Handlify CallStubCompiler::CompileCallField.

src/x64/stub-cache-x64.cc

 // 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 64 matching lines @@
 
   __ bind(&miss);
 }
 
 
 // Helper function used to check that the dictionary doesn't contain
 // the property. This function may return false negatives, so miss_label
 // must always call a backup property check that is complete.
 // This function is safe to call if the receiver has fast properties.
 // Name must be a symbol and receiver must be a heap object.
-MUST_USE_RESULT static MaybeObject* GenerateDictionaryNegativeLookup(
+static void GenerateDictionaryNegativeLookup(MacroAssembler* masm,
+                                                Label* miss_label,

[ulan, 2011/10/24 16:28:25]

Indentation is broken.

+                                                Register receiver,
+                                                Handle<String> name,
+                                                Register r0,
+                                                Register r1) {
+  ASSERT(name->IsSymbol());
+  Counters* counters = masm->isolate()->counters();
+  __ IncrementCounter(counters->negative_lookups(), 1);
+  __ IncrementCounter(counters->negative_lookups_miss(), 1);
+
+  __ movq(r0, FieldOperand(receiver, HeapObject::kMapOffset));
+
+  const int kInterceptorOrAccessCheckNeededMask =
+      (1 << Map::kHasNamedInterceptor) | (1 << Map::kIsAccessCheckNeeded);
+
+  // Bail out if the receiver has a named interceptor or requires access checks.
+  __ testb(FieldOperand(r0, Map::kBitFieldOffset),
+           Immediate(kInterceptorOrAccessCheckNeededMask));
+  __ j(not_zero, miss_label);
+
+  // Check that receiver is a JSObject.
+  __ CmpInstanceType(r0, FIRST_SPEC_OBJECT_TYPE);
+  __ j(below, miss_label);
+
+  // Load properties array.
+  Register properties = r0;
+  __ movq(properties, FieldOperand(receiver, JSObject::kPropertiesOffset));
+
+  // Check that the properties array is a dictionary.
+  __ CompareRoot(FieldOperand(properties, HeapObject::kMapOffset),
+                 Heap::kHashTableMapRootIndex);
+  __ j(not_equal, miss_label);
+
+  Label done;
+  StringDictionaryLookupStub::GenerateNegativeLookup(masm,
+                                                     miss_label,
+                                                     &done,
+                                                     properties,
+                                                     name,
+                                                     r1);
+  __ bind(&done);
+  __ DecrementCounter(counters->negative_lookups_miss(), 1);
+}
+
+
+// TODO(kmillikin): Eliminate this function when the stub cache is fully
+// handlified.
+MUST_USE_RESULT static MaybeObject* TryGenerateDictionaryNegativeLookup(
     MacroAssembler* masm,
     Label* miss_label,
     Register receiver,
     String* name,
     Register r0,
     Register r1) {
   ASSERT(name->IsSymbol());
   Counters* counters = masm->isolate()->counters();
   __ IncrementCounter(counters->negative_lookups(), 1);
   __ IncrementCounter(counters->negative_lookups_miss(), 1);
@@ skipping 15 matching lines @@
   // Load properties array.
   Register properties = r0;
   __ movq(properties, FieldOperand(receiver, JSObject::kPropertiesOffset));
 
   // Check that the properties array is a dictionary.
   __ CompareRoot(FieldOperand(properties, HeapObject::kMapOffset),
                  Heap::kHashTableMapRootIndex);
   __ j(not_equal, miss_label);
 
   Label done;
-  MaybeObject* result = StringDictionaryLookupStub::GenerateNegativeLookup(
+  MaybeObject* result = StringDictionaryLookupStub::TryGenerateNegativeLookup(
       masm,
       miss_label,
       &done,
       properties,
       name,
       r1);
   if (result->IsFailure()) return result;
 
   __ bind(&done);
   __ DecrementCounter(counters->negative_lookups_miss(), 1);
@@ skipping 173 matching lines @@
   __ TryGetFunctionPrototype(receiver, result, miss_label);
   if (!result.is(rax)) __ movq(rax, result);
   __ ret(0);
 }
 
 
 // Load a fast property out of a holder object (src). In-object properties
 // are loaded directly otherwise the property is loaded from the properties
 // fixed array.
 void StubCompiler::GenerateFastPropertyLoad(MacroAssembler* masm,
-                                            Register dst, Register src,
-                                            JSObject* holder, int index) {
+                                            Register dst,
+                                            Register src,
+                                            Handle<JSObject> holder,
+                                            int index) {
   // Adjust for the number of properties stored in the holder.
   index -= holder->map()->inobject_properties();
   if (index < 0) {
     // Get the property straight out of the holder.
     int offset = holder->map()->instance_size() + (index * kPointerSize);
     __ movq(dst, FieldOperand(src, offset));
   } else {
     // Calculate the offset into the properties array.
     int offset = index * kPointerSize + FixedArray::kHeaderSize;
     __ movq(dst, FieldOperand(src, JSObject::kPropertiesOffset));
@@ skipping 474 matching lines @@
   }
 
