1 files changed, 58 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/DebugFrame.java b/src/main/java/com/google/devtools/build/lib/syntax/DebugFrame.java
new file mode 100644
index 0000000000..362739ca93
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/syntax/DebugFrame.java
@@ -0,0 +1,58 @@
+// Copyright 2018 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.devtools.build.lib.syntax;
+
+import com.google.auto.value.AutoValue;
+import com.google.common.collect.ImmutableMap;
+import com.google.devtools.build.lib.events.Location;
+import javax.annotation.Nullable;
+
+/** The information about a single frame in a thread's stack trace relevant to the debugger. */
+@AutoValue
+public abstract class DebugFrame {
+  /** The source location where the frame is currently paused. */
+  @Nullable
+  public abstract Location location();
+
+  /** The name of the function that this frame represents. */
+  public abstract String functionName();
+
+  /**
+   * The local bindings associated with the current lexical frame. For the outer-most scope this
+   * will be empty.
+   */
+  public abstract ImmutableMap<String, Object> lexicalFrameBindings();
+
+  /** The global vars and builtins for this frame. May be shadowed by the lexical frame bindings. */
+  public abstract ImmutableMap<String, Object> globalBindings();
+
+  public static Builder builder() {
+    return new AutoValue_DebugFrame.Builder().setLexicalFrameBindings(ImmutableMap.of());
+  }
+
+  /** Builder class for {@link DebugFrame}. */
+  @AutoValue.Builder
+  public abstract static class Builder {
+    public abstract Builder setLocation(@Nullable Location location);
+
+    public abstract Builder setFunctionName(String functionName);
+
+    public abstract Builder setLexicalFrameBindings(ImmutableMap<String, Object> bindings);
+
+    public abstract Builder setGlobalBindings(ImmutableMap<String, Object> bindings);
+
+    public abstract DebugFrame build();
+  }
+}