From 32994caee8e2d06dad9006c8a6e0931e03818403 Mon Sep 17 00:00:00 2001
From: Michajlo Matijkiw <michajlo@google.com>
Date: Mon, 1 Aug 2016 15:43:25 +0000
Subject: Don't fill in stack trace for ReturnException

This is used to implement return, it's not really an exceptional condition
requiring a full trace.

--
MOS_MIGRATED_REVID=128988641
---
 .../devtools/build/lib/syntax/EvalException.java    | 21 +++++++++++++++++++--
 .../devtools/build/lib/syntax/ReturnStatement.java  |  6 +++---
 2 files changed, 22 insertions(+), 5 deletions(-)

(limited to 'src/main')

diff --git a/src/main/java/com/google/devtools/build/lib/syntax/EvalException.java b/src/main/java/com/google/devtools/build/lib/syntax/EvalException.java
index 2f7ca84564..97d695f91d 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/EvalException.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/EvalException.java
@@ -19,9 +19,7 @@ import com.google.common.base.Throwables;
 import com.google.devtools.build.lib.events.Location;
 import com.google.devtools.build.lib.util.LoggingUtil;
 import com.google.devtools.build.lib.util.Preconditions;
-
 import java.util.logging.Level;
-
 import javax.annotation.Nullable;
 
 /**
@@ -59,6 +57,25 @@ public class EvalException extends Exception {
    * @param dueToIncompleteAST if the error is caused by a previous error, such as parsing.
    */
   public EvalException(Location location, String message, boolean dueToIncompleteAST) {
+    this(location, message, dueToIncompleteAST, true);
+  }
+
+  /**
+   * Create an EvalException with the option to not fill in the java stack trace. An optimization
+   * for ReturnException, and potentially others, which aren't exceptional enough to include a
+   * stack trace.
+   *
+   * @param location the location where evaluation/execution failed.
+   * @param message the error message.
+   * @param dueToIncompleteAST if the error is caused by a previous error, such as parsing.
+   * @param fillInJavaStackTrace whether or not to fill in the java stack trace for this exception
+   */
+  EvalException(
+      Location location,
+      String message,
+      boolean dueToIncompleteAST,
+      boolean fillInJavaStackTrace) {
+    super(null, null, /*enableSuppression=*/ true, fillInJavaStackTrace);
     this.location = location;
     this.message = Preconditions.checkNotNull(message);
     this.dueToIncompleteAST = dueToIncompleteAST;
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/ReturnStatement.java b/src/main/java/com/google/devtools/build/lib/syntax/ReturnStatement.java
index fa1aac406f..d3dac8198c 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/ReturnStatement.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/ReturnStatement.java
@@ -18,7 +18,6 @@ import com.google.devtools.build.lib.events.Location;
 import com.google.devtools.build.lib.syntax.compiler.DebugInfo;
 import com.google.devtools.build.lib.syntax.compiler.LoopLabels;
 import com.google.devtools.build.lib.syntax.compiler.VariableScope;
-
 import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
 import net.bytebuddy.implementation.bytecode.member.MethodReturn;
 
@@ -30,11 +29,12 @@ public class ReturnStatement extends Statement {
   /**
    * Exception sent by the return statement, to be caught by the function body.
    */
-  public class ReturnException extends EvalException {
+  public static class ReturnException extends EvalException {
     Object value;
 
     public ReturnException(Location location, Object value) {
-      super(location, "Return statements must be inside a function");
+      super(location, "Return statements must be inside a function",
+          /*dueToIncompleteAST=*/ false, /*fillInJavaStackTrace=*/ false);
       this.value = value;
     }
 
-- 
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