   // Return the value (register rax).
   __ ret(0);
 }
 
 
 // Generate code to check that a global property cell is empty. Create
 // the property cell at compilation time if no cell exists for the
 // property.
-MUST_USE_RESULT static MaybeObject* GenerateCheckPropertyCell(
+static void GenerateCheckPropertyCell(MacroAssembler* masm,
+                                      Handle<GlobalObject> global,
+                                      Handle<String> name,
+                                      Register scratch,
+                                      Label* miss) {
+  Handle<JSGlobalPropertyCell> cell =
+      GlobalObject::EnsurePropertyCell(global, name);
+  ASSERT(cell->value()->IsTheHole());
+  __ Move(scratch, cell);
+  __ Cmp(FieldOperand(scratch, JSGlobalPropertyCell::kValueOffset),
+         masm->isolate()->factory()->the_hole_value());
+  __ j(not_equal, miss);
+}
+
+
+// TODO(kmillikin): Eliminate this function when the stub cache is fully
+// handlified.
+MUST_USE_RESULT static MaybeObject* TryGenerateCheckPropertyCell(
     MacroAssembler* masm,
     GlobalObject* global,
     String* name,
     Register scratch,
     Label* miss) {
   Object* probe;
   { MaybeObject* maybe_probe = global->EnsurePropertyCell(name);
     if (!maybe_probe->ToObject(&probe)) return maybe_probe;
   }
   JSGlobalPropertyCell* cell = JSGlobalPropertyCell::cast(probe);
   ASSERT(cell->value()->IsTheHole());
   __ Move(scratch, Handle<Object>(cell));
   __ Cmp(FieldOperand(scratch, JSGlobalPropertyCell::kValueOffset),
          masm->isolate()->factory()->the_hole_value());
   __ j(not_equal, miss);
   return cell;
 }
 
 
+// Calls GenerateCheckPropertyCell for each global object in the prototype chain
+// from object to (but not including) holder.
+static void GenerateCheckPropertyCells(MacroAssembler* masm,
+                                       Handle<JSObject> object,
+                                       Handle<JSObject> holder,
+                                       Handle<String> name,
+                                       Register scratch,
+                                       Label* miss) {
+  Handle<JSObject> current = object;
+  while (!current.is_identical_to(holder)) {
+    if (current->IsGlobalObject()) {
+      GenerateCheckPropertyCell(masm,
+                                Handle<GlobalObject>::cast(current),
+                                name,
+                                scratch,
+                                miss);
+    }
+    current = Handle<JSObject>(JSObject::cast(current->GetPrototype()));
+  }
+}
+
+
+// TODO(kmillikin): Eliminate this function when the stub cache is fully
+// handlified.
+MUST_USE_RESULT static MaybeObject* TryGenerateCheckPropertyCells(
+    MacroAssembler* masm,
+    JSObject* object,
+    JSObject* holder,
+    String* name,
+    Register scratch,
+    Label* miss) {
+  JSObject* current = object;
+  while (current != holder) {
+    if (current->IsGlobalObject()) {
+      // Returns a cell or a failure.
+      MaybeObject* result = TryGenerateCheckPropertyCell(
+          masm,
+          GlobalObject::cast(current),
+          name,
+          scratch,
+          miss);
+      if (result->IsFailure()) return result;
+    }
+    ASSERT(current->IsJSObject());
+    current = JSObject::cast(current->GetPrototype());
+  }
+  return NULL;
+}
+
+
 #undef __
 #define __ ACCESS_MASM((masm()))
 
