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Develop a Java based JVM compiler interface (JVMCI) enabling a compiler written in Java to be used by the JVM as a dynamic compiler.
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Goals
- Allow a Java component programmed against the JVMCI to be loaded at runtime and used by the JVM’s compile broker.
- Allow a Java component programmed against the JVMCI to be loaded at runtime and used by trusted Java codeto install machine code in the JVM that can be called via a Java reference to the installed code.
Non-Goals
- Integration of a dynamic compiler (such as Graal) based on JVMCI.
Success Metrics
- The ability of a JVMCI based dynamic compiler to run on the unmodified JVM. The performance of compiler andits generated code are not of high concern since JVMCI will be an experimental feature in JDK 9 and as suchonly enabled by specifying certain flags on the command line.
Motivation
An optimizing compiler is a complex piece of software that benefits greatly from the features provided by Javasuch as automatic memory management, exception handling, synchronization, excellent (and free) IDEs, excellentunit testing support and runtime extensibility via service loaders just to name a few. In addition,a compiler does not require the low-level language features required by many other JVM subsystems such as thebytecode interpreter and garbage collector. These observations strongly suggest that writing a JVM compiler inJava should allow production of a high quality compiler that will be easier to maintain and improve than existingcompilers developed in C or C++. JVMCI provides the API necessary to demonstrate and experiment with this potential.
Description
The JVMCI API will be composed of mechanisms for:
- Accessing VM data structures required by an optimizing bytecode-to-machine-code compilersuch as classes, fields, methods, profiling information etc.
- Installing compiled code along with all the metadata required by the JVM for managingcompiled code such as GC maps and information to support deoptimization.
- Plugging into the JVM's compilation system to handle servicing JVM requests to produce machine code for methods.
An excellent demonstration of using JVMCI to write and deploy a high performance compiler in the JVM isprovided by Graal which has demonstrated peak performance on par with C2 across a wide range of benchmarks.
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Alternatives
There are no existing alternatives for a Java based compiler that is usable as a dynamic compiler in the JVM.
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Testing
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The JVMCI implementation includes an extensive set of unit tests for the parts of the API exposed to a compilerdeveloper as well as white box tests for internal parts that makes calls into the VM to implement the public parts.
Risks and Assumptions
A Java API that allows VM internals to be accessed and compiled code to be installed and executed presents anobvious security risk. In JDK8 (where JVMCI was first prototyped and is still co-developed along with the JDK 9port), the JVMCI API was hidden from untrusted code by loading it with a class loader inaccessible to anythingbut code on the boot class path. In JDK 9, the intention is to use access controls that are part ofthe Module System JEP 261 to prevent untrusted code from being able to use JVMCI. JVMCI needs to be as securedas the Unsafe class is.
JVMCI will be experimental in JDK 9 and such will require extra command line options to enable it. For example:
Making JVMCI experimental allows for extensive experimentation while mitigating any risk to JVM customers.
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Dependencies
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As mentioned above, JVMCI is dependent on the access controls in JEP 261 to isolate JVMCI from untrusted code.