Multiple stubs can point to the same calling convention.

src/arm64/interface-descriptors-arm64.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"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
 
 const Register InterfaceDescriptor::ContextRegister() { return cp; }
 
 
 void CallDescriptors::InitializeForIsolate(Isolate* isolate) {
   static PlatformInterfaceDescriptor default_descriptor =
       PlatformInterfaceDescriptor(CAN_INLINE_TARGET_ADDRESS);
 
   static PlatformInterfaceDescriptor noInlineDescriptor =
       PlatformInterfaceDescriptor(NEVER_INLINE_TARGET_ADDRESS);
 
+  InitializeForIsolateAllPlatforms(isolate);
+
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::FastNewClosureCall);
+    // cp: context
+    // x2: function info
+    Register registers[] = {cp, x2};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::FastNewContextCall);
+    // cp: context
+    // x1: function
+    Register registers[] = {cp, x1};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::ToNumberCall);
+    // cp: context
+    // x0: value
+    Register registers[] = {cp, x0};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::NumberToStringCall);
+    // cp: context
+    // x0: value
+    Register registers[] = {cp, x0};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::FastCloneShallowArrayCall);
+    // cp: context
+    // x3: array literals array
+    // x2: array literal index
+    // x1: constant elements
+    Register registers[] = {cp, x3, x2, x1};
+    Representation representations[] = {
+        Representation::Tagged(), Representation::Tagged(),
+        Representation::Smi(), Representation::Tagged()};
+    descriptor->Initialize(arraysize(registers), registers, representations);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::FastCloneShallowObjectCall);
+    // cp: context
+    // x3: object literals array
+    // x2: object literal index
+    // x1: constant properties
+    // x0: object literal flags
+    Register registers[] = {cp, x3, x2, x1, x0};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::CreateAllocationSiteCall);
+    // cp: context
+    // x2: feedback vector
+    // x3: call feedback slot
+    Register registers[] = {cp, x2, x3};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::CallFunctionCall);
+    // x1  function    the function to call
+    Register registers[] = {cp, x1};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::CallConstructCall);
+    // x0 : number of arguments
+    // x1 : the function to call
+    // x2 : feedback vector
+    // x3 : slot in feedback vector (smi) (if r2 is not the megamorphic symbol)
+    // TODO(turbofan): So far we don't gather type feedback and hence skip the
+    // slot parameter, but ArrayConstructStub needs the vector to be undefined.
+    Register registers[] = {cp, x0, x1, x2};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::RegExpConstructResultCall);
+    // cp: context
+    // x2: length
+    // x1: index (of last match)
+    // x0: string
+    Register registers[] = {cp, x2, x1, x0};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::TransitionElementsKindCall);
+    // cp: context
+    // x0: value (js_array)
+    // x1: to_map
+    Register registers[] = {cp, x0, x1};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor = isolate->call_descriptor(
+        CallDescriptorKey::ArrayConstructorConstantArgCountCall);
+    // cp: context
+    // x1: function
+    // x2: allocation site with elements kind
+    // x0: number of arguments to the constructor function
+    Register registers[] = {cp, x1, x2};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::ArrayConstructorCall);
+    // stack param count needs (constructor pointer, and single argument)
+    Register registers[] = {cp, x1, x2, x0};
+    Representation representations[] = {
+        Representation::Tagged(), Representation::Tagged(),
+        Representation::Tagged(), Representation::Integer32()};
+    descriptor->Initialize(arraysize(registers), registers, representations);
+  }
+  {
+    CallInterfaceDescriptor* descriptor = isolate->call_descriptor(
+        CallDescriptorKey::InternalArrayConstructorConstantArgCountCall);
+    // cp: context
+    // x1: constructor function
+    // x0: number of arguments to the constructor function
+    Register registers[] = {cp, x1};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor = isolate->call_descriptor(
+        CallDescriptorKey::InternalArrayConstructorCall);
+    // stack param count needs (constructor pointer, and single argument)
+    Register registers[] = {cp, x1, x0};
+    Representation representations[] = {Representation::Tagged(),
+                                        Representation::Tagged(),
+                                        Representation::Integer32()};
+    descriptor->Initialize(arraysize(registers), registers, representations);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::CompareNilCall);
+    // cp: context
+    // x0: value to compare
+    Register registers[] = {cp, x0};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::ToBooleanCall);
+    // cp: context
+    // x0: value
+    Register registers[] = {cp, x0};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::BinaryOpCall);
+    // cp: context
+    // x1: left operand
+    // x0: right operand
+    Register registers[] = {cp, x1, x0};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor = isolate->call_descriptor(
+        CallDescriptorKey::BinaryOpWithAllocationSiteCall);
+    // cp: context
+    // x2: allocation site
+    // x1: left operand
+    // x0: right operand
+    Register registers[] = {cp, x2, x1, x0};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(CallDescriptorKey::StringAddCall);
+    // cp: context
+    // x1: left operand
+    // x0: right operand
+    Register registers[] = {cp, x1, x0};
+    descriptor->Initialize(arraysize(registers), registers, NULL);
+  }
+
   {
     CallInterfaceDescriptor* descriptor =
         isolate->call_descriptor(CallDescriptorKey::ArgumentAdaptorCall);
     Register registers[] = {
         cp,  // context
         x1,  // JSFunction
         x0,  // actual number of arguments
         x2,  // expected number of arguments
     };
     Representation representations[] = {
@@ skipping 65 matching lines @@
         Representation::External(),  // api_function_address
     };
     descriptor->Initialize(arraysize(registers), registers, representations,
                            &default_descriptor);
   }
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64