eclipse-xtext / eclipse-xtext/xtext
Method call argument evaluation order incorrect
Open
Nobody has claimed this yet.
bug
confirmed
- Dominant language
- Java
- Stars
- 831
- Forks
- 330
- Avg merge
- 3d 7h
- Merged PRs (30d)
- 12
Description
Arguments don't evaluate from left to right in some scenarios.
Example:
class Order {
static val array = newIntArrayOfSize(1)
static var index = 0
def static void main(String[] args) {
array.set(index, index++)
}
}
Compiles to:
@SuppressWarnings("all")
public class Order {
private final static int[] array = new int[1];
private static int index = 0;
public static void main(final String[] args) {
int _plusPlus = Order.index++;
Order.array[Order.index] = _plusPlus;
}
}
As a result, behaves incorrectly:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
at Order.main(Order.java:11)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue from the Order example and compare the generated Java with the intended left-to-right argument evaluation. The issue does not name source files or tests; done means the generated code evaluates arguments left to right and the example no longer throws ArrayIndexOutOfBoundsException.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100