Split the ConstAndJvmFieldPropertiesLowering into two: ConstLowering
which replaces const vals with their values, and
PropertiesToFieldsLowering which removes unnecessary property accessors
(such as for JvmField or private properties with default accessors) and
replaces calls to those accessors with field access
Initializers are "set field" expressions and are considered redundant
when they are:
1. In the primary constructor; and
2. Set the field to `0`, `false`, or `null`; and
3. Have a `null` origin. I.e., not in an initializer block or
constructor body, and therefore the field could not have been set by a
prior expression.
Simplify ifs when branches have condition true/false.
Simplify blocks containing only a variable declaration
and a variable get of the same variable. Simplify to
just the condition.
Do not introduce temporary variables for constants for
null checks. Constants have no side-effects and can be
reloaded freely instead of going through a local.
This simplifies code such as "42.toLong()!!" so that the
resulting code has no branches and uses no locals. The
simplifications happen as follows:
```
block
temp = 42.toLong()
when
(temp == null) throw NPE
(true) load temp
---> null test simplification
block
temp = 42.toLong()
when
(false) throw NPE
(true) load temp
---> when simplification
block
temp = 42.toLong()
load temp
---> block simplification
42.toLong()
```
Introduce lowering to remove null checks for primitive type
expressions and replace them with true/false. Side-effects
are preserved.
Generate ifnull/ifnonnull instructions for null checks instead
of materializing a null literal for an equality check.
Introduce lowering phase that turns !!exp -> exp for the boolean
'not' builtin. This makes sure that code such as
```
if (!!!!!booleanValue) {
doStuff()
}
```
generates only one branch.
All bytecode text tests are run with stdlib in the classpath and only
for JVM backend, therefore directives WITH_RUNTIME, TARGET_BACKEND,
IGNORE_BACKEND are not needed
Use `// !LANGUAGE: -ReleaseCoroutines` instead in tests which require
old (1.2) coroutines, and nothing in tests which require new coroutines
because master is already 1.3. Also remove superfluous API_VERSION and
other directives which have no effect anymore. Do not include runtime
automatically with `WITH_COROUTINES`/`COMMON_COROUTINES_TEST` in box
tests; require `WITH_RUNTIME` for that (majority of tests already had it
anyway), but remove it from bytecode text tests where runtime is always
added automatically. Fix the coroutine package selection code in
KotlinTestUtils and update the bunch files correspondingly.
Disable tests in `box/coroutines/noStdLib` on JVM: despite the name,
these tests were launched with stdlib because of the code in
CodegenTestCase, and they do not work without it because at least
CoroutineUtil.kt requires stdlib to compile correctly
Most of these tests used this directive as a way to opt in to a new
language feature, and most of those features are already stable for a
long time, so no opt-in is needed. Some other tests used the directive
to opt out from a language feature, replace those by the `LANGUAGE`
directive. One test used the directive to test behavior that actually
depended on the API version; use `API_VERSION` directive there instead.
See `ExpressionCodegen.genEqualsForExpressionsPreferIeee754Arithmetic`:
the behavior here actually depends on the API version, not any language
feature
Previously, for a property named `x` in the companion object of a class
named `Foo`, we generated:
- `Foo.access$getX$cp`, consisting of `GETFIELD Foo.x` and lateinit
assertion
- `Foo.Companion.getX`, consisting of `INVOKEVIRTUAL Foo.access$getX$cp`
Now, we generate:
- `Foo.access$getX$cp`, consisting of `GETFIELD Foo.x`
- `Foo.Companion.getX`, consisting of `INVOKEVIRTUAL Foo.access$getX$cp`
and lateinit assertion
The reason is that this way we can avoid generating another accessor and
reuse `Foo.access$getX$cp` in case `isInitialized` is called on a
lateinit property from companion.
For private properties, getX is not generated, but instead the assertion
is generated on each access to the field (which can be improved, see
KT-28331). The same happens for access to non-private properties from
inside the same context where they're declared.
#KT-21862 In Progress
Sometimes, state-machine, generated in inline functions with
crossinline parameter, is transformed, since all usages should be
renamed.
However, this is wrong: in this case, we will have state-machine
inside state-machine.
This fix addresses the issue.
#KT-25893 Fixed
* The members of Result are isSuccess, isFailure, exceptionOrNull, getOrNull
* The rest of API is implemented via inline-only extensions
* There are two internal functions to hide detailed mechanics of an internal
Result.Failure class: createFailure and throwOnFailure
* Result.toString is explicit: either Success(v) or Failure(x)
See KT-26538
<IMPL_SUFFIX> for method is a method signature hash,
if method value parameter types contain inline class types,
otherwise 'impl'.
Constructor methods are named as 'constructor-<IMPL_SUFFIX>'.
Synthesized 'box' and 'unbox' methods are named as
'<METHOD_NAME>-<IMPL_SUFFIX>'.
Erased implementations of overriding and non-overriding methods
are named as '<METHOD_NAME>-<IMPL_SUFFIX>'.
Fully specialized implementation of 'equals' will have a special suffix.
