Enable lazy compilation for non-trivial outer contexts.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5430 matching lines @@
 
   // Indicate that this function only consists of assignments of the form
   // this.x = y; where y is either a constant or refers to an argument.
   inline bool has_only_simple_this_property_assignments();
 
   // Indicates if this function can be lazy compiled.
   // This is used to determine if we can safely flush code from a function
   // when doing GC if we expect that the function will no longer be used.
   DECL_BOOLEAN_ACCESSORS(allows_lazy_compilation)
 
+  // Indicates if this function can be lazy compiled without a context.
+  // This is used to determine if we can force compilation without reaching
+  // the function through program execution but through other means (e.g. heap
+  // iteration by the debugger).
+  DECL_BOOLEAN_ACCESSORS(allows_lazy_compilation_without_context)
+
   // Indicates how many full GCs this function has survived with assigned
   // code object. Used to determine when it is relatively safe to flush
   // this code object and replace it with lazy compilation stub.
   // Age is reset when GC notices that the code object is referenced
   // from the stack or compilation cache.
   inline int code_age();
   inline void set_code_age(int age);
 
   // Indicates whether optimizations have been disabled for this
   // shared function info. If a function is repeatedly optimized or if
@@ skipping 126 matching lines @@
     SharedFunctionInfoPrint(stdout);
   }
   void SharedFunctionInfoPrint(FILE* out);
 #endif
 #ifdef DEBUG
   void SharedFunctionInfoVerify();
 #endif
 
   void ResetForNewContext(int new_ic_age);
 
-  // Helpers to compile the shared code.  Returns true on success, false on
-  // failure (e.g., stack overflow during compilation).
-  static bool EnsureCompiled(Handle<SharedFunctionInfo> shared,
-                             ClearExceptionFlag flag);
+  // Helper to compile the shared code.  Returns true on success, false on
+  // failure (e.g., stack overflow during compilation). This is only used by
+  // the debugger, it is not possible to compile without a context otherwise.
   static bool CompileLazy(Handle<SharedFunctionInfo> shared,
                           ClearExceptionFlag flag);
 
   void SharedFunctionInfoIterateBody(ObjectVisitor* v);
 
   // Casting.
   static inline SharedFunctionInfo* cast(Object* obj);
 
   // Constants.
   static const int kDontAdaptArgumentsSentinel = -1;
@@ skipping 113 matching lines @@
   static const int kStartPositionShift = 2;
   static const int kStartPositionMask = ~((1 << kStartPositionShift) - 1);
 
   // Bit positions in compiler_hints.
   static const int kCodeAgeSize = 3;
   static const int kCodeAgeMask = (1 << kCodeAgeSize) - 1;
 
   enum CompilerHints {
     kHasOnlySimpleThisPropertyAssignments,
     kAllowLazyCompilation,
+    kAllowLazyCompilationWithoutContext,
     kLiveObjectsMayExist,
     kCodeAgeShift,
     kOptimizationDisabled = kCodeAgeShift + kCodeAgeSize,
     kStrictModeFunction,
     kExtendedModeFunction,
     kUsesArguments,
     kHasDuplicateParameters,
     kNative,
     kBoundFunction,
     kIsAnonymous,
@@ skipping 128 matching lines @@
 
   // Tells whether or not this function can be optimized.
   inline bool IsOptimizable();
 
   // Mark this function for lazy recompilation. The function will be
   // recompiled the next time it is executed.
   void MarkForLazyRecompilation();
 
   // Helpers to compile this function.  Returns true on success, false on
   // failure (e.g., stack overflow during compilation).
+  static bool EnsureCompiled(Handle<JSFunction> function,
+                             ClearExceptionFlag flag);
   static bool CompileLazy(Handle<JSFunction> function,
                           ClearExceptionFlag flag);
   static bool CompileOptimized(Handle<JSFunction> function,
                                int osr_ast_id,
                                ClearExceptionFlag flag);
 
   // Tells whether or not the function is already marked for lazy
   // recompilation.
   inline bool IsMarkedForLazyRecompilation();
 
@@ skipping 2876 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_