 
+Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
+                                       Register object_reg,
+                                       Handle<JSObject> holder,
+                                       Register holder_reg,
+                                       Register scratch1,
+                                       Register scratch2,
+                                       Handle<String> name,
+                                       int save_at_depth,
+                                       Label* miss) {
+  // Make sure there's no overlap between holder and object registers.
+  ASSERT(!scratch1.is(object_reg) && !scratch1.is(holder_reg));
+  ASSERT(!scratch2.is(object_reg) && !scratch2.is(holder_reg)
+         && !scratch2.is(scratch1));
+
+  // Keep track of the current object in register reg.  On the first
+  // iteration, reg is an alias for object_reg, on later iterations,
+  // it is an alias for holder_reg.
+  Register reg = object_reg;
+  int depth = 0;
+
+  if (save_at_depth == depth) {
+    __ movq(Operand(rsp, kPointerSize), object_reg);
+  }
+
+  // Check the maps in the prototype chain.
+  // Traverse the prototype chain from the object and do map checks.
+  Handle<JSObject> current = object;
+  while (!current.is_identical_to(holder)) {
+    ++depth;
+
+    // Only global objects and objects that do not require access
+    // checks are allowed in stubs.
+    ASSERT(current->IsJSGlobalProxy() || !current->IsAccessCheckNeeded());
+
+    Handle<JSObject> prototype(JSObject::cast(current->GetPrototype()));
+    if (!current->HasFastProperties() &&
+        !current->IsJSGlobalObject() &&
+        !current->IsJSGlobalProxy()) {
+      if (!name->IsSymbol()) {
+        name = factory()->LookupSymbol(name);
+      }
+      ASSERT(current->property_dictionary()->FindEntry(*name) ==
+             StringDictionary::kNotFound);
+
+      GenerateDictionaryNegativeLookup(masm(), miss, reg, name,
+                                       scratch1, scratch2);
+
+      __ movq(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
+      reg = holder_reg;  // From now on the object will be in holder_reg.
+      __ movq(reg, FieldOperand(scratch1, Map::kPrototypeOffset));
+    } else {
+      bool in_new_space = heap()->InNewSpace(*prototype);
+      Handle<Map> current_map(current->map());
+      if (in_new_space) {
+        // Save the map in scratch1 for later.
+        __ movq(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
+        __ Cmp(scratch1, current_map);
+      } else {
+        __ Cmp(FieldOperand(reg, HeapObject::kMapOffset), current_map);
+      }
+      // Branch on the result of the map check.
+      __ j(not_equal, miss);
+      // Check access rights to the global object.  This has to happen after
+      // the map check so that we know that the object is actually a global
+      // object.
+      if (current->IsJSGlobalProxy()) {
+        __ CheckAccessGlobalProxy(reg, scratch2, miss);
+      }
+      reg = holder_reg;  // From now on the object will be in holder_reg.
+
+      if (in_new_space) {
+        // The prototype is in new space; we cannot store a reference to it
+        // in the code.  Load it from the map.
+        __ movq(reg, FieldOperand(scratch1, Map::kPrototypeOffset));
+      } else {
+        // The prototype is in old space; load it directly.
+        __ Move(reg, prototype);
+      }
+    }
+
+    if (save_at_depth == depth) {
+      __ movq(Operand(rsp, kPointerSize), reg);
+    }
+
+    // Go to the next object in the prototype chain.
+    current = prototype;
+  }
+  ASSERT(current.is_identical_to(holder));
+
+  // Log the check depth.
+  LOG(isolate(), IntEvent("check-maps-depth", depth + 1));
+
+  // Check the holder map.
+  __ Cmp(FieldOperand(reg, HeapObject::kMapOffset), Handle<Map>(holder->map()));
+  __ j(not_equal, miss);
+
+  // Perform security check for access to the global object.
+  ASSERT(current->IsJSGlobalProxy() || !current->IsAccessCheckNeeded());
+  if (current->IsJSGlobalProxy()) {
+    __ CheckAccessGlobalProxy(reg, scratch1, miss);
+  }
+
+  // If we've skipped any global objects, it's not enough to verify that
+  // their maps haven't changed.  We also need to check that the property
+  // cell for the property is still empty.
+  GenerateCheckPropertyCells(masm(), object, holder, name, scratch1, miss);
+
+  // Return the register containing the holder.
+  return reg;
+}
+
+
 Register StubCompiler::CheckPrototypes(JSObject* object,
                                        Register object_reg,
                                        JSObject* holder,
                                        Register holder_reg,
                                        Register scratch1,
                                        Register scratch2,
                                        String* name,
                                        int save_at_depth,
                                        Label* miss) {
   // Make sure there's no overlap between holder and object registers.
@@ skipping 30 matching lines @@
         if (lookup_result->IsFailure()) {
           set_failure(Failure::cast(lookup_result));
           return reg;
         } else {
           name = String::cast(lookup_result->ToObjectUnchecked());
         }
       }
       ASSERT(current->property_dictionary()->FindEntry(name) ==
              StringDictionary::kNotFound);
 
-      MaybeObject* negative_lookup = GenerateDictionaryNegativeLookup(masm(),
-                                                                      miss,
-                                                                      reg,
-                                                                      name,
-                                                                      scratch1,
-                                                                      scratch2);
+      MaybeObject* negative_lookup =
+          TryGenerateDictionaryNegativeLookup(masm(),
+                                              miss,
+                                              reg,
+                                              name,
+                                              scratch1,
+                                              scratch2);
       if (negative_lookup->IsFailure()) {
         set_failure(Failure::cast(negative_lookup));
         return reg;
       }
 
       __ movq(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
       reg = holder_reg;  // from now the object is in holder_reg
       __ movq(reg, FieldOperand(scratch1, Map::kPrototypeOffset));
     } else if (heap()->InNewSpace(prototype)) {
       // Get the map of the current object.
@@ skipping 52 matching lines @@
   // the holder register.
   ASSERT(current == holder);
   ASSERT(current->IsJSGlobalProxy() || !current->IsAccessCheckNeeded());
   if (current->IsJSGlobalProxy()) {
     __ CheckAccessGlobalProxy(reg, scratch1, miss);
   }
 
