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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/expression.h
+6
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@@ -19,6 +19,7 @@ enum class ExpressionKind {
GetField,
Index,
IntT,
ContinuationT, // The type of a continuation value.
Integer,
PatternVariable,
PrimitiveOp,
@@ -100,6 +101,8 @@ auto MakeGetField(int line_num, Expression* exp, std::string field)
auto MakeTuple(int line_num,
std::vector<std::pair<std::string, Expression*>>* args)
-> Expression*;
// Create an AST node for an empty tuple.
auto MakeUnit(int line_num) -> Expression*;
auto MakeIndex(int line_num, Expression* exp, Expression* i) -> Expression*;
auto MakeTypeType(int line_num) -> Expression*;
@@ -108,6 +111,9 @@ auto MakeBoolType(int line_num) -> Expression*;
auto MakeFunType(int line_num, Expression* param, Expression* ret)
-> Expression*;
auto MakeAutoType(int line_num) -> Expression*;
// Returns a Continuation type AST node at the given source location,
// which is the type of a continuation value.
auto MakeContinuationType(int line_num) -> Expression*;
void PrintExp(const Expression* exp);