VM: New calling convention for generated code.

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 2148 matching lines @@
   void AttachCode(const Code& value) const;
   void SetInstructions(const Code& value) const;
   void ClearCode() const;
 
   // Disables optimized code and switches to unoptimized code.
   void SwitchToUnoptimizedCode() const;
 
   // Return the most recently compiled and installed code for this function.
   // It is not the only Code object that points to this function.
   RawCode* CurrentCode() const {
-    return raw_ptr()->instructions_->ptr()->code_;
+    return raw_ptr()->code_;
   }
 
   RawCode* unoptimized_code() const { return raw_ptr()->unoptimized_code_; }
   void set_unoptimized_code(const Code& value) const;
   bool HasCode() const;
 
+  static intptr_t code_offset() {
+    return OFFSET_OF(RawFunction, code_);
+  }
+
   static intptr_t entry_point_offset() {
     return OFFSET_OF(RawFunction, entry_point_);
   }
 
   // Returns true if there is at least one debugger breakpoint
   // set in this function.
   bool HasBreakpoint() const;
 
   RawContextScope* context_scope() const;
   void set_context_scope(const ContextScope& value) const;
@@ skipping 1517 matching lines @@
   FINAL_HEAP_OBJECT_IMPLEMENTATION(ObjectPool, Object);
   friend class Class;
   friend class Object;
   friend class RawObjectPool;
 };
 
 
 class Instructions : public Object {
  public:
   intptr_t size() const { return raw_ptr()->size_; }  // Excludes HeaderSize().
-  RawCode* code() const { return raw_ptr()->code_; }
-  static intptr_t code_offset() {
-    return OFFSET_OF(RawInstructions, code_);
-  }
-  RawObjectPool* object_pool() const { return raw_ptr()->object_pool_; }
-  static intptr_t object_pool_offset() {
-    return OFFSET_OF(RawInstructions, object_pool_);
-  }
 
   uword EntryPoint() const {
     return reinterpret_cast<uword>(raw_ptr()) + HeaderSize();
   }
 
   static const intptr_t kMaxElements = (kMaxInt32 -
                                         (sizeof(RawInstructions) +
                                          sizeof(RawObject) +
                                          (2 * OS::kMaxPreferredCodeAlignment)));
 
@@ skipping 18 matching lines @@
 
   static RawInstructions* FromEntryPoint(uword entry_point) {
     return reinterpret_cast<RawInstructions*>(
         entry_point - HeaderSize() + kHeapObjectTag);
   }
 
  private:
   void set_size(intptr_t size) const {
     StoreNonPointer(&raw_ptr()->size_, size);
   }
-  void set_code(RawCode* code) const {
-    StorePointer(&raw_ptr()->code_, code);
-  }
-  void set_object_pool(RawObjectPool* object_pool) const {
-    StorePointer(&raw_ptr()->object_pool_, object_pool);
-  }
 
   // New is a private method as RawInstruction and RawCode objects should
   // only be created using the Code::FinalizeCode method. This method creates
   // the RawInstruction and RawCode objects, sets up the pointer offsets
   // and links the two in a GC safe manner.
   static RawInstructions* New(intptr_t size);
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(Instructions, Object);
   friend class Class;
   friend class Code;
@@ skipping 311 matching lines @@
  private:
   static void UnpackInto(const Array& table,
                          const TypedData& packed,
                          GrowableArray<DeoptInstr*>* instructions,
                          intptr_t length);
 };
 
 
 class Code : public Object {
  public:
+  RawInstructions* active_instructions() const {
+    return raw_ptr()->active_instructions_;
+  }
+
   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_);
   }
 
+  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 {
-    ASSERT(raw_ptr()->entry_point_ ==
-           Instructions::Handle(instructions()).EntryPoint());
-    return raw_ptr()->entry_point_;
+    return Instructions::Handle(instructions()).EntryPoint();
   }
   intptr_t Size() const {
     const Instructions& instr = Instructions::Handle(instructions());
     return instr.size();
   }
   RawObjectPool* GetObjectPool() const {
-    const Instructions& instr = Instructions::Handle(instructions());
-    return instr.object_pool();
+    return object_pool();
   }
   bool ContainsInstructionAt(uword addr) const {
     const Instructions& instr = Instructions::Handle(instructions());
     const uword offset = addr - instr.EntryPoint();
     return offset < static_cast<uword>(instr.size());
   }
 
   // Returns true if there is a debugger breakpoint set in this code object.
   bool HasBreakpoint() const;
 
@@ skipping 174 matching lines @@
   int32_t GetPointerOffsetAt(int index) const {
     NoSafepointScope no_safepoint;
     return *PointerOffsetAddrAt(index);
   }
   intptr_t GetTokenIndexOfPC(uword pc) const;
 
   enum {
     kInvalidPc = -1
   };
 
-  // Returns 0 if code is not patchable
-  uword GetEntryPatchPc() const;
-  uword GetPatchCodePc() const;
-
   uword GetLazyDeoptPc() const;
 