   // If we've skipped any global objects, it's not enough to verify
   // that their maps haven't changed.  We also need to check that the
   // property cell for the property is still empty.
-  current = object;
-  while (current != holder) {
-    if (current->IsGlobalObject()) {
-      MaybeObject* cell = GenerateCheckPropertyCell(masm(),
-                                                    GlobalObject::cast(current),
-                                                    name,
-                                                    scratch1,
-                                                    miss);
-      if (cell->IsFailure()) {
-        set_failure(Failure::cast(cell));
-        return reg;
-      }
-    }
-    current = JSObject::cast(current->GetPrototype());
-  }
+  MaybeObject* result = TryGenerateCheckPropertyCells(masm(),
+                                                      object,
+                                                      holder,
+                                                      name,
+                                                      scratch1,
+                                                      miss);
+  if (result->IsFailure()) set_failure(Failure::cast(result));

[ulan, 2011/10/24 16:28:25]

The result can be NULL. It works but looks suspicious. :)

 
   // Return the register containing the holder.
   return reg;
 }
 
 
 void StubCompiler::GenerateLoadField(JSObject* object,
                                      JSObject* holder,
                                      Register receiver,
                                      Register scratch1,
                                      Register scratch2,
                                      Register scratch3,
                                      int index,
                                      String* name,
                                      Label* miss) {
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(receiver, miss);
 
   // Check the prototype chain.
   Register reg =
       CheckPrototypes(object, receiver, holder,
                       scratch1, scratch2, scratch3, name, miss);
 
   // Get the value from the properties.
-  GenerateFastPropertyLoad(masm(), rax, reg, holder, index);
+  GenerateFastPropertyLoad(masm(), rax, reg, Handle<JSObject>(holder), index);
   __ ret(0);
 }
 
 
 MaybeObject* StubCompiler::GenerateLoadCallback(JSObject* object,
                                                 JSObject* holder,
                                                 Register receiver,
                                                 Register name_reg,
                                                 Register scratch1,
                                                 Register scratch2,
@@ skipping 178 matching lines @@
                                    scratch2,
                                    scratch3,
                                    name,
                                    miss);
     }
 
     if (lookup->type() == FIELD) {
       // We found FIELD property in prototype chain of interceptor's holder.
       // Retrieve a field from field's holder.
       GenerateFastPropertyLoad(masm(), rax, holder_reg,
-                               lookup->holder(), lookup->GetFieldIndex());
+                               Handle<JSObject>(lookup->holder()),
+                               lookup->GetFieldIndex());
       __ ret(0);
     } else {
       // We found CALLBACKS property in prototype chain of interceptor's
       // holder.
       ASSERT(lookup->type() == CALLBACKS);
       ASSERT(lookup->GetCallbackObject()->IsAccessorInfo());
       AccessorInfo* callback = AccessorInfo::cast(lookup->GetCallbackObject());
       ASSERT(callback != NULL);
       ASSERT(callback->getter() != NULL);
 
@@ skipping 25 matching lines @@
                              name_reg, interceptor_holder);
     __ push(scratch2);  // restore old return address
 
     ExternalReference ref = ExternalReference(
         IC_Utility(IC::kLoadPropertyWithInterceptorForLoad), isolate());
     __ TailCallExternalReference(ref, 5, 1);
   }
 }
 
 
-void CallStubCompiler::GenerateNameCheck(String* name, Label* miss) {
+void CallStubCompiler::GenerateNameCheck(Handle<String> name, Label* miss) {
   if (kind_ == Code::KEYED_CALL_IC) {
-    __ Cmp(rcx, Handle<String>(name));
+    __ Cmp(rcx, name);
     __ j(not_equal, miss);
   }
 }
 
 
 void CallStubCompiler::GenerateGlobalReceiverCheck(JSObject* object,
                                                    JSObject* holder,
                                                    String* name,
                                                    Label* miss) {
   ASSERT(holder->IsGlobalObject());
@@ skipping 38 matching lines @@
     __ Move(rax, Handle<SharedFunctionInfo>(function->shared()));
     __ cmpq(FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset), rax);
     __ j(not_equal, miss);
   } else {
     __ Cmp(rdi, Handle<JSFunction>(function));
     __ j(not_equal, miss);
   }
 }
 
 
-MaybeObject* CallStubCompiler::GenerateMissBranch() {
+void CallStubCompiler::GenerateMissBranch() {
+  Handle<Code> code =
+      isolate()->stub_cache()->ComputeCallMiss(arguments().immediate(),
+                                               kind_,
+                                               extra_state_);
+  __ Jump(code, RelocInfo::CODE_TARGET);
+}
+
+
+// TODO(kmillikin): Eliminate this function when the stub cache is fully
+// handlified.
+MaybeObject* CallStubCompiler::TryGenerateMissBranch() {
   MaybeObject* maybe_obj =
       isolate()->stub_cache()->TryComputeCallMiss(arguments().immediate(),
                                                   kind_,
                                                   extra_state_);
   Object* obj;
   if (!maybe_obj->ToObject(&obj)) return maybe_obj;
   __ Jump(Handle<Code>(Code::cast(obj)), RelocInfo::CODE_TARGET);
   return obj;
 }
 
