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https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandJon Meow
a4aff26821
This enables us to manage local variables in Carbon using C++ RAII. Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
81 lines
2.1 KiB
C++
81 lines
2.1 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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#include "executable_semantics/interpreter/action.h"
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#include <iterator>
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#include <map>
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#include <optional>
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#include <utility>
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#include <vector>
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#include "executable_semantics/ast/declaration.h"
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#include "executable_semantics/ast/expression.h"
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#include "executable_semantics/common/arena.h"
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#include "executable_semantics/interpreter/stack.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/Casting.h"
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namespace Carbon {
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using llvm::cast;
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Scope::Scope(Scope&& other) noexcept
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: values_(other.values_),
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locals_(std::exchange(other.locals_, {})),
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heap_(other.heap_) {}
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auto Scope::operator=(Scope&& rhs) noexcept -> Scope& {
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values_ = rhs.values_;
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locals_ = std::exchange(rhs.locals_, {});
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heap_ = rhs.heap_;
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return *this;
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}
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Scope::~Scope() {
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for (const auto& l : locals_) {
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std::optional<AllocationId> a = values_.Get(l);
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CHECK(a.has_value());
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heap_->Deallocate(*a);
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}
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}
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void Action::Print(llvm::raw_ostream& out) const {
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switch (kind()) {
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case Action::Kind::LValAction:
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out << cast<LValAction>(*this).expression();
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break;
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case Action::Kind::ExpressionAction:
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out << cast<ExpressionAction>(*this).expression();
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break;
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case Action::Kind::PatternAction:
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out << cast<PatternAction>(*this).pattern();
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break;
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case Action::Kind::StatementAction:
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cast<StatementAction>(*this).statement().PrintDepth(1, out);
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break;
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case Action::Kind::ScopeAction:
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out << "ScopeAction";
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}
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out << "<" << pos_ << ">";
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if (results_.size() > 0) {
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out << "(";
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llvm::ListSeparator sep;
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for (auto& result : results_) {
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out << sep << *result;
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}
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out << ")";
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}
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}
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void Action::PrintList(const Stack<Nonnull<Action*>>& ls,
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llvm::raw_ostream& out) {
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llvm::ListSeparator sep(" :: ");
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for (const auto& action : ls) {
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out << sep << *action;
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}
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}
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} // namespace Carbon
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