   // Find pc, return 0 if not found.
   uword GetPcForDeoptId(intptr_t deopt_id, RawPcDescriptors::Kind kind) const;
   intptr_t GetDeoptIdForOsr(uword pc) const;
 
   RawString* Name() const;
   RawString* PrettyName() const;
 
   int64_t compile_timestamp() const {
     return raw_ptr()->compile_timestamp_;
   }
 
-  intptr_t entry_patch_pc_offset() const {
-    return raw_ptr()->entry_patch_pc_offset_;
-  }
-  void set_entry_patch_pc_offset(intptr_t pc) const {
-    StoreNonPointer(&raw_ptr()->entry_patch_pc_offset_, pc);
-  }
-
-
-  intptr_t patch_code_pc_offset() const {
-    return raw_ptr()->patch_code_pc_offset_;
-  }
-  void set_patch_code_pc_offset(intptr_t pc) const {
-    StoreNonPointer(&raw_ptr()->patch_code_pc_offset_, pc);
-  }
-
-
   intptr_t lazy_deopt_pc_offset() const {
     return raw_ptr()->lazy_deopt_pc_offset_;
   }
   void set_lazy_deopt_pc_offset(intptr_t pc) const {
     StoreNonPointer(&raw_ptr()->lazy_deopt_pc_offset_, pc);
   }
 
   bool IsAllocationStubCode() const;
   bool IsStubCode() const;
   bool IsFunctionCode() const;
 
  private:
   void set_state_bits(intptr_t bits) const;
 
+  void set_object_pool(RawObjectPool* object_pool) const {
+    StorePointer(&raw_ptr()->object_pool_, object_pool);
+  }
+
   friend class RawObject;  // For RawObject::SizeFromClass().
   friend class RawCode;
   enum {
     kOptimizedBit = 0,
     kAliveBit = 1,
     kPtrOffBit = 2,
     kPtrOffSize = 30,
   };
 
   class OptimizedBit : public BitField<bool, kOptimizedBit, 1> {};
   class AliveBit : public BitField<bool, kAliveBit, 1> {};
   class PtrOffBits : public BitField<intptr_t, kPtrOffBit, kPtrOffSize> {};
 
   // An object finder visitor interface.
   class FindRawCodeVisitor : public FindObjectVisitor {
    public:
     explicit FindRawCodeVisitor(uword pc)
         : FindObjectVisitor(Isolate::Current()), pc_(pc) { }
     virtual ~FindRawCodeVisitor() { }
 
-    virtual uword filter_addr() const { return pc_; }
-
     // Check if object matches find condition.
     virtual bool FindObject(RawObject* obj) const;
 
    private:
     const uword pc_;
 
     DISALLOW_COPY_AND_ASSIGN(FindRawCodeVisitor);
   };
 
   static bool IsOptimized(RawCode* code) {
     return Code::OptimizedBit::decode(code->ptr()->state_bits_);
   }
 
   static const intptr_t kEntrySize = sizeof(int32_t);  // NOLINT
 
   void set_compile_timestamp(int64_t timestamp) const {
     StoreNonPointer(&raw_ptr()->compile_timestamp_, timestamp);
   }
 
-  void set_instructions(RawInstructions* instructions) {
+  void set_active_instructions(RawInstructions* instructions) const {
     // RawInstructions are never allocated in New space and hence a
     // store buffer update is not needed here.
+    StorePointer(&raw_ptr()->active_instructions_, instructions);
+    StoreNonPointer(&raw_ptr()->entry_point_,
+                    reinterpret_cast<uword>(instructions->ptr()) +
+                    Instructions::HeaderSize());
+  }
+
+  void set_instructions(RawInstructions* instructions) const {
     StorePointer(&raw_ptr()->instructions_, instructions);
-    uword entry_point = reinterpret_cast<uword>(instructions->ptr()) +
-        Instructions::HeaderSize();
-    StoreNonPointer(&raw_ptr()->entry_point_, entry_point);
   }
 
   void set_pointer_offsets_length(intptr_t value) {
     // The number of fixups is limited to 1-billion.
     ASSERT(Utils::IsUint(30, value));
     set_state_bits(PtrOffBits::update(value, raw_ptr()->state_bits_));
   }
   int32_t* PointerOffsetAddrAt(int index) const {
     ASSERT(index >= 0);
     ASSERT(index < pointer_offsets_length());
@@ skipping 13 matching lines @@
 
   // New is a private method as RawInstruction and RawCode objects should
   // only be created using the Code::FinalizeCode method. This method creates
   // the RawInstruction and RawCode objects, sets up the pointer offsets
   // and links the two in a GC safe manner.
   static RawCode* New(intptr_t pointer_offsets_length);
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(Code, Object);
   friend class Class;
   friend class SnapshotWriter;
-
+  friend class CodePatcher;  // for set_instructions
   // So that the RawFunction pointer visitor can determine whether code the
   // function points to is optimized.
   friend class RawFunction;
 };
 
 
 class Context : public Object {
  public:
   RawContext* parent() const { return raw_ptr()->parent_; }
   void set_parent(const Context& parent) const {
@@ skipping 3669 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_