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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>
123 lines
2.9 KiB
C++
123 lines
2.9 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_AST_EXPRESSION_H_
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#define EXECUTABLE_SEMANTICS_AST_EXPRESSION_H_
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#include <string>
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#include <vector>
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namespace Carbon {
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enum class ExpressionKind {
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AutoT,
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BoolT,
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Boolean,
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Call,
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FunctionT,
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GetField,
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Index,
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IntT,
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ContinuationT, // The type of a continuation value.
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Integer,
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PatternVariable,
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PrimitiveOp,
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Tuple,
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TypeT,
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Variable,
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};
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enum class Operator {
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Add,
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And,
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Eq,
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Neg,
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Not,
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Or,
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Sub,
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};
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struct Expression {
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int line_num;
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ExpressionKind tag;
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union {
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struct {
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std::string* name;
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} variable;
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struct {
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Expression* aggregate;
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std::string* field;
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} get_field;
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struct {
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Expression* aggregate;
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Expression* offset;
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} index;
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struct {
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std::string* name;
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Expression* type;
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} pattern_variable;
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int integer;
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bool boolean;
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struct {
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std::vector<std::pair<std::string, Expression*>>* fields;
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} tuple;
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struct {
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Operator op;
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std::vector<Expression*>* arguments;
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} primitive_op;
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struct {
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Expression* function;
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Expression* argument;
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} call;
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struct {
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Expression* parameter;
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Expression* return_type;
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} function_type;
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} u;
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};
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auto MakeVar(int line_num, std::string var) -> Expression*;
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auto MakeVarPat(int line_num, std::string var, Expression* type) -> Expression*;
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auto MakeInt(int line_num, int i) -> Expression*;
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auto MakeBool(int line_num, bool b) -> Expression*;
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auto MakeOp(int line_num, Operator op, std::vector<Expression*>* args)
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-> Expression*;
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auto MakeUnOp(int line_num, enum Operator op, Expression* arg) -> Expression*;
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auto MakeBinOp(int line_num, enum Operator op, Expression* arg1,
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Expression* arg2) -> Expression*;
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auto MakeCall(int line_num, Expression* fun, Expression* arg) -> Expression*;
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auto MakeGetField(int line_num, Expression* exp, std::string field)
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-> Expression*;
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auto MakeTuple(int line_num,
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std::vector<std::pair<std::string, Expression*>>* args)
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-> Expression*;
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// Create an AST node for an empty tuple.
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auto MakeUnit(int line_num) -> Expression*;
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auto MakeIndex(int line_num, Expression* exp, Expression* i) -> Expression*;
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auto MakeTypeType(int line_num) -> Expression*;
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auto MakeIntType(int line_num) -> Expression*;
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auto MakeBoolType(int line_num) -> Expression*;
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auto MakeFunType(int line_num, Expression* param, Expression* ret)
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-> Expression*;
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auto MakeAutoType(int line_num) -> Expression*;
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// Returns a Continuation type AST node at the given source location,
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// which is the type of a continuation value.
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auto MakeContinuationType(int line_num) -> Expression*;
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void PrintExp(const Expression* exp);
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_AST_EXPRESSION_H_
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