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https://github.com/carbon-language/carbon-lang.git
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Jon Meow
47325be112
This also eliminates the ctad wrapper for Stack: I think the leaning is to remove it. It felt worth keeping the constructor because constructing with a single element is a common use-case. Adds a single-argument constructor for Scope because the `std::list<std::string>()` is common, and eliding it is consistent with what we've done for things like tuples. I was considering a vector constructor due to the double-Push on line 1139, but thought the Push() semantics may mean that it's better not to provide.
63 lines
2.2 KiB
C++
63 lines
2.2 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_INTERPRETER_FRAME_H_
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#define EXECUTABLE_SEMANTICS_INTERPRETER_FRAME_H_
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#include <list>
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#include <string>
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#include "common/ostream.h"
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#include "executable_semantics/interpreter/action.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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#include "executable_semantics/interpreter/stack.h"
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#include "llvm/Support/Compiler.h"
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namespace Carbon {
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using Env = Dictionary<std::string, Address>;
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struct Scope {
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explicit Scope(Env values) : Scope(values, std::list<std::string>()) {}
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Scope(Env values, std::list<std::string> l)
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: values(values), locals(std::move(l)) {}
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Env values;
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std::list<std::string> locals;
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};
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// A frame represents either a function call or a delimited continuation.
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struct Frame {
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Frame(const Frame&) = delete;
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Frame& operator=(const Frame&) = delete;
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Frame(std::string n, Stack<Ptr<Scope>> s, Stack<Ptr<Action>> c)
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: name(std::move(std::move(n))), scopes(s), todo(c), continuation() {}
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void Print(llvm::raw_ostream& out) const;
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LLVM_DUMP_METHOD void Dump() const { Print(llvm::errs()); }
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// The name of the function.
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std::string name;
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// If the frame represents a function call, the bottom scope
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// contains the parameter-argument bindings for this function
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// call. The rest of the scopes contain local variables defined by
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// blocks within the function. The scope at the top of the stack is
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// the current scope and its environment is the one used for looking
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// up the value associated with a variable.
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Stack<Ptr<Scope>> scopes;
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// The actions that need to be executed in the future of the
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// current function call. The top of the stack is the action
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// that is executed first.
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Stack<Ptr<Action>> todo;
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// If this frame is the bottom frame of a continuation, then it stores
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// the address of the continuation.
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std::optional<Address> continuation;
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};
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_INTERPRETER_FRAME_H_
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