Version 3.6.5

src/code-stubs.h

 // Copyright 2011 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 27 matching lines @@
 #define CODE_STUB_LIST_ALL_PLATFORMS(V)  \
   V(CallFunction)                        \
   V(UnaryOp)                             \
   V(BinaryOp)                            \
   V(StringAdd)                           \
   V(SubString)                           \
   V(StringCompare)                       \
   V(Compare)                             \
   V(CompareIC)                           \
   V(MathPow)                             \
+  V(RecordWrite)                         \
+  V(StoreBufferOverflow)                 \
+  V(RegExpExec)                          \
   V(TranscendentalCache)                 \
   V(Instanceof)                          \
-  /* All stubs above this line only exist in a few versions, which are  */  \
-  /* generated ahead of time.  Therefore compiling a call to one of     */  \
-  /* them can't cause a new stub to be compiled, so compiling a call to */  \
-  /* them is GC safe.  The ones below this line exist in many variants  */  \
-  /* so code compiling a call to one can cause a GC.  This means they   */  \
-  /* can't be called from other stubs, since stub generation code is    */  \
-  /* not GC safe.                                                       */  \
   V(ConvertToDouble)                     \
   V(WriteInt32ToHeapNumber)              \
   V(StackCheck)                          \
   V(FastNewClosure)                      \
   V(FastNewContext)                      \
   V(FastCloneShallowArray)               \
   V(RevertToNumber)                      \
   V(ToBoolean)                           \
   V(ToNumber)                            \
   V(CounterOp)                           \
   V(ArgumentsAccess)                     \
-  V(RegExpExec)                          \
   V(RegExpConstructResult)               \
   V(NumberToString)                      \
   V(CEntry)                              \
   V(JSEntry)                             \
   V(KeyedLoadElement)                    \
   V(KeyedStoreElement)                   \
   V(DebuggerStatement)                   \
-  V(StringDictionaryNegativeLookup)
+  V(StringDictionaryLookup)
 
 // List of code stubs only used on ARM platforms.
 #ifdef V8_TARGET_ARCH_ARM
 #define CODE_STUB_LIST_ARM(V)  \
   V(GetProperty)               \
   V(SetProperty)               \
   V(InvokeBuiltin)             \
   V(RegExpCEntry)              \
   V(DirectCEntry)
 #else
@@ skipping 48 matching lines @@
 
   // Gets the major key from a code object that is a code stub or binary op IC.
   static Major GetMajorKey(Code* code_stub) {
     return static_cast<Major>(code_stub->major_key());
   }
 
   static const char* MajorName(Major major_key, bool allow_unknown_keys);
 
   virtual ~CodeStub() {}
 
+  bool CompilingCallsToThisStubIsGCSafe() {
+    bool is_pregenerated = IsPregenerated();
+    Code* code = NULL;
+    CHECK(!is_pregenerated || FindCodeInCache(&code));
+    return is_pregenerated;
+  }
+
+  // See comment above, where Instanceof is defined.
+  virtual bool IsPregenerated() { return false; }
+
+  static void GenerateStubsAheadOfTime();
+  static void GenerateFPStubs();
+
+  // Some stubs put untagged junk on the stack that cannot be scanned by the
+  // GC.  This means that we must be statically sure that no GC can occur while
+  // they are running.  If that is the case they should override this to return
+  // true, which will cause an assertion if we try to call something that can
+  // GC or if we try to put a stack frame on top of the junk, which would not
+  // result in a traversable stack.
+  virtual bool SometimesSetsUpAFrame() { return true; }
+
  protected:
   static const int kMajorBits = 6;
   static const int kMinorBits = kBitsPerInt - kSmiTagSize - kMajorBits;
 
  private:
   // Lookup the code in the (possibly custom) cache.
   bool FindCodeInCache(Code** code_out);
 
   // Nonvirtual wrapper around the stub-specific Generate function.  Call
   // this function to set up the macro assembler and generate the code.
   void GenerateCode(MacroAssembler* masm);
 
   // Generates the assembler code for the stub.
   virtual void Generate(MacroAssembler* masm) = 0;
 
   // Perform bookkeeping required after code generation when stub code is
   // initially generated.
   void RecordCodeGeneration(Code* code, MacroAssembler* masm);
 
   // Finish the code object after it has been generated.
   virtual void FinishCode(Code* code) { }
 
+  // Returns true if TryGetCode should fail if it failed
+  // to register newly generated stub in the stub cache.
+  virtual bool MustBeInStubCache() { return false; }
+
+  // Activate newly generated stub. Is called after
+  // registering stub in the stub cache.
+  virtual void Activate(Code* code) { }
+
   // Returns information for computing the number key.
   virtual Major MajorKey() = 0;
   virtual int MinorKey() = 0;
 
   // BinaryOpStub needs to override this.
   virtual int GetCodeKind();
 
   // BinaryOpStub needs to override this.
   virtual InlineCacheState GetICState() {
     return UNINITIALIZED;
   }
 
   // Returns a name for logging/debugging purposes.
   SmartArrayPointer<const char> GetName();
-  virtual void PrintName(StringStream* stream) {
-    stream->Add("%s", MajorName(MajorKey(), false));
-  }
+  virtual void PrintName(StringStream* stream);
 
   // Returns whether the code generated for this stub needs to be allocated as
   // a fixed (non-moveable) code object.
   virtual bool NeedsImmovableCode() { return false; }
 
   // Computes the key based on major and minor.
   uint32_t GetKey() {
     ASSERT(static_cast<int>(MajorKey()) < NUMBER_OF_IDS);
     return MinorKeyBits::encode(MinorKey()) |
            MajorKeyBits::encode(MajorKey());
   }
 