 
-MaybeObject* CallStubCompiler::CompileCallField(JSObject* object,
-                                                JSObject* holder,
+Handle<Code> CallStubCompiler::CompileCallField(Handle<JSObject> object,
+                                                Handle<JSObject> holder,
                                                 int index,
-                                                String* name) {
+                                                Handle<String> name) {
   // ----------- S t a t e -------------
   // rcx                 : function name
   // rsp[0]              : return address
   // rsp[8]              : argument argc
   // rsp[16]             : argument argc - 1
   // ...
   // rsp[argc * 8]       : argument 1
   // rsp[(argc + 1) * 8] : argument 0 = receiver
   // -----------------------------------
   Label miss;
@@ skipping 26 matching lines @@
   }
 
   // Invoke the function.
   CallKind call_kind = CallICBase::Contextual::decode(extra_state_)
       ? CALL_AS_FUNCTION
       : CALL_AS_METHOD;
   __ InvokeFunction(rdi, arguments(), JUMP_FUNCTION,
                     NullCallWrapper(), call_kind);
 
   // Handle call cache miss.
-  __ bind(&miss);
-  MaybeObject* maybe_result = GenerateMissBranch();
-  if (maybe_result->IsFailure()) return maybe_result;
+  __ bind(&miss);GenerateMissBranch();

[ulan, 2011/10/24 16:28:25]

New line between statements.

 
   // Return the generated code.
   return GetCode(FIELD, name);
 }
 
 
 MaybeObject* CallStubCompiler::CompileArrayPushCall(Object* object,
                                                     JSObject* holder,
                                                     JSGlobalPropertyCell* cell,
                                                     JSFunction* function,
                                                     String* name) {
   // ----------- S t a t e -------------
   //  -- rcx                 : name
   //  -- rsp[0]              : return address
   //  -- rsp[(argc - n) * 8] : arg[n] (zero-based)
   //  -- ...
   //  -- rsp[(argc + 1) * 8] : receiver
   // -----------------------------------
 
   // If object is not an array, bail out to regular call.
   if (!object->IsJSArray() || cell != NULL) return heap()->undefined_value();
 
   Label miss;
 
-  GenerateNameCheck(name, &miss);
+  GenerateNameCheck(Handle<String>(name), &miss);
 
   // Get the receiver from the stack.
   const int argc = arguments().immediate();
   __ movq(rdx, Operand(rsp, (argc + 1) * kPointerSize));
 
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(rdx, &miss);
 
   CheckPrototypes(JSObject::cast(object),
                   rdx,
@@ skipping 138 matching lines @@
     }
 
     __ bind(&call_builtin);
     __ TailCallExternalReference(ExternalReference(Builtins::c_ArrayPush,
                                                    isolate()),
                                  argc + 1,
                                  1);
   }
 
   __ bind(&miss);
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return GetCode(function);
+  return TryGetCode(function);
 }
 
 
 MaybeObject* CallStubCompiler::CompileArrayPopCall(Object* object,
                                                    JSObject* holder,
                                                    JSGlobalPropertyCell* cell,
                                                    JSFunction* function,
                                                    String* name) {
   // ----------- S t a t e -------------
   //  -- rcx                 : name
   //  -- rsp[0]              : return address
   //  -- rsp[(argc - n) * 8] : arg[n] (zero-based)
   //  -- ...
   //  -- rsp[(argc + 1) * 8] : receiver
   // -----------------------------------
 
   // If object is not an array, bail out to regular call.
   if (!object->IsJSArray() || cell != NULL) return heap()->undefined_value();
 
   Label miss, return_undefined, call_builtin;
 
-  GenerateNameCheck(name, &miss);
+  GenerateNameCheck(Handle<String>(name), &miss);
 
   // Get the receiver from the stack.
   const int argc = arguments().immediate();
   __ movq(rdx, Operand(rsp, (argc + 1) * kPointerSize));
 
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(rdx, &miss);
 
   CheckPrototypes(JSObject::cast(object), rdx,
                   holder, rbx,
@@ skipping 36 matching lines @@
   __ LoadRoot(rax, Heap::kUndefinedValueRootIndex);
   __ ret((argc + 1) * kPointerSize);
 
   __ bind(&call_builtin);
   __ TailCallExternalReference(
       ExternalReference(Builtins::c_ArrayPop, isolate()),
       argc + 1,
       1);
 
   __ bind(&miss);
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return GetCode(function);
+  return TryGetCode(function);
 }
 
 
 MaybeObject* CallStubCompiler::CompileStringCharCodeAtCall(
     Object* object,
     JSObject* holder,
     JSGlobalPropertyCell* cell,
     JSFunction* function,
     String* name) {
   // ----------- S t a t e -------------
@@ skipping 13 matching lines @@
   Label name_miss;
   Label index_out_of_range;
   Label* index_out_of_range_label = &index_out_of_range;
 
   if (kind_ == Code::CALL_IC &&
       (CallICBase::StringStubState::decode(extra_state_) ==
        DEFAULT_STRING_STUB)) {
     index_out_of_range_label = &miss;
   }
 
-  GenerateNameCheck(name, &name_miss);
+  GenerateNameCheck(Handle<String>(name), &name_miss);
 
