DCEVM
This project is a fork of original DCEVM project.
The purpose of the project is to maintain enhanced class redefinition functionality for OpenJDK HotSpot 7/8.
Binaries
You can download binaries here.
Supported versions
pathes/ contains patches for all supported versions. Each patch is named by concatenating prefix full
or light
with the OpenJDK HotSpot tag. full
patches support full redefenition capabilities (including removal of superclasses, for example). light
patches are easier to maintain, but they only support limited functionality (generally, additions to class hierarchies are fine, removals are not).
HotSpot tag is the name of the tag in the corresponding HotSpot Mercurial repository (Java 8/Java 7).
Building
General Requirements
You need the following software to build DCEVM:
- Java 7 or later. If you intend to run tests, it should be one of the supported versions (see list of patches/)
- C++ compiler toolchain (gcc). There is no strict version requirement except that it should be supported by HotSpot build scripts.
- Mercurial
Compiling DCEVM
- Configure version you want in gradle.properties.
- Run
./gradlew patch
to retrieve HotSpot sources and patch them. - Run
./gradlew compileFastdebug
to buildfastdebug
version or./gradlew compileProduct
to buildproduct
version. - Compiled libraries are placed in
hotspot/build/fastdebug
orhotspot/build/product
.
Installing DCEVM
- Replace
libjvm.so/jvm.dll/libjvm.dylib
in the target JRE. - Run
java -version
, it should includeDynamic Code Evolution
string.
Or you can install DCEVM using the gradle script:
- Run
./gradlew installFastdebug -PtargetJre=$JAVA_HOME/jre
or./gradlew installProduct -PtargetJre=$JAVA_HOME/jre
- DCEVM will be installed as "alternative" JVM. To use it, add
-XXaltjvm=dcevm
Testing DCEVM
- Configure version you want in gradle.properties.
- Set
JAVA_HOME
to point to JDK you want to test against (should be compatible with the version you set in gradle.properties). - Run
./gradlew patch
to retrieve HotSpot sources and patch them. - Run
./gradlew test
to run tests. - Tests reports will be in
dcevm/build/reports/tests/index.html
To run tests from IDE, you need:
- Run
./gradlew agent:build
to build redefinition agent code. - Add JVM argument to use redefinition agent (
-javaagent:agent/build/libs/agent.jar
). - Add JVM argument to DCEVM VM if installed side-by-side (
-XXaltjvm=dcevm
).