- [x] Rationalize the load failure code path.
- [x] Remove support for reload to be aborted via a callback.
- [x] If a reload fails due to an unwind error, ignore it as the isolate is dead anyway.
- [x] Move more allocations into the zone.
Review URL: https://codereview.chromium.org/2208553002 .
- [x] Use a single outer zone for all zone allocations done during a reload. This fixes an issue where we were allocating objects in different zones that were destroyed before we expected them to be.
- [x] Rename some methods.
- [x] Made most methods on IsolateReloadContext private.
R=rmacnak@google.com
Review URL: https://codereview.chromium.org/2201093002 .
We now check all of the scripts which make up a library. If any
script is modified, then we consider that library to be modified. We
also consider any library which imports a modified library to be
modified. To propagate this info efficiently, we build and discard
the imported-by graph when beginning a reload.
The embedder must provide a FileModifiedCallback in order to support
the detection of modified scripts.
In order to detect changes to package: libraries, we have modified the
embedder interface to provide the resolved url when possible, so that
we don't need to re-resolve package uris when checking for reload.
This change is incompatible and all embedders will need to be updated.
We now support a "force" flag when reloading sources. This causes all
libraries to be reloaded regardless of whether the underlying scripts
have been updated.
Closes#26919R=johnmccutchan@google.com
Review URL: https://codereview.chromium.org/2186423002 .
Delete the reload context after the last use. My first attempt did not work
with our unit test framework for reload cc tests. When running unit tests
the reload context is needed for longer, and deleted separately.
BUG=#26895
R=johnmccutchan@google.com
Review URL: https://codereview.chromium.org/2164703003 .
- [x] Bump maximum number of vm arguments (fixes a bunch of reload crashes....)
- [x] Only check that an isolate has reload if it was ever runnable.
- [x] Skip some isolate tests that use deferred libraries or are checking for closure identity.
R=rmacnak@google.com
Review URL: https://codereview.chromium.org/2141763002 .
- [x] Start reloading even earlier.
- [x] Keep the value of FLAG_reload_every per-isolate (so spawned isolates reload eagerly too).
- [x] Adjust the reload every back off curve to be linear in the beginning.
- [x] Cap the reload every threshold at 1,000,000
- [x] Test status file updates.
- [x] Stop disabling the background compiler / OSR when running tests.
- [x] Skip multi tests with compilation errors when reloading.
BUG=
R=rmacnak@google.com
Review URL: https://codereview.chromium.org/2133823002 .
- [x] Add --hot-reload-test-mode to standalone embedder.
- [x] Have test.py pass `--hot-reload-test-mode` instead of specific flags.
- [x] Add --reload_every_back_off flag to control exponential backof off reloads.
- [x] Add --check_reloaded flag to ensure that an isolate has reloaded at least once before exiting.
BUG=
R=rmacnak@google.com
Review URL: https://codereview.chromium.org/2118923002 .
Lookup and updates to the megamorphic cache tables should be protected by a
separate mutex - using isolate->mutex() can cause a dead lock if the background
compiler holds this lock while it's being stopped by the mutator thread.
BUG=#26808
R=asiva@google.com
Review URL: https://codereview.chromium.org/2118813003 .
- [x] Report the reload error synchronously from the _reloadSources RPC.
- [x] Add sticky reload error to an isolate so we can report the error.
- [x] Remove redundant 'OnStackReload'.
- [x] Fix a bug where a class could have a field added but we wouldn't reject it.
- [x] Add unit test for above bug fix.
- [x] Enable reload via the service protocol with a live stack.
R=fschneider@google.com
Review URL: https://codereview.chromium.org/2070873002 .
This cl implements an experimental filesystem maintained in the vm, called dart-devfs. This will allow service protocol users to read and write source files while the vm is running. This is needed for the reload support for flutter.
R=turnidge@google.com
Review URL: https://codereview.chromium.org/2059883003 .
Rework how we check guarded state consistency in background compiler.
Background compiler was storing original fields inside guarded fields list. This caused a race during inlining when inliner would copy guarded fields one by one from the callee function into the caller, because ParsedFunction::AddToGuardedFields looks at the guarded_cid to filter out those fields that should not be guarded.
As a result if some guarded field transitioned to unguarded (kDynamicCid) after callee graph construction but before list of guarded fields were copied then AddToGuardedFields would simply skip that field because it now has guarded_cid() == kDynamicCid.
We fix this race by always placing copies into the list of guarded fields and unwrapping them only in FinalizeCode.
Placing the copies also allows us to simplify a lot of code that was trying to verify guarded state consistency before committing the generated optimized code - now that we store copies in the list we can just compare their state to the originals and abort if the state is different.
Additionally fix deduplication check that was comparing original fields with copies - resulting in adding the same field into the list multiple times.
Add an assertion that verifies that we are not trying to access guarded_cid of original field from background compiler.
R=fschneider@google.com
BUG=
Review URL: https://codereview.chromium.org/2006793002 .
This is a cut of the work that Todd and I collaborated on in the reload branch.
In this CL, we've dropped the loader port hacks, in other words, on stack reloading in the standalone embedder does not work yet.
- [x] Support for hot reloading of isolate source code
- [x] Unit test harness and many tests
- [x] Service protocol and Observatory support
- [x] Product build does not include support for hot reloading.
R=rmacnak@google.com
Review URL: https://codereview.chromium.org/1965823002 .
- Ensure the uniqueness of private keys without having to
search the existing key space.
- Pass a thread parameter where useful to library methods.
BUG=
Review URL: https://codereview.chromium.org/1947393003 .
This undoes most of b2f3e8efe1.
This optimization prevents precompiled code from being disabled and re-enabled, because disabling causes the code to lose its only reference to its own instructions. This was okay for precompilated code that ran without a JIT because it is never disabled, but precompiled code that runs in a JIT will become disabled when corresponding optimized code is compiled and re-abled after a deopt.
R=fschneider@google.com
Review URL: https://codereview.chromium.org/1925153003 .
Ryan Macnak