[debugger] infrastructure for side-effect-free debug-evaluate.

src/objects.h

 // 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 7357 matching lines @@
 
   // A function has debug code if the compiled code has debug break slots.
   inline bool HasDebugCode();
 
   // [debug info]: Debug information.
   DECL_ACCESSORS(debug_info, Object)
 
   // The function's name if it is non-empty, otherwise the inferred name.
   String* DebugName();
 
+  // The function cannot cause any side effects.
+  bool HasNoSideEffect();
+
   // Used for flags such as --hydrogen-filter.
   bool PassesFilter(const char* raw_filter);
 
   // Position of the 'function' token in the script source.
   inline int function_token_position() const;
   inline void set_function_token_position(int function_token_position);
 
   // Position of this function in the script source.
   inline int start_position() const;
   inline void set_start_position(int start_position);
@@ skipping 89 matching lines @@
 
   // Whether this function was created from a FunctionDeclaration.
   DECL_BOOLEAN_ACCESSORS(is_declaration)
 
   // Whether this function was marked to be tiered up.
   DECL_BOOLEAN_ACCESSORS(marked_for_tier_up)
 
   // Indicates that asm->wasm conversion failed and should not be re-attempted.
   DECL_BOOLEAN_ACCESSORS(is_asm_wasm_broken)
 
+  // Indicates that the function cannot cause side-effects.
+  DECL_BOOLEAN_ACCESSORS(has_no_side_effect)
+
+  // Indicates that |has_no_side_effect| has been computed and set.
+  DECL_BOOLEAN_ACCESSORS(computed_has_no_side_effect)
+
   inline FunctionKind kind() const;
   inline void set_kind(FunctionKind kind);
 
   // Indicates whether or not the code in the shared function support
   // deoptimization.
   inline bool has_deoptimization_support();
 
   // Enable deoptimization support through recompiled code.
   void EnableDeoptimizationSupport(Code* recompiled);
 
@@ skipping 266 matching lines @@
     kIsFunction,
     kMustUseIgnitionTurbo,
     kDontFlush,
     kIsDeclaration,
     // byte 2
     kFunctionKind,
     // rest of byte 2 and first two bits of byte 3 are used by FunctionKind
     // byte 3
     kDeserialized = kFunctionKind + 10,
     kIsAsmWasmBroken,
+    kHasNoSideEffect,
+    kComputedHasNoSideEffect,
     kCompilerHintsCount,  // Pseudo entry
   };
   // kFunctionKind has to be byte-aligned
   STATIC_ASSERT((kFunctionKind % kBitsPerByte) == 0);
 
   class FunctionKindBits : public BitField<FunctionKind, kFunctionKind, 10> {};
 
   class DeoptCountBits : public BitField<int, 0, 4> {};
   class OptReenableTriesBits : public BitField<int, 4, 18> {};
   class ICAgeBits : public BitField<int, 22, 8> {};
@@ skipping 3965 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_