrained generics (basics) (#1073)
* interfaces, impls, and constrained generics (basics) * separate type checking into declare vs. type check, removing redundancy * external impls * added impl scopes to handle generics calling generics * cleanup * more cleanup * Update executable_semantics/testdata/interface/external_impl_point_vector.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Update executable_semantics/testdata/interface/generic_call_generic.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Update executable_semantics/testdata/interface/tuple_vector_add_scale.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Update executable_semantics/testdata/interface/vector_point_add_scale.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * change ImplementationDeclaration to ImplDeclaration * remove impl_type_value * split NamedEntity into two * changed GetName to be a free function * adding comments * more edits to respond to review * introduce ImplBinding, remove punning on GenericBinding * new test case and some minor edits * refactor GetMember and GetField to move impl logic to interpreter * remove commennt * change EntityView to ImplBinding in FieldAccess... * move ImplBinding * review response * added example to impl_scope.h * minor edits * Update executable_semantics/interpreter/field_path.h Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/interpreter/value.cpp Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/interpreter/interpreter.cpp Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/ast/expression.h Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/ast/expression.h Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/ast/generic_binding.h Co-authored-by: Geoff Romer <gromer@google.com> * more edits from review * review response * Update executable_semantics/ast/static_scope.h Co-authored-by: Geoff Romer <gromer@google.com> * remove ImplType, renamed node_view to value_node Co-authored-by: josh11b <josh11b@users.noreply.github.com> Co-authored-by: Geoff Romer <gromer@google.com>
This commit is contained in:
Jeremy G. Siek
committed by
GitHub
GitHub
co-authored by
josh11b
Geoff Romer
josh11b
Geoff Romer
parent
8f6e42d866
commit
7cce1bd124
@@ -0,0 +1,139 @@
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef EXECUTABLE_SEMANTICS_AST_GENERIC_BINDING_H_
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#define EXECUTABLE_SEMANTICS_AST_GENERIC_BINDING_H_
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#include <map>
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#include "common/check.h"
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#include "common/ostream.h"
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#include "executable_semantics/ast/ast_node.h"
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#include "executable_semantics/ast/value_category.h"
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namespace Carbon {
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class Value;
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class Expression;
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class ImplBinding;
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// TODO: expand the kinds of things that can be deduced parameters.
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// For now, only generic parameters are supported.
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class GenericBinding : public AstNode {
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public:
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using ImplementsCarbonValueNode = void;
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GenericBinding(SourceLocation source_loc, std::string name,
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Nonnull<Expression*> type)
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: AstNode(AstNodeKind::GenericBinding, source_loc),
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name_(std::move(name)),
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type_(type) {}
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void Print(llvm::raw_ostream& out) const override;
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static auto classof(const AstNode* node) -> bool {
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return InheritsFromGenericBinding(node->kind());
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}
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auto name() const -> const std::string& { return name_; }
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auto type() const -> const Expression& { return *type_; }
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auto type() -> Expression& { return *type_; }
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// The static type of the binding. Cannot be called before typechecking.
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auto static_type() const -> const Value& { return **static_type_; }
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// Sets the static type of the binding. Can only be called once, during
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// typechecking.
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void set_static_type(Nonnull<const Value*> type) {
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CHECK(!static_type_.has_value());
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static_type_ = type;
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}
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auto value_category() const -> ValueCategory { return ValueCategory::Let; }
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auto constant_value() const -> std::optional<Nonnull<const Value*>> {
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return constant_value_;
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}
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// Sets the value returned by constant_value(). Can only be called once,
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// during typechecking.
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void set_constant_value(Nonnull<const Value*> value) {
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CHECK(!constant_value_.has_value());
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constant_value_ = value;
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}
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// The impl binding associated with this type variable.
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auto impl_binding() const -> std::optional<Nonnull<const ImplBinding*>> {
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return impl_binding_;
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}
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// Set the impl binding.
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void set_impl_binding(Nonnull<const ImplBinding*> binding) {
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CHECK(!impl_binding_.has_value());
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impl_binding_ = binding;
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}
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private:
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std::string name_;
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Nonnull<Expression*> type_;
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std::optional<Nonnull<const Value*>> static_type_;
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std::optional<Nonnull<const Value*>> constant_value_;
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std::optional<Nonnull<const ImplBinding*>> impl_binding_;
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};
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using BindingMap =
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std::map<Nonnull<const GenericBinding*>, Nonnull<const Value*>>;
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// The run-time counterpart of a `GenericBinding`.
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//
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// Once a generic binding has been declared, it can be used
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// in two different ways: as a compile-time constant with a
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// symbolic value (such as a `VariableType`), or as a run-time
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// variable with a concrete value that is stored on the stack.
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// An `ImplBinding` is used in contexts where the second
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// interpretation is intended.
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class ImplBinding : public AstNode {
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public:
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using ImplementsCarbonValueNode = void;
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ImplBinding(SourceLocation source_loc,
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Nonnull<const GenericBinding*> type_var,
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Nonnull<const Value*> iface)
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: AstNode(AstNodeKind::ImplBinding, source_loc),
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type_var_(type_var),
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iface_(iface) {}
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static auto classof(const AstNode* node) -> bool {
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return InheritsFromImplBinding(node->kind());
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}
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void Print(llvm::raw_ostream& out) const override;
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// The binding for the type variable.
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auto type_var() const -> Nonnull<const GenericBinding*> { return type_var_; }
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// The interface being implemented.
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auto interface() const -> Nonnull<const Value*> { return iface_; }
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// Required for the the ValueNode interface
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auto constant_value() const -> std::optional<Nonnull<const Value*>> {
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return std::nullopt;
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}
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// The static type of the impl. Cannot be called before typechecking.
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auto static_type() const -> const Value& { return **static_type_; }
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// Sets the static type of the impl. Can only be called once, during
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// typechecking.
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void set_static_type(Nonnull<const Value*> type) {
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CHECK(!static_type_.has_value());
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static_type_ = type;
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}
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auto value_category() const -> ValueCategory { return ValueCategory::Let; }
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private:
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Nonnull<const GenericBinding*> type_var_;
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Nonnull<const Value*> iface_;
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std::optional<Nonnull<const Value*>> static_type_;
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};
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_AST_GENERIC_BINDING_H_
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