Assert that context creation doesn't throw

src/assert-scope.h

 // Copyright 2013 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.
 
 #ifndef V8_ASSERT_SCOPE_H_
 #define V8_ASSERT_SCOPE_H_
 
 #include <stdint.h>
 #include "src/base/macros.h"
 #include "src/globals.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class Isolate;
 class PerThreadAssertData;
 
 
 enum PerThreadAssertType {
   HEAP_ALLOCATION_ASSERT,
   HANDLE_ALLOCATION_ASSERT,
   HANDLE_DEREFERENCE_ASSERT,
   DEFERRED_HANDLE_DEREFERENCE_ASSERT,
   CODE_DEPENDENCY_CHANGE_ASSERT,
   LAST_PER_THREAD_ASSERT_TYPE
 };
 
-
 enum PerIsolateAssertType {
   JAVASCRIPT_EXECUTION_ASSERT,
   JAVASCRIPT_EXECUTION_THROWS,
   DEOPTIMIZATION_ASSERT,
-  COMPILATION_ASSERT
+  COMPILATION_ASSERT,
+  NO_EXCEPTION_ASSERT
 };
 
 template <PerThreadAssertType kType, bool kAllow>
 class PerThreadAssertScope {
  public:
   V8_EXPORT_PRIVATE PerThreadAssertScope();
   V8_EXPORT_PRIVATE ~PerThreadAssertScope();
 
   V8_EXPORT_PRIVATE static bool IsAllowed();
 
@@ skipping 95 matching lines @@
 // Per-isolate assert scopes.
 
 // Scope to document where we do not expect javascript execution.
 typedef PerIsolateAssertScope<JAVASCRIPT_EXECUTION_ASSERT, false>
     DisallowJavascriptExecution;
 
 // Scope to introduce an exception to DisallowJavascriptExecution.
 typedef PerIsolateAssertScope<JAVASCRIPT_EXECUTION_ASSERT, true>
     AllowJavascriptExecution;
 
+// Scope to document where we do not expect javascript execution (debug only)
+typedef PerIsolateAssertScopeDebugOnly<JAVASCRIPT_EXECUTION_ASSERT, false>
+    DisallowJavascriptExecutionDebugOnly;
+
+// Scope to introduce an exception to DisallowJavascriptExecutionDebugOnly.
+typedef PerIsolateAssertScopeDebugOnly<JAVASCRIPT_EXECUTION_ASSERT, true>
+    AllowJavascriptExecutionDebugOnly;
+
 // Scope in which javascript execution leads to exception being thrown.
 typedef PerIsolateAssertScope<JAVASCRIPT_EXECUTION_THROWS, false>
     ThrowOnJavascriptExecution;
 
 // Scope to introduce an exception to ThrowOnJavascriptExecution.
 typedef PerIsolateAssertScope<JAVASCRIPT_EXECUTION_THROWS, true>
     NoThrowOnJavascriptExecution;
 
 // Scope to document where we do not expect deoptimization.
 typedef PerIsolateAssertScopeDebugOnly<DEOPTIMIZATION_ASSERT, false>
     DisallowDeoptimization;
 
 // Scope to introduce an exception to DisallowDeoptimization.
 typedef PerIsolateAssertScopeDebugOnly<DEOPTIMIZATION_ASSERT, true>
     AllowDeoptimization;
 
 // Scope to document where we do not expect deoptimization.
 typedef PerIsolateAssertScopeDebugOnly<COMPILATION_ASSERT, false>
     DisallowCompilation;
 
 // Scope to introduce an exception to DisallowDeoptimization.
 typedef PerIsolateAssertScopeDebugOnly<COMPILATION_ASSERT, true>
     AllowCompilation;
+
+// Scope to document where we do not expect exceptions.
+typedef PerIsolateAssertScopeDebugOnly<NO_EXCEPTION_ASSERT, false>
+    DisallowExceptions;
+
+// Scope to introduce an exception to DisallowExceptions.
+typedef PerIsolateAssertScopeDebugOnly<NO_EXCEPTION_ASSERT, true>
+    AllowExceptions;
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ASSERT_SCOPE_H_