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Dave Abrahams
dd4e37e761
Making Values const allows us to separate the actual mutations (search for "*&" in this change) from places where the Value is effectively passed by-value.
51 lines
1.5 KiB
C++
51 lines
1.5 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_ACTION_H_
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#define EXECUTABLE_SEMANTICS_INTERPRETER_ACTION_H_
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#include <iostream>
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#include <vector>
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#include "executable_semantics/ast/expression.h"
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#include "executable_semantics/ast/statement.h"
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#include "executable_semantics/interpreter/stack.h"
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#include "executable_semantics/interpreter/value.h"
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namespace Carbon {
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enum class ActionKind {
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LValAction,
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ExpressionAction,
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StatementAction,
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ValAction,
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ExpToLValAction,
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DeleteTmpAction
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};
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struct Action {
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ActionKind tag;
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union {
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Expression* exp; // for LValAction and ExpressionAction
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Statement* stmt;
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const Value* val; // for finished actions with a value (ValAction)
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Address delete_tmp;
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} u;
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int pos; // position or state of the action
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std::vector<const Value*> results; // results from subexpression
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};
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void PrintAct(Action* act, std::ostream& out);
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void PrintActList(Stack<Action*> ls, std::ostream& out);
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auto MakeExpAct(Expression* e) -> Action*;
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auto MakeLvalAct(Expression* e) -> Action*;
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auto MakeStmtAct(Statement* s) -> Action*;
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auto MakeValAct(const Value* v) -> Action*;
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auto MakeExpToLvalAct() -> Action*;
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auto MakeDeleteAct(Address a) -> Action*;
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_INTERPRETER_ACTION_H_
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