   // Check that the maps starting from the prototype haven't changed.
   GenerateDirectLoadGlobalFunctionPrototype(masm(),
                                             Context::STRING_FUNCTION_INDEX,
                                             rax,
                                             &miss);
   ASSERT(object != holder);
   CheckPrototypes(JSObject::cast(object->GetPrototype()), rax, holder,
                   rbx, rdx, rdi, name, &miss);
 
@@ skipping 25 matching lines @@
   if (index_out_of_range.is_linked()) {
     __ bind(&index_out_of_range);
     __ LoadRoot(rax, Heap::kNanValueRootIndex);
     __ ret((argc + 1) * kPointerSize);
   }
 
   __ bind(&miss);
   // Restore function name in rcx.
   __ Move(rcx, Handle<String>(name));
   __ bind(&name_miss);
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return GetCode(function);
+  return TryGetCode(function);
 }
 
 
 MaybeObject* CallStubCompiler::CompileStringCharAtCall(
     Object* object,
     JSObject* holder,
     JSGlobalPropertyCell* cell,
     JSFunction* function,
     String* name) {
   // ----------- S t a t e -------------
@@ skipping 13 matching lines @@
   Label name_miss;
   Label index_out_of_range;
   Label* index_out_of_range_label = &index_out_of_range;
 
   if (kind_ == Code::CALL_IC &&
       (CallICBase::StringStubState::decode(extra_state_) ==
        DEFAULT_STRING_STUB)) {
     index_out_of_range_label = &miss;
   }
 
-  GenerateNameCheck(name, &name_miss);
+  GenerateNameCheck(Handle<String>(name), &name_miss);
 
   // Check that the maps starting from the prototype haven't changed.
   GenerateDirectLoadGlobalFunctionPrototype(masm(),
                                             Context::STRING_FUNCTION_INDEX,
                                             rax,
                                             &miss);
   ASSERT(object != holder);
   CheckPrototypes(JSObject::cast(object->GetPrototype()), rax, holder,
                   rbx, rdx, rdi, name, &miss);
 
@@ skipping 27 matching lines @@
   if (index_out_of_range.is_linked()) {
     __ bind(&index_out_of_range);
     __ LoadRoot(rax, Heap::kEmptyStringRootIndex);
     __ ret((argc + 1) * kPointerSize);
   }
 
   __ bind(&miss);
   // Restore function name in rcx.
   __ Move(rcx, Handle<String>(name));
   __ bind(&name_miss);
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return GetCode(function);
+  return TryGetCode(function);
 }
 
 
 MaybeObject* CallStubCompiler::CompileStringFromCharCodeCall(
     Object* object,
     JSObject* holder,
     JSGlobalPropertyCell* cell,
     JSFunction* function,
     String* name) {
   // ----------- S t a t e -------------
   //  -- rcx                 : function name
   //  -- rsp[0]              : return address
   //  -- rsp[(argc - n) * 8] : arg[n] (zero-based)
   //  -- ...
   //  -- rsp[(argc + 1) * 8] : receiver
   // -----------------------------------
 
   const int argc = arguments().immediate();
 
   // If the object is not a JSObject or we got an unexpected number of
   // arguments, bail out to the regular call.
   if (!object->IsJSObject() || argc != 1) return heap()->undefined_value();
 
   Label miss;
-  GenerateNameCheck(name, &miss);
+  GenerateNameCheck(Handle<String>(name), &miss);
 
   if (cell == NULL) {
     __ movq(rdx, Operand(rsp, 2 * kPointerSize));
 
     __ JumpIfSmi(rdx, &miss);
 
     CheckPrototypes(JSObject::cast(object), rdx, holder, rbx, rax, rdi, name,
                     &miss);
   } else {
     ASSERT(cell->value() == function);
@@ skipping 23 matching lines @@
   // because the function makes no use of it.
   __ bind(&slow);
   CallKind call_kind = CallICBase::Contextual::decode(extra_state_)
       ? CALL_AS_FUNCTION
       : CALL_AS_METHOD;
   __ InvokeFunction(function, arguments(), JUMP_FUNCTION,
                     NullCallWrapper(), call_kind);
 
   __ bind(&miss);
   // rcx: function name.
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return (cell == NULL) ? GetCode(function) : GetCode(NORMAL, name);
+  return (cell == NULL) ? TryGetCode(function) : TryGetCode(NORMAL, name);
 }
 
 
 MaybeObject* CallStubCompiler::CompileMathFloorCall(Object* object,
                                                     JSObject* holder,
                                                     JSGlobalPropertyCell* cell,
                                                     JSFunction* function,
                                                     String* name) {
   // TODO(872): implement this.
   return heap()->undefined_value();
@@ skipping 13 matching lines @@
   //  -- rsp[(argc + 1) * 8] : receiver
   // -----------------------------------
 
   const int argc = arguments().immediate();
 
   // If the object is not a JSObject or we got an unexpected number of
   // arguments, bail out to the regular call.
   if (!object->IsJSObject() || argc != 1) return heap()->undefined_value();
 
