[interpreter, debugger] implement debugger statement.

test/cctest/compiler/test-run-bytecode-graph-builder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <utility>
 
 #include "src/compiler/pipeline.h"
 #include "src/execution.h"
 #include "src/handles.h"
 #include "src/interpreter/bytecode-array-builder.h"
@@ skipping 2698 matching lines @@
     SNPrintF(script, "function %s() { %s }\n%s();", kFunctionName,
              snippets[i].code_snippet, kFunctionName);
 
     BytecodeGraphTester tester(isolate, zone, script.start());
     auto callable = tester.GetCallable<>();
     Handle<Object> return_value = callable().ToHandleChecked();
     CHECK(return_value->SameValue(*snippets[i].return_value()));
   }
 }
 
+TEST(BytecodeGraphBuilderDebuggerStatement) {
+  FLAG_expose_debug_as = "debug";
+  HandleAndZoneScope scope;
+  Isolate* isolate = scope.main_isolate();
+  Zone* zone = scope.main_zone();
+
+  ExpectedSnippet<0> snippet = {
+      "var Debug = debug.Debug;"
+      "var count = 0;"
+      "function f() {"
+      "  debugger;"
+      "}"
+      "function listener(event) {"
+      "  if (event == Debug.DebugEvent.Break) count++;"
+      "}"
+      "Debug.setListener(listener);"
+      "f();"
+      "Debug.setListener(null);"
+      "return count;",
+      {handle(Smi::FromInt(1), isolate)}};
+
+  ScopedVector<char> script(1024);
+  SNPrintF(script, "function %s() { %s }\n%s();", kFunctionName,
+           snippet.code_snippet, kFunctionName);
+
+  BytecodeGraphTester tester(isolate, zone, script.start());
+  auto callable = tester.GetCallable<>();
+  Handle<Object> return_value = callable().ToHandleChecked();
+  CHECK(return_value->SameValue(*snippet.return_value()));
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8