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https://github.com/carbon-language/carbon-lang.git
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Jon Meow
acb33932cb
Note this makes some structural choices that I'm not sure how popular they'll be... Most notably, I could remove `DeclarationKind` because I'm using `std::visit` and `Declaration::Visitor` in reality. I could go to `switch(tag())` instead, but I'm wondering if this approach will be well received for the separation of ownership. Alternatively, I could move `Declaration` around so that it actually implements the things like `TopLevel` -- I did feel weird with the old structure of typecheck.cpp implementing members of declaration.h, though.
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
// 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_DECLARATION_H_
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#define EXECUTABLE_SEMANTICS_AST_DECLARATION_H_
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#include <list>
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#include <string>
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#include "executable_semantics/ast/function_definition.h"
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#include "executable_semantics/ast/member.h"
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#include "executable_semantics/ast/struct_definition.h"
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#include "executable_semantics/interpreter/address.h"
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#include "executable_semantics/interpreter/dictionary.h"
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namespace Carbon {
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struct Value;
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using TypeEnv = Dictionary<std::string, const Value*>;
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using Env = Dictionary<std::string, Address>;
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struct TypeCheckContext {
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// Symbol table mapping names of runtime entities to their type.
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TypeEnv types;
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// Symbol table mapping names of compile time entities to their value.
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Env values;
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};
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enum class DeclarationKind {
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FunctionDeclaration,
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StructDeclaration,
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ChoiceDeclaration,
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VariableDeclaration,
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};
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struct FunctionDeclaration {
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static constexpr DeclarationKind Kind = DeclarationKind::FunctionDeclaration;
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FunctionDefinition definition;
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};
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struct StructDeclaration {
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static constexpr DeclarationKind Kind = DeclarationKind::StructDeclaration;
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StructDefinition definition;
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};
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struct ChoiceDeclaration {
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static constexpr DeclarationKind Kind = DeclarationKind::ChoiceDeclaration;
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int line_num;
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std::string name;
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std::list<std::pair<std::string, const Expression*>> alternatives;
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};
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// Global variable definition implements the Declaration concept.
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struct VariableDeclaration {
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static constexpr DeclarationKind Kind = DeclarationKind::VariableDeclaration;
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int source_location;
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std::string name;
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const Expression* type;
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const Expression* initializer;
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};
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class Declaration {
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public:
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static auto MakeFunctionDeclaration(FunctionDefinition definition)
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-> const Declaration;
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static auto MakeStructDeclaration(int line_num, std::string name,
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std::list<Member*> members)
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-> const Declaration;
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static auto MakeChoiceDeclaration(
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int line_num, std::string name,
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std::list<std::pair<std::string, const Expression*>> alternatives)
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-> const Declaration;
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static auto MakeVariableDeclaration(int source_location, std::string name,
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const Expression* type,
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const Expression* initializer)
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-> const Declaration;
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auto GetFunctionDeclaration() const -> const FunctionDeclaration&;
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auto GetStructDeclaration() const -> const StructDeclaration&;
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auto GetChoiceDeclaration() const -> const ChoiceDeclaration&;
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auto GetVariableDeclaration() const -> const VariableDeclaration&;
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void Print() const;
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inline auto tag() const -> DeclarationKind {
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return std::visit([](const auto& t) { return t.Kind; }, value);
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}
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private:
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std::variant<FunctionDeclaration, StructDeclaration, ChoiceDeclaration,
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VariableDeclaration>
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value;
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};
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_AST_DECLARATION_H_
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