Previously, the following code would throw an IllegalMonitorStateException:
public class Test {
public static synchronized void main(String[] args) {
Test.class.notify();
}
}
The problem stems from the fact that for a long time Avian has had two
representations of a given class: avian.VMClass and java.lang.Class.
It used to be that there was only one, java.lang.Class, but that
didn't play nicely with OpenJDK's class library, so we split it into
two. Unfortunately, we forgot to update the JIT and interpreter
accordingly, so a static synchronized method would acquire the
avian.VMClass instance, whereas Foo.class.notify() would be invoked on
the java.lang.Class instance.
This commit fixes it.
These expressions are tricky because they rely on invokedynamic, which
normally implies runtime code generation. However, since lambdas
don't actually use the "dynamicness" of invokedynamic, we can convert
them into static calls to synthetic classes at compile time.
Since I had already written code to synthesize such classes in Java
and I didn't want to rewrite it in C++, I needed to add support for
running Java code to the bootimage generator. And since the primary
VM used by the generator is purpose-built to generate AOT-compiled
code for a specific target architecture and is not capable of
generating or running JIT-compiled code for the host architecture, I
added support for loading a second, independent, host-specific VM for
running Java code.
The rest of the patch handles the fact that each method compilation
might cause new, synthetic classes to be created, so we need to make
sure those classes and their methods are included in the final heap
and code images. This required breaking some giant code blocks out of
makeCodeImage into their own methods, which makes the diff look
scarier than it really is.
This addresses a recent regression where different versions of
MinGW(-w64) had different opinions about whether to use e.g. %I64d or
%lld to print 64-bit integers on 32-bit platforms.
There's no need to enter IdleState (and incur synchronization
overhead) unless another thread is waiting to enter ExclusiveState.
This change improves the performance of the MemoryRamp test by a
factor of about 100.
Previously, I used a shell script to extract modification date ranges
from the Git history, but that was complicated and unreliable, so now
every file just gets the same year range in its copyright header. If
someone needs to know when a specific file was modified and by whom,
they can look at the Git history themselves; no need to include it
redundantly in the header.
Previously, we would attempt to initialize a class (e.g. call its
static initializer) whenever a method in that class was called, as
well as in any of the cases listed in
http://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.4.
However, the above approach may lead to deadlock in an app which
relies on being able to call non-static methods in parallel with a
static initializer invocation in the same class. Thus, this commit
ensures that we initialize classes only in the cases defined by the
standard.
This is necessary to avoid name conflicts on various platforms. For
example, iOS has its own util.h, and Windows has a process.h. By
including our version as e.g. "avian/util.h", we avoid confusion with
the system version.
Previously, if you forgot to use RUNTIME_ARRAY_BODY to reference an
array declared with (THREAD_)RUNTIME_ARRAY, you wouldn't get a
compiler error until you tried to build on e.g. MSVC, where
runtime-sized stack arrays aren't supported. This change ensures you
find out regardless of what compiler you're using, which ought to
protect us from regressions going forward.
