Set a lower limit for max variables

Bug: 433646300
Change-Id: Icbcf88d431a255a3f6df6ca113e6c784e5b96e2c
Reviewed-on: https://chrome-internal-review.googlesource.com/c/v8/fuzzilli/+/8446876
Reviewed-by: Carl Smith <[email protected]>
Reviewed-by: Michael Achenbach <[email protected]>
Commit-Queue: Matthias Liedtke <[email protected]>

Author: Liedtke

Sources/Fuzzilli/Base/ProgramBuilder.swift

@@ -4000,7 +4000,13 @@ public class ProgramBuilder {
 
     /// Returns the next free variable.
     func nextVariable() -> Variable {
-        assert(numVariables < Code.maxNumberOfVariables, "Too many variables")
+        // Temporarily introduce a lower limit: Programs shouldn't get exceedingly large.
+        // TODO(mliedtke): Undo this once the issues are fixed.
+        let maxNumberOfVariables = 10_000
+        assert(maxNumberOfVariables <= Code.maxNumberOfVariables)
+        if numVariables >= maxNumberOfVariables {
+            fatalError("Too many variables \(numVariables). Contributors: \(contributors.map {$0.name})")
+        }
         numVariables += 1
         return Variable(number: numVariables - 1)
     }