Preview of a first step towards unification of hydrogen calls

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index f4a52480eb7a81a1cdafe90a1c4514aa5d891580..f19258bb46c42df3e2647bca0099fafb37f7f8c7 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -319,7 +319,7 @@ struct CodeStubInterfaceDescriptor {
     return has_miss_handler_;
   }
 
-  Register GetParameterRegister(int index) {
+  Register GetParameterRegister(int index) const {
     return register_params_[index];
   }
 
@@ -341,6 +341,41 @@ struct CodeStubInterfaceDescriptor {
 };
 
 
+struct PlatformCallInterfaceDescriptor;
+
+
+struct CallInterfaceDescriptor {
+  CallInterfaceDescriptor()
+      : register_param_count_(-1),
+        register_params_(NULL),
+        param_representations_(NULL),
+        platform_specific_descriptor_(NULL) { }
+
+  bool initialized() const { return register_param_count_ >= 0; }
+
+  int environment_length() const {
+    return register_param_count_;
+  }
+
+  Representation GetParameterRepresentation(int index) const {
+    return param_representations_[index];
+  }
+
+  Register GetParameterRegister(int index) const {
+    return register_params_[index];
+  }
+
+  PlatformCallInterfaceDescriptor* platform_specific_descriptor() const {
+    return platform_specific_descriptor_;
+  }
+
+  int register_param_count_;
+  Register* register_params_;
+  Representation* param_representations_;
+  PlatformCallInterfaceDescriptor* platform_specific_descriptor_;
+};
+
+
 class HydrogenCodeStub : public CodeStub {
  public:
   enum InitializationState {
@@ -2432,6 +2467,12 @@ class ProfileEntryHookStub : public PlatformCodeStub {
   DISALLOW_COPY_AND_ASSIGN(ProfileEntryHookStub);
 };
 
+
+class CallDescriptors {
+ public:
+  static void InitializeForIsolate(Isolate* isolate);
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_