Optimize AOT's switchable calls for the monomorphic case.

runtime/vm/code_patcher_ia32.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/cpu.h"
@@ skipping 152 matching lines @@
   ASSERT(code.ContainsInstructionAt(return_address));
   StaticCall call(return_address);
   return call.target();
 }
 
 
 void CodePatcher::PatchStaticCallAt(uword return_address,
                                     const Code& code,
                                     const Code& new_target) {
   const Instructions& instrs = Instructions::Handle(code.instructions());
-  WritableInstructionsScope writable(instrs.EntryPoint(), instrs.size());
+  WritableInstructionsScope writable(instrs.PayloadStart(), instrs.size());
   ASSERT(code.ContainsInstructionAt(return_address));
   StaticCall call(return_address);
   call.set_target(new_target);
 }
 
 
 void CodePatcher::InsertDeoptimizationCallAt(uword start, uword target) {
   // The inserted call should not overlap the lazy deopt jump code.
   ASSERT(start + CallPattern::pattern_length_in_bytes() <= target);
   *reinterpret_cast<uint8_t*>(start) = 0xE8;
@@ skipping 21 matching lines @@
   ICData& ic_data = ICData::Handle();
   ic_data ^= static_call.ic_data();
   if (ic_data_result != NULL) {
     *ic_data_result = ic_data.raw();
   }
   return ic_data.GetTargetAt(0);
 }
 
 
 void CodePatcher::PatchSwitchableCallAt(uword return_address,
-                                        const Code& code,
-                                        const ICData& ic_data,
-                                        const MegamorphicCache& cache,
-                                        const Code& lookup_stub) {
+                                        const Code& caller_code,
+                                        const Object& data,
+                                        const Code& target) {
   // Switchable instance calls only generated for precompilation.
   UNREACHABLE();
 }
 
 
+RawCode* CodePatcher::GetSwitchableCallTargetAt(uword return_address,
+                                                const Code& caller_code) {
+  // Switchable instance calls only generated for precompilation.
+  UNREACHABLE();
+  return Code::null();
+}
+
+
+RawObject* CodePatcher::GetSwitchableCallDataAt(uword return_address,
+                                                const Code& caller_code) {
+  // Switchable instance calls only generated for precompilation.
+  UNREACHABLE();
+  return Object::null();
+}
+
+
 void CodePatcher::PatchNativeCallAt(uword return_address,
                                     const Code& code,
                                     NativeFunction target,
                                     const Code& trampoline) {
   UNREACHABLE();
 }
 
 
 RawCode* CodePatcher::GetNativeCallAt(uword return_address,
                                       const Code& code,
                                       NativeFunction* target) {
   UNREACHABLE();
   return NULL;
 }
 
 
 
 intptr_t CodePatcher::InstanceCallSizeInBytes() {
   return InstanceCall::kPatternSize;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32