From 365e47882a65b9dc040bc466aa6463b87e4c87b2 Mon Sep 17 00:00:00 2001
From: Alexey Andreev <konsoletyper@gmail.com>
Date: Mon, 27 Aug 2018 22:08:03 +0300
Subject: [PATCH] Avoid generation of too deeply nested expressions to fit into
 v8 parser stack

---
 .../java/org/teavm/ast/optimization/OptimizingVisitor.java    | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core/src/main/java/org/teavm/ast/optimization/OptimizingVisitor.java b/core/src/main/java/org/teavm/ast/optimization/OptimizingVisitor.java
index 70fae9542..280617112 100644
--- a/core/src/main/java/org/teavm/ast/optimization/OptimizingVisitor.java
+++ b/core/src/main/java/org/teavm/ast/optimization/OptimizingVisitor.java
@@ -64,6 +64,7 @@ import org.teavm.ast.WhileStatement;
 import org.teavm.model.TextLocation;
 
 class OptimizingVisitor implements StatementVisitor, ExprVisitor {
+    private static final int MAX_DEPTH = 20;
     private Expr resultExpr;
     Statement resultStmt;
     private final boolean[] preservedVars;
@@ -286,6 +287,9 @@ class OptimizingVisitor implements StatementVisitor, ExprVisitor {
                 return;
             }
 
+            if (locationStack.size() > MAX_DEPTH) {
+                return;
+            }
             if (readFrequencies[index] != 1 || preservedVars[index]) {
                 return;
             }