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test-protect-nested.cpp
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77 lines (68 loc) · 2.49 KB
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#include "cpp11/function.hpp"
#include "cpp11/protect.hpp"
#include "testthat.h"
/*
* See https://github.com/r-lib/cpp11/pull/327 for full details.
*
* - `cpp11::package("cpp11test")["test_destruction_outer"]` uses
* `unwind_protect()` to call R level `test_destruction_outer()` but no entry
* macros are set up. Instead we are going to catch exceptions that get here
* with `expect_error_as()`.
*
* - Call R level `test_destruction_outer()` to set up `BEGIN_CPP11` /
* `END_CPP11` entry macros.
*
<
6880
/div> * - C++ `test_destruction_outer()` goes through `unwind_protect()` to call
* the R level `test_destruction_inner()`.
*
* - R level `test_destruction_inner()` sets up its own `BEGIN_CPP11` /
* `END_CPP11` entry macros.
*
* - C++ `test_destruction_inner()` goes through `unwind_protect()` to call
* `Rf_error()` (i.e., we are nested within `unwind_protect()`s!).
*
* - `longjmp()` is caught from inner `unwind_protect()`, and an exception
* is thrown which is caught by the inner entry macros, allowing us to run
* the destructor of `x`, then we let R continue the unwind process.
*
* - This `longjmp()`s again and is caught by the outer `unwind_protect()`, an
* exception is thrown which is caught by the outer entry macros, and we let
* R continue the unwind process one more time.
*
* - This `longjmp()` is caught by `cpp11::package()`'s `unwind_protect()`,
* an exception is thrown, and that is caught by `expect_error_as()`.
*/
// Global variable to detect if the destructor has been run or not
static bool destructed = false;
class HasDestructor {
public:
~HasDestructor();
};
HasDestructor::~HasDestructor() {
// Destructor has run!
destructed = true;
}
[[cpp11::register]] void test_destruction_inner() {
// Expect that `x`'s destructor gets to run on the way out
HasDestructor x{};
cpp11::stop("oh no!");
}
[[cpp11::register]] void test_destruction_outer() {
const auto test_destruction_inner =
cpp11::package("cpp11test")["test_destruction_inner"];
test_destruction_inner();
}
context("unwind_protect-nested-C++") {
test_that(
"nested `unwind_protect()` (with entry macros set up) will run destructors"
"(#327)") {
const auto fn = [&] {
const auto test_destruction_outer =
cpp11::package("cpp11test")["test_destruction_outer"];
test_destruction_outer();
};
expect_error_as(fn(), cpp11::unwind_exception);
expect_true(destructed);
destructed = false;
}
}