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3fa72d2984
* AST and syntax for delimited control * stashing for later * a little more progress * progress on delimited continuations * delimit, suspend, and resume implemented (draft) * example that generates the natural numbers * fixes * tinkering * changed demo to experimental * comments and name changes * describe delimited continuations in the README * renamed Snapshot to Continuation, edits to comments * Update executable_semantics/ast/statement.h improve comment for MakeDelimitStmt Co-authored-by: Dave Abrahams <dabrahams@google.com> * Update executable_semantics/interpreter/interpreter.cpp remove snake_case Co-authored-by: Dave Abrahams <dabrahams@google.com> * edits to comments, change name of variable * updates to handle review edits * trailing whitespace * fixes to delimited continuations, added more tests, also fixed assignment to do a copy * improvements from Geoffrey * new test from Geoffrey, fix for empty blocks * more suggestions from Geoffrey * more tests for delimited continuations, renaming some of them * renamed test files * improve a comment * sketch of creating continuation * initial implementation of shift/reset style continuations * more documentation * fix some camel case * implemented deep copy of continuations, added a test case for it * fixed a bug and got the recursive test case working * removed __delimit, polished up __continuation * back to shallow copy for continuations * suggestions from Geoffrey * removed structured binding (for now) * Update executable_semantics/ast/expression.cpp Co-authored-by: Geoff Romer <gromer@google.com> * responses to Geoffrey Co-authored-by: Dave Abrahams <dabrahams@google.com> Co-authored-by: Geoff Romer <gromer@google.com>
84 lines
2.7 KiB
C++
84 lines
2.7 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_INTERPRETER_H_
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#define EXECUTABLE_SEMANTICS_INTERPRETER_INTERPRETER_H_
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#include <list>
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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/interpreter/action.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 "executable_semantics/interpreter/value.h"
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namespace Carbon {
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using Env = Dictionary<std::string, Address>;
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/***** Scopes *****/
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struct Scope {
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Scope(Env e, std::list<std::string> l) : env(e), locals(std::move(l)) {}
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Env env;
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std::list<std::string> locals;
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};
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/***** Frames and State *****/
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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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// Otherwise the `continuation` field is the sentinel UINT_MAX.
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Address continuation;
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// Returns whether this frame is the bottom frame of a continuation.
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auto IsContinuation() -> bool { return continuation != UINT_MAX; }
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Frame(std::string n, Stack<Scope*> s, Stack<Action*> c)
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: name(std::move(std::move(n))),
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scopes(s),
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todo(c),
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continuation(UINT_MAX) {}
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};
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struct State {
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Stack<Frame*> stack;
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std::vector<const Value*> heap;
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std::vector<bool> alive;
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};
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extern State* state;
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auto PrintFrame(Frame* frame, std::ostream& out) -> void;
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void PrintStack(Stack<Frame*> ls, std::ostream& out);
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void PrintEnv(Env env);
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auto AllocateValue(const Value* v) -> Address;
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auto CopyVal(const Value* val, int line_num) -> const Value*;
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auto ToInteger(const Value* v) -> int;
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/***** Interpreters *****/
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auto InterpProgram(std::list<Declaration>* fs) -> int;
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auto InterpExp(Env env, Expression* e) -> const Value*;
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_INTERPRETER_INTERPRETER_H_
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