   Label miss;
-  GenerateNameCheck(name, &miss);
+  GenerateNameCheck(Handle<String>(name), &miss);
 
   if (cell == NULL) {
     __ movq(rdx, Operand(rsp, 2 * kPointerSize));
 
     __ JumpIfSmi(rdx, &miss);
 
     CheckPrototypes(JSObject::cast(object), rdx, holder, rbx, rax, rdi, name,
                     &miss);
   } else {
     ASSERT(cell->value() == function);
@@ skipping 58 matching lines @@
   // because the function makes no use of it.
   __ bind(&slow);
   CallKind call_kind = CallICBase::Contextual::decode(extra_state_)
       ? CALL_AS_FUNCTION
       : CALL_AS_METHOD;
   __ InvokeFunction(function, arguments(), JUMP_FUNCTION,
                     NullCallWrapper(), call_kind);
 
   __ bind(&miss);
   // rcx: function name.
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return (cell == NULL) ? GetCode(function) : GetCode(NORMAL, name);
+  return (cell == NULL) ? TryGetCode(function) : TryGetCode(NORMAL, name);
 }
 
 
 MaybeObject* CallStubCompiler::CompileFastApiCall(
     const CallOptimization& optimization,
     Object* object,
     JSObject* holder,
     JSGlobalPropertyCell* cell,
     JSFunction* function,
     String* name) {
   ASSERT(optimization.is_simple_api_call());
   // Bail out if object is a global object as we don't want to
   // repatch it to global receiver.
   if (object->IsGlobalObject()) return heap()->undefined_value();
   if (cell != NULL) return heap()->undefined_value();
   if (!object->IsJSObject()) return heap()->undefined_value();
   int depth = optimization.GetPrototypeDepthOfExpectedType(
             JSObject::cast(object), holder);
   if (depth == kInvalidProtoDepth) return heap()->undefined_value();
 
   Label miss, miss_before_stack_reserved;
 
-  GenerateNameCheck(name, &miss_before_stack_reserved);
+  GenerateNameCheck(Handle<String>(name), &miss_before_stack_reserved);
 
   // Get the receiver from the stack.
   const int argc = arguments().immediate();
   __ movq(rdx, Operand(rsp, (argc + 1) * kPointerSize));
 
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(rdx, &miss_before_stack_reserved);
 
   Counters* counters = isolate()->counters();
   __ IncrementCounter(counters->call_const(), 1);
@@ skipping 11 matching lines @@
   __ movq(rax, Operand(rsp, 3 * kPointerSize));
   __ movq(Operand(rsp, 0 * kPointerSize), rax);
 
   MaybeObject* result = GenerateFastApiCall(masm(), optimization, argc);
   if (result->IsFailure()) return result;
 
   __ bind(&miss);
   __ addq(rsp, Immediate(kFastApiCallArguments * kPointerSize));
 
   __ bind(&miss_before_stack_reserved);
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return GetCode(function);
+  return TryGetCode(function);
 }
 
 
 MaybeObject* CallStubCompiler::CompileCallConstant(Object* object,
                                                    JSObject* holder,
                                                    JSFunction* function,
                                                    String* name,
                                                    CheckType check) {
   // ----------- S t a t e -------------
   // rcx                 : function name
   // rsp[0]              : return address
   // rsp[8]              : argument argc
   // rsp[16]             : argument argc - 1
   // ...
   // rsp[argc * 8]       : argument 1
   // rsp[(argc + 1) * 8] : argument 0 = receiver
   // -----------------------------------
 
   if (HasCustomCallGenerator(function)) {
     MaybeObject* maybe_result = CompileCustomCall(
         object, holder, NULL, function, name);
     Object* result;
     if (!maybe_result->ToObject(&result)) return maybe_result;
     // undefined means bail out to regular compiler.
     if (!result->IsUndefined()) return result;
   }
 
   Label miss;
 
-  GenerateNameCheck(name, &miss);
+  GenerateNameCheck(Handle<String>(name), &miss);
 
   // Get the receiver from the stack.
   const int argc = arguments().immediate();
   __ movq(rdx, Operand(rsp, (argc + 1) * kPointerSize));
 
   // Check that the receiver isn't a smi.
   if (check != NUMBER_CHECK) {
     __ JumpIfSmi(rdx, &miss);
   }
 
@@ skipping 84 matching lines @@
   }
 
   CallKind call_kind = CallICBase::Contextual::decode(extra_state_)
       ? CALL_AS_FUNCTION
       : CALL_AS_METHOD;
   __ InvokeFunction(function, arguments(), JUMP_FUNCTION,
                     NullCallWrapper(), call_kind);
 
   // Handle call cache miss.
   __ bind(&miss);
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return GetCode(function);
+  return TryGetCode(function);
 }
 
