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LibJS: Add TemporaryClearException helper class

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This is very similar to AK::TemporaryChange (and in fact replaces one
use of it), but since we can't directly set VM's m_exception from
outside of the VM, we need something more sophisticated.
Sometimes we need to temporarily remove the stored exception for some
other operation to succeed (e.g. anything that uses call(), as well as
get_without_side_effects()) and later restore it - the boilerplate code
required for this is annoying enough to justify a helper.
This commit is contained in:
Linus Groh 2021-04-24 17:56:16 +02:00 • committed by Andreas Kling
parent 3a4d42bbbb
commit 5caab0148c
2 changed files with 36 additions and 2 deletions
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4
Userland/Libraries/LibJS/Runtime/VM.cpp
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@ -8,7 +8,6 @@
#include <AK/Debug.h>
#include <AK/ScopeGuard.h>
#include <AK/StringBuilder.h>
#include <AK/TemporaryChange.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
@ -18,6 +17,7 @@
#include <LibJS/Runtime/Reference.h>
#include <LibJS/Runtime/ScriptFunction.h>
#include <LibJS/Runtime/Symbol.h>
#include <LibJS/Runtime/TemporaryClearException.h>
#include <LibJS/Runtime/VM.h>
namespace JS {
@ -376,7 +376,7 @@ void VM::run_queued_promise_jobs()
dbgln_if(PROMISE_DEBUG, "Running queued promise jobs");
// Temporarily get rid of the exception, if any - job functions must be called
// either way, and that can't happen if we already have an exception stored.
TemporaryChange change(m_exception, static_cast<Exception*>(nullptr));
TemporaryClearException clear_exception(*this);
while (!m_promise_jobs.is_empty()) {
auto* job = m_promise_jobs.take_first();
dbgln_if(PROMISE_DEBUG, "Calling promise job function @ {}", job);