VM: New calling convention for generated code.

runtime/vm/raw_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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/globals.h"
@@ skipping 557 matching lines @@
   friend class ExternalTypedData;
   friend class ForwardList;
   friend class GrowableObjectArray;  // StorePointer
   friend class Heap;
   friend class HeapMapAsJSONVisitor;
   friend class ClassStatsVisitor;
   friend class MarkingVisitor;
   friend class Mint;
   friend class Object;
   friend class OneByteString;  // StoreSmi
+  friend class RawCode;
   friend class RawExternalTypedData;
   friend class RawInstructions;
   friend class RawInstance;
   friend class RawTypedData;
   friend class Scavenger;
   friend class ScavengerVisitor;
   friend class SizeExcludingClassVisitor;  // GetClassId
   friend class RetainingPathVisitor;  // GetClassId
   friend class SkippedCodeFunctions;  // StorePointer
   friend class InstructionsReader;  // tags_ check
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class String;
   friend class TypedData;
   friend class TypedDataView;
   friend class WeakProperty;  // StorePointer
   friend class Instance;  // StorePointer
+  friend class StackFrame;  // GetCodeObject assertion.
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(RawObject);
 };
 
 
 class RawClass : public RawObject {
  public:
   enum ClassFinalizedState {
     kAllocated = 0,  // Initial state.
@@ skipping 156 matching lines @@
   RawArray* parameter_names_;
   RawObject* data_;  // Additional data specific to the function kind.
   RawObject** to_snapshot() {
     return reinterpret_cast<RawObject**>(&ptr()->data_);
   }
   // Fields below are not part of the snapshot.
   RawArray* ic_data_array_;  // ICData of unoptimized code.
   RawObject** to_no_code() {
     return reinterpret_cast<RawObject**>(&ptr()->ic_data_array_);
   }
-  RawInstructions* instructions_;  // Instructions of currently active code.
+  RawCode* code_;  // Currently active code.
   RawCode* unoptimized_code_;  // Unoptimized code, keep it after optimization.
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->unoptimized_code_);
   }
   uword entry_point_;
 
   int32_t token_pos_;
   int32_t end_token_pos_;
   int32_t usage_counter_;  // Incremented while function is running.
   int16_t num_fixed_parameters_;
@@ skipping 209 matching lines @@
 class RawCode : public RawObject {
   enum InlinedMetadataIndex {
     kInlinedIntervalsIndex = 0,
     kInlinedIdToFunctionIndex = 1,
     kInlinedCallerIdMapIndex = 2,
     kInlinedMetadataSize = 3,
   };
 
   RAW_HEAP_OBJECT_IMPLEMENTATION(Code);
 
+  uword entry_point_;
+
   RawObject** from() {
-    return reinterpret_cast<RawObject**>(&ptr()->instructions_);
+    return reinterpret_cast<RawObject**>(&ptr()->active_instructions_);
   }
+  RawInstructions* active_instructions_;
   RawInstructions* instructions_;
+  RawObjectPool* object_pool_;
   // If owner_ is Function::null() the owner is a regular stub.
   // If owner_ is a Class the owner is the allocation stub for that class.
   // Else, owner_ is a regular Dart Function.
   RawObject* owner_;  // Function, Null, or a Class.
   RawExceptionHandlers* exception_handlers_;
   RawPcDescriptors* pc_descriptors_;
   RawArray* deopt_info_array_;
   RawArray* static_calls_target_table_;  // (code-offset, function, code).
   RawArray* stackmaps_;
   RawLocalVarDescriptors* var_descriptors_;
   RawArray* inlined_metadata_;
   RawArray* comments_;
   // If return_address_metadata_ is a Smi, it is the offset to the prologue.
   // Else, return_address_metadata_ is null.
   RawObject* return_address_metadata_;
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->return_address_metadata_);
   }
-  uword entry_point_;
 
   // Compilation timestamp.
   int64_t compile_timestamp_;
 
   // state_bits_ is a bitfield with three fields:
   // The optimized bit, the alive bit, and a count of the number of pointer
   // offsets.
   // Alive: If true, the embedded object pointers will be visited during GC.
   int32_t state_bits_;
 
   // PC offsets for code patching.
-  int32_t entry_patch_pc_offset_;
-  int32_t patch_code_pc_offset_;
   int32_t lazy_deopt_pc_offset_;
 
   // Variable length data follows here.
   int32_t* data() { OPEN_ARRAY_START(int32_t, int32_t); }
   const int32_t* data() const { OPEN_ARRAY_START(int32_t, int32_t); }
 
+  static bool ContainsPC(RawObject* raw_obj, uword pc);
+
   friend class Function;
   friend class MarkingVisitor;
   friend class SkippedCodeFunctions;
   friend class StackFrame;
 };
 
 
 class RawObjectPool : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(ObjectPool);
 
@@ skipping 12 matching lines @@
   Entry* first_entry() { return &ptr()->data()[0]; }
 
   friend class Object;
   friend class SnapshotReader;
 };
 
 
 class RawInstructions : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Instructions);
 
-  RawObject** from() {
-    return reinterpret_cast<RawObject**>(&ptr()->code_);
-  }
-  RawCode* code_;
-  RawObjectPool* object_pool_;
-  RawObject** to() {
-    return reinterpret_cast<RawObject**>(&ptr()->object_pool_);
-  }
   int32_t size_;
 
   // Variable length data follows here.
   uint8_t* data() { OPEN_ARRAY_START(uint8_t, uint8_t); }
 
   // Private helper function used while visiting stack frames. The
   // code which iterates over dart frames is also called during GC and
   // is not allowed to create handles.
-  static bool ContainsPC(RawObject* raw_obj, uword pc);
+  static bool ContainsPC(RawInstructions* raw_instr, uword pc);
 
   friend class RawCode;
   friend class RawFunction;
   friend class Code;
   friend class StackFrame;
   friend class MarkingVisitor;
   friend class SkippedCodeFunctions;
   friend class Function;
   friend class InstructionsReader;
 };
@@ skipping 1122 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_