I found it, the tricky part was there are so many repos just listed there on their git repo page (http://git.eclipse.org/c/), you kind of have to inspect each page, it is listed under the category "platform", as opposed to all the plugin ID's being listed in alphabetic order:
For org.eclipse.debug.core (where IProcess is), it is here:
http://git.eclipse.org/c/platform/eclipse.platform.debug.git/tree/org.eclipse.debug.core
Answer from Zombies on Stack OverflowI found it, the tricky part was there are so many repos just listed there on their git repo page (http://git.eclipse.org/c/), you kind of have to inspect each page, it is listed under the category "platform", as opposed to all the plugin ID's being listed in alphabetic order:
For org.eclipse.debug.core (where IProcess is), it is here:
http://git.eclipse.org/c/platform/eclipse.platform.debug.git/tree/org.eclipse.debug.core
Depending on your needs, The Eclipse Common Build Infrastructure (CBI) might help.
The CBI project has converted Eclipse into a Tycho project which means you can get all the sources and compile them into a working Eclipse build with 2-3 commands.
I found it, the tricky part was there are so many repos just listed there on their git repo page (http://git.eclipse.org/c/), you kind of have to inspect each page, it is listed under the category "platform", as opposed to all the plugin ID's being listed in alphabetic order:
For org.eclipse.debug.core (where IProcess is), it is here:
http://git.eclipse.org/c/platform/eclipse.platform.debug.git/tree/org.eclipse.debug.core
Answer from Zombies on Stack OverflowVideos
When you are coding in Eclipse, press CTRL and click on any core Java class name in your source. Eclipse will now show a screen saying you don't have the sources installed. However, in this screen there is a link saying "Attach source...". Click that link and import the src.zip file from your JDK installation directory (src.zip). This should do the trick
You need to have the JDK installed. Then you can look in JDK_INSTALL_DIR\src.zip
For me it is C:\Program Files\java\jdk1.6.0_11\ (depends on your current version)
You don't need to get a special open source version.
The Eclipse SDK ships with Source bundles. These bundles contain the source code used for that version, but you can't really build them to get the IDE. These are shipped so that developers can see / use the source while they're developing their own application.
Depending on what you're trying to do in your research project, these bundles might be enough. For example, if you want to do some analysis techniques or code metrics, you can probably just use these. You can download old SDKs from the archive server.
If this is not enough, and you need to re-create the exact source code that was used for each release, you'll need to clone the Git repositories and checkout the tag associated with Each release. This is going to be complicated since there are about 22 different source repos for the IDE alone. Here is a link to the list of repos.
Download appropriate "Eclipse SDK" packages - they are Eclipse Platform + Java Tools + Plug-in Tools with complete sources.