single builder parameter
single postponed type variable
single origin of type information
relevant issues:
KT-60719
KT-60720
KT-60855
KT-60877
KT-60880
If used toolchain JavaVersion is not yet supported by the current Kotlin
compiler, we are now fallback to the highest supported JVM target
version instead of failing the build.
^KT-58987 Fixed
Currently, when generating a TypeInfo with a vtable attached, the K/N
compiler generates two globals to the resulting LLVM module:
- "ktypeglobal:$fqName#internal" -- an internal global of the aggregate
type (TypeInfo+vtable)
- "kclass:$fqName" -- an internal or hidden alias pointing to the
TypeInfo part of that global
The reason for emitting two globals is to have everything strict-typed,
since other LLVM modules might import the kclass as a TypeInfo.
Importing an aggregate TypeInfo+vtable global as a TypeInfo global works
too, of course. It is just a little bit less clean.
The new Xcode 15 linker now emits symbols for the ktypeglobal to the
symbol table, including an STSYM. This happens for classes compiled to
cache, when the kclass is hidden, not internal.
The problem is: for some reason, such an STSYM for
"ktypeglobal:kotlin.String#internal" makes lldb find a wrong address
(0xffffffffffffffff) for "kclass:kotlin.String", despite those being
two different symbol names. This seems to be related to them having
the same address though.
The K/N lldb script, konan_lldb.py, uses "kclass:kotlin.String" to
determine if an object is a string, in order to display it properly.
Therefore, using the new Xcode 15 linker when compiling with caches
makes the debugger unable to display string variables properly. As a
side effect, this also breaks displaying array-typed variables (because
the script first checks if an object is a string).
This commit fixes this by removing ktypeglobals completely, making the
compiler emit only a kclass as an aggregate global directly.
Now, there are other ways to fix the problem. For example, making the
ktypeglobal private instead of internal, or making konan_lldb.py use a
runtime function instead of querying "kclass:kotlin.String" directly.
But it seems that LLVM aliases are not common on darwin platforms. For
example, Clang doesn't support `__attribute__((alias(...)))` on these
platforms.
So it is safer to just stop using aliases here.
^KT-61417
Lists have defined contracts for equals and hashCode and thus might be used as map keys for the sake of caching. Gradle's file collections do not follow those contracts, leading to cache misses and creating too many classloaders.
#KT-61426 Fixed
In partial module compilation, especially inside the IDE, only a few
files from the project are passed to fir2ir. FIR in these files might
contain references to declarations from other files.
As the FE doesn't usually care about called property initializers,
called properties might be resolved to 'CONTRACTS' or even 'STATUS'.
The backend, however, might need to inline constant expressions from
properties.
Dmitriy Novozhilov