 
 MaybeObject* CallStubCompiler::CompileCallInterceptor(JSObject* object,
                                                       JSObject* holder,
                                                       String* name) {
   // ----------- S t a t e -------------
   // rcx                 : function name
   // rsp[0]              : return address
   // rsp[8]              : argument argc
   // rsp[16]             : argument argc - 1
   // ...
   // rsp[argc * 8]       : argument 1
   // rsp[(argc + 1) * 8] : argument 0 = receiver
   // -----------------------------------
   Label miss;
 
-  GenerateNameCheck(name, &miss);
+  GenerateNameCheck(Handle<String>(name), &miss);
 
   // Get the number of arguments.
   const int argc = arguments().immediate();
 
   LookupResult lookup(isolate());
   LookupPostInterceptor(holder, name, &lookup);
 
   // Get the receiver from the stack.
   __ movq(rdx, Operand(rsp, (argc + 1) * kPointerSize));
 
@@ skipping 28 matching lines @@
   // Invoke the function.
   __ movq(rdi, rax);
   CallKind call_kind = CallICBase::Contextual::decode(extra_state_)
       ? CALL_AS_FUNCTION
       : CALL_AS_METHOD;
   __ InvokeFunction(rdi, arguments(), JUMP_FUNCTION,
                     NullCallWrapper(), call_kind);
 
   // Handle load cache miss.
   __ bind(&miss);
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return GetCode(INTERCEPTOR, name);
+  return TryGetCode(INTERCEPTOR, name);
 }
 
 
 MaybeObject* CallStubCompiler::CompileCallGlobal(JSObject* object,
                                                  GlobalObject* holder,
                                                  JSGlobalPropertyCell* cell,
                                                  JSFunction* function,
                                                  String* name) {
   // ----------- S t a t e -------------
   // rcx                 : function name
   // rsp[0]              : return address
   // rsp[8]              : argument argc
   // rsp[16]             : argument argc - 1
   // ...
   // rsp[argc * 8]       : argument 1
   // rsp[(argc + 1) * 8] : argument 0 = receiver
   // -----------------------------------
 
   if (HasCustomCallGenerator(function)) {
     MaybeObject* maybe_result = CompileCustomCall(
         object, holder, cell, function, name);
     Object* result;
     if (!maybe_result->ToObject(&result)) return maybe_result;
     // undefined means bail out to regular compiler.
     if (!result->IsUndefined()) return result;
   }
 
   Label miss;
 
-  GenerateNameCheck(name, &miss);
+  GenerateNameCheck(Handle<String>(name), &miss);
 
   // Get the number of arguments.
   const int argc = arguments().immediate();
 
   GenerateGlobalReceiverCheck(object, holder, name, &miss);
 
   GenerateLoadFunctionFromCell(cell, function, &miss);
 
   // Patch the receiver on the stack with the global proxy.
   if (object->IsGlobalObject()) {
@@ skipping 14 matching lines @@
   // We call indirectly through the code field in the function to
   // allow recompilation to take effect without changing any of the
   // call sites.
   __ movq(rdx, FieldOperand(rdi, JSFunction::kCodeEntryOffset));
   __ InvokeCode(rdx, expected, arguments(), JUMP_FUNCTION,
                 NullCallWrapper(), call_kind);
 
   // Handle call cache miss.
   __ bind(&miss);
   __ IncrementCounter(counters->call_global_inline_miss(), 1);
-  MaybeObject* maybe_result = GenerateMissBranch();
+  MaybeObject* maybe_result = TryGenerateMissBranch();
   if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
-  return GetCode(NORMAL, name);
+  return TryGetCode(NORMAL, name);
 }
 
 
 MaybeObject* StoreStubCompiler::CompileStoreField(JSObject* object,
                                                   int index,
                                                   Map* transition,
                                                   String* name) {
   // ----------- S t a t e -------------
   //  -- rax    : value
   //  -- rcx    : name
@@ skipping 299 matching lines @@
   __ JumpIfSmi(rax, &miss);
 
   // Check the maps of the full prototype chain. Also check that
   // global property cells up to (but not including) the last object
   // in the prototype chain are empty.
   CheckPrototypes(object, rax, last, rbx, rdx, rdi, name, &miss);
 
   // If the last object in the prototype chain is a global object,
   // check that the global property cell is empty.
   if (last->IsGlobalObject()) {
-    MaybeObject* cell = GenerateCheckPropertyCell(masm(),
-                                                  GlobalObject::cast(last),
-                                                  name,
-                                                  rdx,
-                                                  &miss);
+    MaybeObject* cell = TryGenerateCheckPropertyCell(masm(),
+                                                     GlobalObject::cast(last),
+                                                     name,
+                                                     rdx,
+                                                     &miss);
     if (cell->IsFailure()) {
       miss.Unuse();
       return cell;
     }
   }
 
   // Return undefined if maps of the full prototype chain are still the
   // same and no global property with this name contains a value.
   __ LoadRoot(rax, Heap::kUndefinedValueRootIndex);
   __ ret(0);
@@ skipping 1121 matching lines @@
   Handle<Code> ic_miss = masm->isolate()->builtins()->KeyedStoreIC_Miss();
   __ jmp(ic_miss, RelocInfo::CODE_TARGET);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64