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Experimental control-flow operator (#368)

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* 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>
This commit is contained in:
Jeremy G. Siek
2021-03-26 11:22:48 -04:00
committed by GitHub
co-authored by Dave Abrahams Geoff Romer
parent 6df0d51516
commit 3fa72d2984
35 changed files with 674 additions and 31 deletions
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executable_semantics/ast/statement.h
+29 -1
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@@ -22,7 +22,10 @@ enum class StatementKind {
While,
Break,
Continue,
Match
Match,
Continuation, // Create a first-class continuation.
Run, // Run a continuation to the next await or until it finishes..
Await, // Pause execution of the continuation.
};
struct Statement {
@@ -69,6 +72,15 @@ struct Statement {
std::list<std::pair<Expression*, Statement*>>* clauses;
} match_stmt;
struct {
std::string* continuation_variable;
Statement* body;
} continuation;
struct {
Expression* argument;
} run;
} u;
};
@@ -86,6 +98,22 @@ auto MakeContinue(int line_num) -> Statement*;
auto MakeMatch(int line_num, Expression* exp,
std::list<std::pair<Expression*, Statement*>>* clauses)
-> Statement*;
// Returns an AST node for a continuation statement give its line number and
// contituent parts.
//
// __continuation <continuation_variable> {
// <body>
// }
auto MakeContinuationStatement(int line_num, std::string continuation_variable,
Statement* body) -> Statement*;
// Returns an AST node for a run statement give its line number and argument.
//
// __run <argument>;
auto MakeRun(int line_num, Expression* argument) -> Statement*;
// Returns an AST node for an await statement give its line number.
//
// __await;
auto MakeAwait(int line_num) -> Statement*;
void PrintStatement(Statement*, int);