From 02e8955abcf3eba7dedf133b4036082c48307b90 Mon Sep 17 00:00:00 2001
From: Alexey Andreev <alexey.andreev@delightex.com>
Date: Wed, 17 Mar 2021 10:16:07 +0300
Subject: [PATCH] JS: fix overflow behaviour of unary minus

---
 .../javascript/rendering/StatementRenderer.java      | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/core/src/main/java/org/teavm/backend/javascript/rendering/StatementRenderer.java b/core/src/main/java/org/teavm/backend/javascript/rendering/StatementRenderer.java
index 5ba1684ee..9e9ba4c42 100644
--- a/core/src/main/java/org/teavm/backend/javascript/rendering/StatementRenderer.java
+++ b/core/src/main/java/org/teavm/backend/javascript/rendering/StatementRenderer.java
@@ -836,6 +836,18 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
                         precedence = Precedence.min();
                         expr.getOperand().acceptVisitor(this);
                         writer.append(')');
+                    } else if (expr.getType() == OperationType.INT) {
+                        if (outerPrecedence.ordinal() > Precedence.BITWISE_OR.ordinal()) {
+                            writer.append('(');
+                        }
+                        writer.append(" -");
+                        precedence = Precedence.UNARY;
+                        expr.getOperand().acceptVisitor(this);
+                        writer.ws().append("|").ws();
+                        writer.append("0");
+                        if (outerPrecedence.ordinal() > Precedence.BITWISE_OR.ordinal()) {
+                            writer.append(')');
+                        }
                     } else {
                         if (outerPrecedence.ordinal() > Precedence.UNARY.ordinal()) {
                             writer.append('(');