Optimize AOT's switchable calls for the monomorphic case.

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 3942 matching lines @@
   friend class Class;
   friend class Object;
   friend class RawObjectPool;
 };
 
 
 class Instructions : public Object {
  public:
   intptr_t size() const { return raw_ptr()->size_; }  // Excludes HeaderSize().
 
-  uword EntryPoint() const {
-    return EntryPoint(raw());
+  uword PayloadStart() const {
+    return PayloadStart(raw());
   }
-  static uword EntryPoint(RawInstructions* instr) {
+  uword UncheckedEntryPoint() const {
+    return UncheckedEntryPoint(raw());
+  }
+  uword CheckedEntryPoint() const {
+    return CheckedEntryPoint(raw());
+  }
+  static uword PayloadStart(RawInstructions* instr) {
     return reinterpret_cast<uword>(instr->ptr()) + HeaderSize();
   }
 
+#if defined(TARGET_ARCH_IA32)
+  static const intptr_t kCheckedEntryOffset = 0;
+  static const intptr_t kUncheckedEntryOffset = 0;
+#elif defined(TARGET_ARCH_X64)
+  static const intptr_t kCheckedEntryOffset = 23;
+  static const intptr_t kUncheckedEntryOffset = 44;
+#elif defined(TARGET_ARCH_ARM)
+  static const intptr_t kCheckedEntryOffset = 3 * Instr::kInstrSize;
+  static const intptr_t kUncheckedEntryOffset = 9 * Instr::kInstrSize;
+#elif defined(TARGET_ARCH_ARM64)
+  static const intptr_t kCheckedEntryOffset = 6 * Instr::kInstrSize;
+  static const intptr_t kUncheckedEntryOffset = 12 * Instr::kInstrSize;
+#elif defined(TARGET_ARCH_MIPS)
+  static const intptr_t kCheckedEntryOffset = 4 * Instr::kInstrSize;
+  static const intptr_t kUncheckedEntryOffset = 14 * Instr::kInstrSize;
+#elif defined(TARGET_ARCH_DBC)
+  static const intptr_t kCheckedEntryOffset = 0;
+  static const intptr_t kUncheckedEntryOffset = 0;
+#else
+#error Missing entry offsets for current architecture
+#endif
+
+  static uword UncheckedEntryPoint(RawInstructions* instr) {
+    return PayloadStart(instr) + kUncheckedEntryOffset;
+  }
+  static uword CheckedEntryPoint(RawInstructions* instr) {
+    return PayloadStart(instr) + kCheckedEntryOffset;
+  }
+
   static const intptr_t kMaxElements = (kMaxInt32 -
                                         (sizeof(RawInstructions) +
                                          sizeof(RawObject) +
                                          (2 * OS::kMaxPreferredCodeAlignment)));
 
   static intptr_t InstanceSize() {
     ASSERT(sizeof(RawInstructions) ==
            OFFSET_OF_RETURNED_VALUE(RawInstructions, data));
     return 0;
   }
 
   static intptr_t InstanceSize(intptr_t size) {
     intptr_t instructions_size = Utils::RoundUp(size,
                                                 OS::PreferredCodeAlignment());
     intptr_t result = instructions_size + HeaderSize();
     ASSERT(result % OS::PreferredCodeAlignment() == 0);
     return result;
   }
 
   static intptr_t HeaderSize() {
     intptr_t alignment = OS::PreferredCodeAlignment();
     return Utils::RoundUp(sizeof(RawInstructions), alignment);
   }
 
-  static RawInstructions* FromEntryPoint(uword entry_point) {
+  static RawInstructions* FromUncheckedEntryPoint(uword entry_point) {
     return reinterpret_cast<RawInstructions*>(
-        entry_point - HeaderSize() + kHeapObjectTag);
+        entry_point - HeaderSize() - kUncheckedEntryOffset + kHeapObjectTag);
   }
 
   bool Equals(const Instructions& other) const {
     if (size() != other.size()) {
       return false;
     }
     NoSafepointScope no_safepoint;
     return memcmp(raw_ptr(), other.raw_ptr(), InstanceSize(size())) == 0;
   }
 
@@ skipping 431 matching lines @@
 
   RawInstructions* instructions() const { return raw_ptr()->instructions_; }
 
   static intptr_t saved_instructions_offset() {
     return OFFSET_OF(RawCode, instructions_);
   }
 
   static intptr_t entry_point_offset() {
     return OFFSET_OF(RawCode, entry_point_);
   }
+  static intptr_t checked_entry_point_offset() {
+    return OFFSET_OF(RawCode, checked_entry_point_);
+  }
 
   RawObjectPool* object_pool() const { return raw_ptr()->object_pool_; }
   static intptr_t object_pool_offset() {
     return OFFSET_OF(RawCode, object_pool_);
   }
 
   intptr_t pointer_offsets_length() const {
     return PtrOffBits::decode(raw_ptr()->state_bits_);
   }
 
   bool is_optimized() const {
     return OptimizedBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_optimized(bool value) const;
   bool is_alive() const {
     return AliveBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_alive(bool value) const;
 
-  uword EntryPoint() const {
-    return Instructions::Handle(instructions()).EntryPoint();
+  uword PayloadStart() const {
+    return Instructions::PayloadStart(instructions());
+  }
+  uword UncheckedEntryPoint() const {
+    return Instructions::UncheckedEntryPoint(instructions());
+  }
+  uword CheckedEntryPoint() const {
+    return Instructions::CheckedEntryPoint(instructions());
   }
   intptr_t Size() const {
     const Instructions& instr = Instructions::Handle(instructions());
     return instr.size();
   }
   RawObjectPool* GetObjectPool() const {
     return object_pool();
   }
   bool ContainsInstructionAt(uword addr) const {
     const Instructions& instr = Instructions::Handle(instructions());
-    const uword offset = addr - instr.EntryPoint();
+    const uword offset = addr - instr.PayloadStart();
     return offset < static_cast<uword>(instr.size());
   }
 
   // Returns true if there is a debugger breakpoint set in this code object.
   bool HasBreakpoint() const;
 
   RawPcDescriptors* pc_descriptors() const {
     return raw_ptr()->pc_descriptors_;
   }
   void set_pc_descriptors(const PcDescriptors& descriptors) const {
@@ skipping 4244 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_