StubCallInterfaceDescriptor takes a context register.

src/code-stubs.cc

 // Copyright 2012 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.
 
 #include "src/v8.h"
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/cpu-profiler.h"
 #include "src/factory.h"
 #include "src/gdb-jit.h"
 #include "src/macro-assembler.h"
 #include "src/stub-cache.h"
 
 namespace v8 {
 namespace internal {
 
 
+InterfaceDescriptor::InterfaceDescriptor()
+    : register_param_count_(-1) { }
+
+
 CodeStubInterfaceDescriptor::CodeStubInterfaceDescriptor()
-    : register_param_count_(-1),
-      stack_parameter_count_(no_reg),
+    : stack_parameter_count_(no_reg),
       hint_stack_parameter_count_(-1),
       function_mode_(NOT_JS_FUNCTION_STUB_MODE),
       deoptimization_handler_(NULL),
       handler_arguments_mode_(DONT_PASS_ARGUMENTS),
       miss_handler_(),
       has_miss_handler_(false) { }
 
 
-void CodeStubInterfaceDescriptor::Initialize(
+void InterfaceDescriptor::Initialize(
     int register_parameter_count,
     Register* registers,
-    Address deoptimization_handler,
-    Representation* register_param_representations,
-    int hint_stack_parameter_count,
-    StubFunctionMode function_mode) {
-  // CodeStubInterfaceDescriptor owns a copy of the registers array.
+    Representation* register_param_representations) {
   register_param_count_ = register_parameter_count;
+
+  // An interface descriptor must have a context register.
+  ASSERT(register_parameter_count > 0 && registers[0].is(ContextRegister()));
+
+  // InterfaceDescriptor owns a copy of the registers array.
   register_params_.Reset(NewArray<Register>(register_parameter_count));
   for (int i = 0; i < register_parameter_count; i++) {
     register_params_[i] = registers[i];
   }
 
   // If a representations array is specified, then the descriptor owns that as
   // well.
   if (register_param_representations != NULL) {
     register_param_representations_.Reset(
         NewArray<Representation>(register_parameter_count));
     for (int i = 0; i < register_parameter_count; i++) {
+      // If there is a context register, the representation must be tagged.
+      ASSERT(i != 0 || register_param_representations[i].Equals(
+          Representation::Tagged()));
       register_param_representations_[i] = register_param_representations[i];
     }
   }
+}
+
+
+void CodeStubInterfaceDescriptor::Initialize(
+    int register_parameter_count,
+    Register* registers,
+    Address deoptimization_handler,
+    Representation* register_param_representations,
+    int hint_stack_parameter_count,
+    StubFunctionMode function_mode) {
+  InterfaceDescriptor::Initialize(register_parameter_count, registers,
+                                  register_param_representations);
 
   deoptimization_handler_ = deoptimization_handler;
 
   hint_stack_parameter_count_ = hint_stack_parameter_count;
   function_mode_ = function_mode;
 }
 
 
 void CodeStubInterfaceDescriptor::Initialize(
     int register_parameter_count,
@@ skipping 12 matching lines @@
   stack_parameter_count_ = stack_parameter_count;
   handler_arguments_mode_ = handler_mode;
 }
 
 
 void CallInterfaceDescriptor::Initialize(
     int register_parameter_count,
     Register* registers,
     Representation* param_representations,
     PlatformCallInterfaceDescriptor* platform_descriptor) {
-  // CallInterfaceDescriptor owns a copy of the registers array.
-  register_param_count_ = register_parameter_count;
-  register_params_.Reset(NewArray<Register>(register_parameter_count));
-  for (int i = 0; i < register_parameter_count; i++) {
-    register_params_[i] = registers[i];
-  }
-
-  // Also the register parameter representations.
-  param_representations_.Reset(
-      NewArray<Representation>(register_parameter_count));
-  for (int i = 0; i < register_parameter_count; i++) {
-    param_representations_[i] = param_representations[i];
-  }
+  InterfaceDescriptor::Initialize(register_parameter_count, registers,
+                                  param_representations);
 
