[GROOVY-8149] Bad Compiler Performance in case of syntax errors when using many subscript operators

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.3.7, 2.5.0-alpha-1, 2.4.10, 3.0.4
• Component/s: Compiler
• Environment: Windows 7
• Assignee: Unassigned
• Reporter: Ivo Colombo
• Created: 07/Apr/17 13:00
• Updated: 27/Jun/20 08:22

Description

See the following script with a Syntax error (unbalanced parentheses), which repeatedly uses the subscript operator to set something on an object which has the putAt method defined:

class A {
	void putAt(key, value) {
		// whatever
	}
}

def a = new A()

a[1] = (
a[2] = 2
a[3] = 3
a[4] = 4
a[5] = 5
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0
a[1] = 0

Expected: The compiler returns with a syntax error.

Observed: The script takes very long (in the order of minutes) to compile. If it is shortened (remove some of the assignments), at some point it compiles within reasonable time (< 1 Minute), but still slow. The syntax error is reported correctly.