-  // See comment above, where Instanceof is defined.
-  bool AllowsStubCalls() { return MajorKey() <= Instanceof; }
-
   class MajorKeyBits: public BitField<uint32_t, 0, kMajorBits> {};
   class MinorKeyBits: public BitField<uint32_t, kMajorBits, kMinorBits> {};
 
   friend class BreakPointIterator;
 };
 
 
 // Helper interface to prepare to/restore after making runtime calls.
 class RuntimeCallHelper {
  public:
@@ skipping 315 matching lines @@
                          Register scratch);
 
   // Unfortunately you have to run without snapshots to see most of these
   // names in the profile since most compare stubs end up in the snapshot.
   virtual void PrintName(StringStream* stream);
 };
 
 
 class CEntryStub : public CodeStub {
  public:
-  explicit CEntryStub(int result_size)
-      : result_size_(result_size), save_doubles_(false) { }
+  explicit CEntryStub(int result_size,
+                      SaveFPRegsMode save_doubles = kDontSaveFPRegs)
+      : result_size_(result_size), save_doubles_(save_doubles) { }
 
   void Generate(MacroAssembler* masm);
-  void SaveDoubles() { save_doubles_ = true; }
+
+  // The version of this stub that doesn't save doubles is generated ahead of
+  // time, so it's OK to call it from other stubs that can't cope with GC during
+  // their code generation.  On machines that always have gp registers (x64) we
+  // can generate both variants ahead of time.
+  virtual bool IsPregenerated();
+  static void GenerateAheadOfTime();
 
  private:
   void GenerateCore(MacroAssembler* masm,
                     Label* throw_normal_exception,
                     Label* throw_termination_exception,
                     Label* throw_out_of_memory_exception,
                     bool do_gc,
                     bool always_allocate_scope);
   void GenerateThrowTOS(MacroAssembler* masm);
   void GenerateThrowUncatchable(MacroAssembler* masm,
                                 UncatchableExceptionType type);
 
   // Number of pointers/values returned.
   const int result_size_;
-  bool save_doubles_;
+  SaveFPRegsMode save_doubles_;
 
   Major MajorKey() { return CEntry; }
   int MinorKey();
 
   bool NeedsImmovableCode();
 };
 
 
 class JSEntryStub : public CodeStub {
  public:
@@ skipping 76 matching lines @@
 };
 
 
 class CallFunctionStub: public CodeStub {
  public:
   CallFunctionStub(int argc, CallFunctionFlags flags)
       : argc_(argc), flags_(flags) { }
 
   void Generate(MacroAssembler* masm);
 
+  virtual void FinishCode(Code* code);
+
+  static void Clear(Heap* heap, Address address);
+
+  static Object* GetCachedValue(Address address);
+
   static int ExtractArgcFromMinorKey(int minor_key) {
     return ArgcBits::decode(minor_key);
   }
 
+  // The object that indicates an uninitialized cache.
+  static Handle<Object> UninitializedSentinel(Isolate* isolate) {
+    return isolate->factory()->the_hole_value();
+  }
+
+  // A raw version of the uninitialized sentinel that's safe to read during
+  // garbage collection (e.g., for patching the cache).
+  static Object* RawUninitializedSentinel(Heap* heap) {
+    return heap->raw_unchecked_the_hole_value();
+  }
+
+  // The object that indicates a megamorphic state.
+  static Handle<Object> MegamorphicSentinel(Isolate* isolate) {
+    return isolate->factory()->undefined_value();
+  }
+
  private:
   int argc_;
   CallFunctionFlags flags_;
 
   virtual void PrintName(StringStream* stream);
 
   // Minor key encoding in 32 bits with Bitfield <Type, shift, size>.
-  class FlagBits: public BitField<CallFunctionFlags, 0, 1> {};
-  class ArgcBits: public BitField<unsigned, 1, 32 - 1> {};
+  class FlagBits: public BitField<CallFunctionFlags, 0, 2> {};
+  class ArgcBits: public BitField<unsigned, 2, 32 - 2> {};
 
   Major MajorKey() { return CallFunction; }
   int MinorKey() {
     // Encode the parameters in a unique 32 bit value.
     return FlagBits::encode(flags_) | ArgcBits::encode(argc_);
   }
 
   bool ReceiverMightBeImplicit() {
     return (flags_ & RECEIVER_MIGHT_BE_IMPLICIT) != 0;
   }
+
+  bool RecordCallTarget() {
+    return (flags_ & RECORD_CALL_TARGET) != 0;
+  }
 };
 
 
 enum StringIndexFlags {
   // Accepts smis or heap numbers.
   STRING_INDEX_IS_NUMBER,
 
   // Accepts smis or heap numbers that are valid array indices
   // (ECMA-262 15.4). Invalid indices are reported as being out of
   // range.
@@ skipping 244 matching lines @@
   static Types no_types() { return Types(); }
   static Types all_types() { return Types((1 << NUMBER_OF_TYPES) - 1); }
 
   explicit ToBooleanStub(Register tos, Types types = Types())
       : tos_(tos), types_(types) { }
 
   void Generate(MacroAssembler* masm);
   virtual int GetCodeKind() { return Code::TO_BOOLEAN_IC; }
   virtual void PrintName(StringStream* stream);
 
+  virtual bool SometimesSetsUpAFrame() { return false; }
+
  private:
   Major MajorKey() { return ToBoolean; }
   int MinorKey() { return (tos_.code() << NUMBER_OF_TYPES) | types_.ToByte(); }
 
   virtual void FinishCode(Code* code) {
     code->set_to_boolean_state(types_.ToByte());
   }
 
   void CheckOddball(MacroAssembler* masm,
                     Type type,
                     Heap::RootListIndex value,
                     bool result);
   void GenerateTypeTransition(MacroAssembler* masm);
 
   Register tos_;
   Types types_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_