   platform_specific_descriptor_ = platform_descriptor;
 }
 
 
 bool CodeStub::FindCodeInCache(Code** code_out) {
   UnseededNumberDictionary* stubs = isolate()->heap()->code_stubs();
   int index = stubs->FindEntry(GetKey());
   if (index != UnseededNumberDictionary::kNotFound) {
     *code_out = Code::cast(stubs->ValueAt(index));
@@ skipping 459 matching lines @@
 void JSEntryStub::FinishCode(Handle<Code> code) {
   Handle<FixedArray> handler_table =
       code->GetIsolate()->factory()->NewFixedArray(1, TENURED);
   handler_table->set(0, Smi::FromInt(handler_offset_));
   code->set_handler_table(*handler_table);
 }
 
 
 void KeyedLoadFastElementStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { LoadIC::ReceiverRegister(),
+  Register registers[] = { InterfaceDescriptor::ContextRegister(),
+                           LoadIC::ReceiverRegister(),
                            LoadIC::NameRegister() };
   STATIC_ASSERT(LoadIC::kRegisterArgumentCount == 2);
   descriptor->Initialize(ARRAY_SIZE(registers), registers,
                          FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure));
 }
 
 
 void KeyedLoadDictionaryElementStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { LoadIC::ReceiverRegister(),
+  Register registers[] = { InterfaceDescriptor::ContextRegister(),
+                           LoadIC::ReceiverRegister(),
                            LoadIC::NameRegister() };
   STATIC_ASSERT(LoadIC::kRegisterArgumentCount == 2);
   descriptor->Initialize(ARRAY_SIZE(registers), registers,
                          FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure));
 }
 
 
 void KeyedLoadGenericElementStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { LoadIC::ReceiverRegister(),
+  Register registers[] = { InterfaceDescriptor::ContextRegister(),
+                           LoadIC::ReceiverRegister(),
                            LoadIC::NameRegister() };
   STATIC_ASSERT(LoadIC::kRegisterArgumentCount == 2);
   descriptor->Initialize(
       ARRAY_SIZE(registers), registers,
       Runtime::FunctionForId(Runtime::kKeyedGetProperty)->entry);
 }
 
 
 void LoadFieldStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { LoadIC::ReceiverRegister() };
+  Register registers[] = { InterfaceDescriptor::ContextRegister(),
+                           LoadIC::ReceiverRegister() };
   descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void KeyedLoadFieldStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { LoadIC::ReceiverRegister() };
+  Register registers[] = { InterfaceDescriptor::ContextRegister(),
+                           LoadIC::ReceiverRegister() };
   descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void StringLengthStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { LoadIC::ReceiverRegister(),
+  Register registers[] = { InterfaceDescriptor::ContextRegister(),
+                           LoadIC::ReceiverRegister(),
                            LoadIC::NameRegister() };
   descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void KeyedStringLengthStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { LoadIC::ReceiverRegister(),
+  Register registers[] = { InterfaceDescriptor::ContextRegister(),
+                           LoadIC::ReceiverRegister(),
                            LoadIC::NameRegister() };
   descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void KeyedStoreFastElementStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { KeyedStoreIC::ReceiverRegister(),
+  Register registers[] = { InterfaceDescriptor::ContextRegister(),
+                           KeyedStoreIC::ReceiverRegister(),
                            KeyedStoreIC::NameRegister(),
                            KeyedStoreIC::ValueRegister() };
   descriptor->Initialize(
       ARRAY_SIZE(registers), registers,
       FUNCTION_ADDR(KeyedStoreIC_MissFromStubFailure));
 }
 
 
 void StoreGlobalStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { StoreIC::ReceiverRegister(),
+  Register registers[] = { InterfaceDescriptor::ContextRegister(),
+                           StoreIC::ReceiverRegister(),
                            StoreIC::NameRegister(),
                            StoreIC::ValueRegister() };
   descriptor->Initialize(ARRAY_SIZE(registers), registers,
                          FUNCTION_ADDR(StoreIC_MissFromStubFailure));
 }
 
 
 void KeyedLoadDictionaryElementPlatformStub::Generate(
     MacroAssembler* masm) {
   KeyedLoadStubCompiler::GenerateLoadDictionaryElement(masm);
@@ skipping 301 matching lines @@
   InstallDescriptor(isolate, &stub3);
 }
 
 InternalArrayConstructorStub::InternalArrayConstructorStub(
     Isolate* isolate) : PlatformCodeStub(isolate) {
   InternalArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
 }
 
 
 } }  // namespace v8::internal