[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/arm/frames-arm.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 58 matching lines @@
   1 <<  7 |  //  r7 v4
   1 <<  8 |  //  r8 v5 (cp in JavaScript code)
   kR9Available
     <<  9 |  //  r9 v6
   1 << 10 |  // r10 v7
   1 << 11;   // r11 v8 (fp in JavaScript code)
 
 static const int kNumCalleeSaved = 7 + kR9Available;
 
 
+// Number of registers for which space is reserved in safepoints. Must be a
+// multiple of 8.
+// TODO(regis): Only 8 registers may actually be sufficient. Revisit.
+static const int kNumSafepointRegisters = 16;
+
+// Define the list of registers actually saved at safepoints.
+// Note that the number of saved registers may be smaller than the reserved
+// space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
+static const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved;
+static const int kNumSafepointSavedRegisters =
+    kNumJSCallerSaved + kNumCalleeSaved;
+
 // ----------------------------------------------------
 
 
 class StackHandlerConstants : public AllStatic {
  public:
   static const int kNextOffset  = 0 * kPointerSize;
   static const int kStateOffset = 1 * kPointerSize;
   static const int kFPOffset    = 2 * kPointerSize;
   static const int kPCOffset    = 3 * kPointerSize;
 
   static const int kSize = kPCOffset + kPointerSize;
 };
 
 
 class EntryFrameConstants : public AllStatic {
  public:
   static const int kCallerFPOffset      = -3 * kPointerSize;
 };
 
 
 class ExitFrameConstants : public AllStatic {
  public:
   static const int kCodeOffset = -1 * kPointerSize;
   static const int kSPOffset = -1 * kPointerSize;
 
-  static const int kSavedRegistersOffset = 0 * kPointerSize;
+  // TODO(regis): Use a patched sp value on the stack instead.
+  // A marker of 0 indicates that double registers are saved.
+  static const int kMarkerOffset = -2 * kPointerSize;
 
   // The caller fields are below the frame pointer on the stack.
   static const int kCallerFPOffset = +0 * kPointerSize;
   // The calling JS function is between FP and PC.
   static const int kCallerPCOffset = +2 * kPointerSize;
 
   // FP-relative displacement of the caller's SP.  It points just
   // below the saved PC.
   static const int kCallerSPDisplacement = +3 * kPointerSize;
 };
@@ skipping 37 matching lines @@
 
 inline Object* JavaScriptFrame::function_slot_object() const {
   const int offset = JavaScriptFrameConstants::kFunctionOffset;
   return Memory::Object_at(fp() + offset);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_FRAMES_ARM_H_