VM: New calling convention for generated code.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 7f2fb04b4894eb57542dc69ed7729fe9a2f01672..7c2a807b668929f9158eec4f4d14d6951ff21a01 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -2163,13 +2163,17 @@ class Function : public Object {
   // 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_);
   }
@@ -3707,14 +3711,6 @@ class ObjectPool : public Object {
 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();
@@ -3753,12 +3749,6 @@ class Instructions : public Object {
   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
@@ -4091,12 +4081,25 @@ class DeoptInfo : public AllStatic {
 
 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_);
   }
@@ -4111,17 +4114,14 @@ class Code : public Object {
   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());
@@ -4316,10 +4316,6 @@ class Code : public Object {
     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.
@@ -4333,22 +4329,6 @@ class Code : public Object {
     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_;
   }
@@ -4363,6 +4343,10 @@ class Code : public Object {
  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 {
@@ -4383,8 +4367,6 @@ class Code : public Object {
         : 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;
 
@@ -4404,13 +4386,17 @@ class Code : public Object {
     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) {
@@ -4444,7 +4430,7 @@ class Code : public Object {
   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;