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Geoff RomerandJon Meow
d5124256a2
- Move Heap and Frame/Scope to their own headers. - Move some functions to more appropriate headers (e.g. CopyValue -> value.h). - Define a separate Bazel rule for each header/cpp pair. - Modify PrintValue to not print the frames of a ContinuationValue. This was necessary to break a dependency cycle between PrintValue, PrintFrame, and Action::Print. Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
55 lines
1.9 KiB
C++
55 lines
1.9 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 "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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namespace Carbon {
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using Env = Dictionary<std::string, Address>;
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struct Scope {
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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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// 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<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<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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Frame(std::string n, Stack<Scope*> s, Stack<Action*> c)
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: name(std::move(std::move(n))), scopes(s), todo(c), continuation() {}
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};
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void PrintFrame(Frame* frame, std::ostream& out);
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_INTERPRETER_FRAME_H_
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